MGE GALAXY STS - Installation & User Manual

51027406XT/AD -

Installation and usermanual

Galaxy STS30A - 600A

Static TransferSwitch

www.mgeups.com MGE UPS SYSTEMS

TH

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P R O V I D E R

STATIC TRANSFER SWITCH

SOURCE 1

SOURCE 2

LOAD / CHARGE

AUTO RETRANSFERT

FAULT

LAMP TEST

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Introduction

As standards, specifications and design change from time to time, please ask for confirmation of the information given in this publication.

Reproduction of this document subject to prior authorization by MGE UPS SYSTEMS and with the mandatory indication:

"Galaxy STS installation and user manual n° 51027406XT".

Thank you for selecting an MGE UPS SYSTEMS product to protect your electrical equipment.

The Galaxy STS (Static Transfer Switch) has been designed with the upmost care. We recommend that you take the time

to read this manual to take full advantage of the many features of your new equipment.

MGE UPS SYSTEMS pays great attention to the environmental impact of its products. Measures that have made Galaxy

STS a reference in environmental protection include:

◗ the eco-design approach used in product development,

◗ recycling of Galaxy STS at the end of its service life.

To discover the entire range of MGE UPS SYSTEMS products and the options available for the Upsilon STS, we invite

you to visit our web site at www.mgeups.com or contact your MGE UPS SYSTEMS representative.

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MGE UPS SYSTEMS Static Transfer Switches (STS) are reliable and safe. Integrated components protect the equipment

from damage likely to cause a fault. Operating and maintenance procedures must be carried out exclusively by qualified

personnel, trained by MGE UPS SYSTEMS. The personnel involved in equipment operation and maintenance must have

received suitable training to ensure a maximum degree of safety and performance.

Caution: operating and maintenance procedures or instructions must be respected to avoid the risk of

endangering persons or damaging the equipment.

Warning: operation outside the limits indicated in Chapter 7 or non-observance of the procedures presented in Chapter 3

may be detrimental to Galaxy STS reliability.

Safety

Electrical-safety recommendations

The Galaxy STS must be considered energized unless all power sources have been cut and a check has been run using a

separate measurement device to confirm that no circuit is live. Otherwise, the maintenance procedures must be followed to

ensure safety (Chapter 6).

Warning: the Galaxy STS must be considered energized unless a check has been run to ensure that the source 1, source

2 and output isolation switches are open. The normal or maintenance bypass switches may be closed to supply the load.

We recommend that you call on our after-sales support department to carry out these operations.

Caution: operation of Galaxy STS requires that there be only one key to lock the two bypasses (Q1BP and Q2BP).

Otherwise, the installation may be damaged. MGE UPS SYSTEMS declines any responsibility if the above rule is

not observed.

Recommendations:

◗ Do not install Galaxy STS in or near a very damp environment.

◗ Never block the ventilation grates of Galaxy STS cubicles.

System earthing: Galaxy STS is suitable for any system earthing arrangement, arrangement except the IT and TT

system.

Operated by only personnel authorised to enter restricted access locations.

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Foreword

Important instructions that must be followed

Information, advice, help

Visual indication

Action

Pictograms used in this manual

Earth cables

Other cables

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1. General .......................................................................................................................... 6

1.1 Operation principle .......................................................................................................................... 6

1.2 General diagram............................................................................................................................... 7

1.3 Description ....................................................................................................................................... 7

2. Installation .................................................................................................................... 8

2.1 Positioning ....................................................................................................................................... 8

2.2 Inspection ......................................................................................................................................... 8

2.3 Connections ..................................................................................................................................... 9

2.4 Cable cross-sections ..................................................................................................................... 13

2.5 Recommended protection ............................................................................................................. 13

2.6 Connection diagram ...................................................................................................................... 14

3. start-up and shut-down ............................................................................................. 15

3.1 Start-up ........................................................................................................................................... 15

3.2 Shut-down ...................................................................................................................................... 15

3.3 Complete shut-down ..................................................................................................................... 15

3.4 Manual transfer .............................................................................................................................. 15

3.5 Bypass ............................................................................................................................................ 16

4. operation ..................................................................................................................... 17

4.1 General ............................................................................................................................................ 17

4.2 Controls and leds ........................................................................................................................... 17

5. Description of the Galaxy STS .................................................................................. 19

5.1 General description ....................................................................................................................... 19

5.2 Troubleshooting ............................................................................................................................. 23

6. Maintenance ............................................................................................................... 25

6.1 General ............................................................................................................................................ 25

6.2 Safety recommendations .............................................................................................................. 25

6.3 Preventive maintenance ................................................................................................................ 25

7. characteristics ............................................................................................................ 26

7.1 Electrical characteristics ............................................................................................................... 26

7.2 General characteristics ................................................................................................................. 26

7.3 Mechanical characteristics ........................................................................................................... 27

7.4 Customization ................................................................................................................................ 27

7.5 Fuse characteristics ...................................................................................................................... 27

7.6 Losses ............................................................................................................................................. 28

7.7 Electromagnetic-compatibility standards ................................................................................... 28

8. Appendix ..................................................................................................................... 29

8.1 List of the figures in the manual ................................................................................................... 29

8.2 List of the tables in the manual .................................................................................................... 29

Contents

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1. General

1.1 Operation principle

Galaxy STS principle

Galaxy STS is a product allowing seamless automatic or manual transfer of one or more 3-phase loads from one power

source (known as the Preferred source) to another power source (known as the Alternate source).

Transfer is automatic if the Preferred source fails.

Operating symmetry between the sources

The architecture and operation of Galaxy STS is completely symmetrical, i.e. it is possible to select Source 1 as either the

Preferred source (with Source 2 as the Alternate source) or the Source 2 (with Source 1 as the Alternate source), and

modify this order at any time.

Reversibility of transfers

Depending on installation operating conditions and the system configuration, Galaxy STS also allows automatic reverse

transfer (return from the Alternate source to the Preferred source).

Control and reliability of transfers

The switching technology used is of the “Break Before Make” type (no source overlap), ensuring that during a transfer,

both supply sources are never parallel-connected at any time. This:

◗ enables transfers between sources of different types, impedances, voltage levels, frequencies and phases;

◗ prevents propagation of faults, thereby eliminating a possible single-point failure mode.

Operation with all types of sources

The power sources can be of any type (utility, UPS, generator set).

However, to ensure proper operation of the power supply system as a whole (sources, Galaxy STS, loads), sources must

normally be balanced as regards voltage, synchronized and in phase, either naturally or by means of a specific

synchronization device (installed at source level).

Figure 1: Simplified diagram of Galaxy STS

Source 1preferred(or alternate)

Source 2alternate(or preferred)

AC input 1 AC input 2

Circuit-breaker 1 Circuit-breaker 2

Galaxy STS

Control unit

Q1 Q2

Q1BP Q2BP

SSpath 1

SSpath 2

Q3

Load

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1.2 General diagram

1. General

Figure 2: Typical diagram of a Galaxy STS installation

1.3 Description

Fully solid-state technology

Galaxy STS consists of two three-phase static switches, one on the Source 1 path, the other on the Source 2 path. Each

static switch (SS) is made up of 3 pairs of back-to-back Silicon Controlled Rectifiers (SCR). The neutral conductor is not

switched.

Mounted in a standard cubicle

The static switches, switches and electronic control unit are mounted in a standard MGE UPS SYSTEMS cubicle. The

dimensions vary according to the rating.

Easy to operate and maintain

◗ On the front panel, a complete mimic panel groups the control devices and displays the various status conditions of the

sources and loads.

◗ To allow maintenance and troubleshooting, the Galaxy STS is equipped with 3 switches for isolation of the static switches

as well as 2 bypass switches, provided with an interlocking device, for bypassing the static switches. The switches are

accessed from the front of the cubicle.

Main LVswitchboard 1

Buildingor zone 1 Gen

Source HQ 1

Secondary LVswitchboard 1

Load 1

STS 1

Buildingor zone 2

Source HQ 2

Secondary LVswitchboard 2

Load 2

STS 2

STS 3

Main LVswitchboard 2

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2. Installation

2.1 Positioning

Note : for 30 A, 50 A and 100 A Galaxy STS cubicles, a clearance of 35 centimeters is required behind the cubicle for

access by maintenance personnel.

2.2 Inspection

Before installing Galaxy STS, carry out a complete visual inspection:

◗ Fully inspect the cubicle, ventilation grates and the doors for any damage that may have occurred during transport.

◗ Open the cubicle doors and check each component, as well as the system as a whole.

◗ Check all the locking devices.

◗ Remove the adhesive tape and any remaining packing materials.

◗ Make sure that any drawout modules are fully inserted.

◗ Check that all markings and text on the cubicle, the device and components are clearly legible.

◗ Check that no lights or switches were damaged during transport, and that all connections and locking systems are

correctly tightened.

◗ Immediately inform MGE UPS SYSTEMS of any damage or apparent defects concerning the cubicle or the equipment.

Side viewof30A,50Aand 100AGalaxy STScubicles

35 cm

72 cm35 cm

Side viewof160A,550A,400Aand 600AGalaxy STScubicles

35 cm

72 cm0 cm

FrontBack FrontBack

The Galaxy STS is designed to be installed on the floor.

Figure 3: Space to reserve arround the Galaxy STS cubicles

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2. Installation

2.3 ConnectionsOnce the Galaxy STS has been correctly positioned and inspected, it can be connected to the power sources. All cables

enter at the bottom of the Galaxy STS (see figures 5, 6 and 7).

Galaxy STS legs are 40 mm in diameter. Their height is adjustable (recommended height = 100 mm).

There are two communications ports on the INTY remote indications card of the Galaxy STS:

◗ one RS 485 port,

◗ and a terminal block with remote-indication input/outputs (isolated dry contacts).

A description of port characteristics and functions is provided in section 5.1.

See Table 7 and 8 for information on the signals on each terminal of the INTY card.

Figure 4: Terminals on the INTY card

XM

2M

OD

U (

4 p

ts)

RS485 port

9 8

7 6

5 4

3 2

110

Preffered source 1CommonPreffered source 2Auto return ONCommonAuto return OFFLoad ONCommonLoad OFF

Wiring diagram for the closing dry contacts to signal a generalGalaxy STS fault and a source fault.

CommonNot used

Transfert inhibitAuto return OFFAuto return ONSource 2Source 1Remove fault reset

9 8

7 6

5 4

3 2

110

Source 2 ONCommonSource 2 OFFSource 1 ONCommonSource 1 OFFPhase faultCommonGood phaseStatus Source 2 (red)CommonStatus Source 2 (not red)

9 8

7 6

5 4

3 2

110

119

8 7

6 5

4 3

2 1

1011

1212

Status Source 2 (orange)CommonStatus Source 2 (not orange)Status Source 1 (red)CommonStatus Source 1 (not red)Status Source 1 (orange)CommonStatus Source 1 (not orange)Not global alarmCommonGlobal alarm

Typ

e S

UB

-D(9

pts

)X

M1

0

This represents a general fault covering all the conditions monitoredby Galaxy STS.

Wiring diagram for the opening dry contactsto signal a generalGalaxy STS fault and a source fault.

This represents a general fault covering all the conditions monitoredby Galaxy STS.

INTY board

INTY board

XM9 10

XM9 9

XM7 10

XM7 11

XM6 4

XM6 5

XM6 12

XM6 11

XM9 9

XM9 10

XM7 11

XM7 12

XM6 5

XM6 6

XM6 11

XM6 12

XM

9

XM

8

XM

7X

M6

INT

Y b

oard

XM

1ty

pe

HE

10

(50

pts

)

12

34

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2. Installation

Figure 5: Internal view of Galaxy STS 30 A, 50 A and 100 A

Height of connections measured from floor:

◗ Source 1: 390 mm

◗ Load: 390 mm


◗ Remote-indications card: 1080 mm

Connection to screw terminals.

Maximum cross-section: 50 mm2.

LEM6

LEM4

LEM5

LEM3

LEM2

LEM1

LEM12

LEM10

LEM11

LEM9

LEM8

LEM7

Q7Q6

X4-2X4-1

R1 C1F7 F8 C2 R2

F1 F2 F3

ALMY

Q4 Q5F4 F5 F6

Q1Q1BP Q3 Q2BP

Q2

N L1 L2 L3 N L1 L2 L3 N L1 L2 L3

So

urc

e 1

Lo

ad

So

urc

e 2

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2. Installation

Figure 6: Internal view of Galaxy STS 160A and 250A


◗ Source 1: 340 mm.

◗ Load: 340 mm.

◗ Source 2: 340 mm.

◗ Remote-indications card: 1430 mm.

Connection to 25 x 5 mm copper bars, holes Ø10,5 mm.

LEM3 LEM1

LEM2

LEM5

LEM4LEM6

Connection via the top possible

X4-1 X4-2

Q6Q7

F2 F2 F2

A B C

F1 F1 F1

A B C

ALMY

Q1 Q2

Q1BP Q3 Q2BP

N L1 L2 L3 N L1 L2 L3 N L1 L2 L3

So

urc

e 1

Lo

ad

So

urc

e 2

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2. Installation

Figure 7: Internal view of Galaxy STS 400A and 600A



◗ Load: 450 mm


◗ Remote-indications card: 1480 mm

Connection to copper bars, 3 holes Ø12,5 mm.

LEM1

LEM2

LEM3

LEM4

LEM5

LEM6

LEM7

LEM8

LEM9

LEM10

LEM11

LEM12

X4-1 X4-2Q5 F8 Q7F8

Q4Q6ALMY

F1

F2

F3

Q1 Q2

F6

F5

F4

N L1 L2 L3 N L1 L2 L3 N L1 L2 L3

Q2BPQ1BP Q3

So

urc

e 1

Lo

ad

So

urc

e 2

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2. Installation

2.4 Cable cross-sectionsThe cable cross-sections indicated below are calculated for a rated interphase voltage of 400 V and rated load currents.

The information is purely indicative in nature and does not engage the responsibility of MGE UPS SYSTEMS.

Table 1: Cable cross-sections

2.5 Recommended ProtectionThe protective devices must comply with applicable standards. They should be selected using the information presented

below and taking into account discrimination requirements. The information is purely indicative in nature and does not

engage the responsibility of MGE UPS SYSTEMS.

Protection for a TNS system

Galaxy STS

30A

50A

100A

160A

250A

400A

600A

AC-source current

30

50

100

160

250

400

600

Recommended Cu cable cross-sections in mm2

16

35

50

70

120

2 x 95

2 x 120

Table 2: Protection for a TNS system

Galaxy STS

30A

50A

50A

100A

160A

160A

250A

400A

400A

600A

Imax phase

30

50

50

100

160

160

250

400

400

600

Imax neutral

30

50

75

100

160

240

250

400

600

600

Im setting

-

10xIn

10xIn

10xIn

10xIn

10xIn

10xIn

10xIn

10xIn

10xIn

Type of circuit breaker

C60L 32A

NS100H 4P 4D

NS100H 4P 4D

NS100H 4P 4D

NS160H 4P 4D

NS250N 4P 4D

NS250N 4P 4D

NS400H 4P 4D

NS630N 4P 4D

NS630N 4P 4D

Trip unit

courbe C

STR22SE

STR22SE

STR22SE

STR22SE

STR22SE

STR22SE

STR22SE

STR22SE

STR22SE

Protection for a TNC system

Galaxy STS

50A

100A

250A

400A

600A

Imax phase

50

100

250

400

600

Imax neutral

50

100

250

400

600

Im setting

10xIn

10xIn

10xIn

10xIn

10xIn

Type of circuit breaker

NS100H 3P

NS100H 3P

NS250H 3P

NS400H 3P

NS630H 3P

Trip unit

STR22SE

STR22SE

STR22SE

STR22SE

STR22SE

Table 3: Protection for a TNC system

The cross-sections for aluminum cables must be increased 30% with respect to the figures for copper cables. Calculations

take into account voltage drops in cables 100 meters long.

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2. Installation

2.6 Connection diagram

Figure 8: Typical connection diagram for a Galaxy STS on TNS systems

TNC system

Figure 9: Typical connection diagram for a Galaxy STS on TNC systems

TNS system

F2

F3

Q1 Q2F5

F4

Q2BPQ1BP Q3

So

urc

e 1

Lo

ad

So

urc

e 2

N L1 L2 L3 N L1 L2 L3 N L1 L2 L3

Cable ties Cable ties

F2

F3

Q1 Q2F5

F4

Q2BPQ1BP Q3

So

urc

e 1

Lo

ad

So

urc

e 2

N L1 L2 L3 N L1 L2 L3 N L1 L2 L3

Cable ties Cable ties

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3. Start-up and shut-down

3.1 Start-upThe following procedure indicates how to energize the load using Source 1. If the load is to be supplied preferably by

Source 2, simply replace the indicated commands and indication LEDs with those for Source 2 in the procedure presented

below.

See Figure 10 to locate the commands and indication LEDs in the procedure presented below. Each number in brackets

corresponds to a number in Figure 10.

◗ Check that the Source 1 and Source 2 inputs are supplied with power.

◗ Check that all loads are de-energized.

◗ Check that Q1BP and Q2BP are open.

◗ Close switches Q4 and Q6 and check that LEDs on the card go on.

◗ Close Source 1 isolation switch Q1 (22) and check that the U 1 (1) and SS 1 ACTIVE (2) LEDs are green.

◗ Close Source 2 isolation switch Q2 (25) and check that the U 2 (7) LED is green.

◗ Close switch Q3 (23) and check that the SS 1 ACTIVE (2) and LOAD (6) LEDs are green. The load is now supplied by

Source 1.

◗ If the Source 1 input voltage is unacceptable and Source 2 input power is available and OK (or downgraded), GALAXY

STS automatically switches to Source 2.

3.2 Shut-down

3.3 Complete shut-downCaution: this procedure will interrupt the supply of power to the load.

In an emergency, it is possible to shut down the Galaxy STS by opening all the switches (numbered 21 to 25).

Warning: dangerous voltages are still present in the lower part of the cubicle. Proceed as follows to completely de-

energize the system.

◗ Open the Source 1 and Source 2 upstream circuit breakers (upstream of Galaxy STS).

◗ Check that all the indication LEDs are OFF.

3.4 Manual transferThe load may be transferred from one source to another as indicated below:

Transfer from Source 1 to Source 2:

◗ Check that the U 2 (7) LED is green. If not, re-establish the supply of power at the Source 2 input.

◗ Press simultaneously the KEY (11) button and the SOURCE 2 selection button (10). The SS 2 ACTIVE (8) and S2

PREFERRED (9) indications LEDs should go green. The SS 1 ACTIVE (2) and S1 PREFERRED (3) indication LEDs

should go off.

Remark: if the S1/S2 phase-condition (5) button is red, transfer is disabled. However, Source 2 nonetheless replaces

Source 1 as the preferred source. If AUTO RETRANSFER is enabled, Galaxy STS transfers the load (following the

programmed time delay) as soon as the S1/S2 phase-condition (5) button goes off.

Transfer from Source 2 to Source 1:

◗ Check that the U 1 (1) LED is green. If not, re-establish the supply of power at the Source 1 input.

◗ Press simultaneously the KEY (11) button and the SOURCE 1 selection button (4). The SS 1 ACTIVE (2) and S1

PREFERRED (3) indications LEDs should go green. The SS 2 ACTIVE (8) and S2 PREFERRED (9) indication LEDs

should go off.

Remark: if the S1/S2 phase-condition (5) button is red, transfer is disabled. However, Source 1 nonetheless replaces

Source 2 as the preferred source. If AUTO RETRANSFER is enabled, Galaxy STS transfers the load (following the

programmed time delay) as soon as the S1/S2 phase-condition (5) button goes off.

The shutdown procedure for normal maintenance consists in transferring the load to the Source 1 or Source 2 bypass (see

section 3.5). However, if total de-energizing is required, follow the procedure indicated in section 3.3.

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3.5 By-pass

3. Start-up and shut-down

It is possible to bypass the Galaxy STS for maintenance without interrupting the supply of power to the load which may be

supplied via either Source 1 or Source 2.

Bypass of Source 1:

◗ Check that the Galaxy STS supplies Source 1 power to the load. The SS 1 ACTIVE (2) and LOAD (6) indication LEDs

should be green.

◗ Open the Source 2 isolation switch Q2 (25). The U2 (7) LED should go red.

◗ Close the Source 1 bypass switch Q1BP (21). The U2 (7) LED should flash red indicating that the control electronics

inhibit a transfer to Source 2.

◗ Open the Source 1 isolation switch (22). The U1 (1) LED should go red.

◗ Open the load switch Q3 (23). The LOAD (6) LED should remain green.

◗ The load is supplied by Source 1 and Galaxy STS is isolated from Source 1, Source 2 and the load.

◗ Open the circuit breakers (Q4 and Q6) on the front panel of the Galaxy STS to de-energize the electronic cards.

Warning: dangerous voltages are still present in the cubicle. Observe all safety recommendations.

Bypass of Source 2:

◗ Check that the Galaxy STS supplies Source 1 power to the load. The SS 2 ACTIVE (8) and LOAD (6) indication LEDs

should be green.

◗ Open the Source 1 isolation switch Q2 (22). The U1 (1) LED should go red.

◗ Close the Source 2 bypass switch Q2BP (24). The U1 (1) LED should FLASH red indicating that the control electronics

inhibit a transfer to Source 1.

◗ Open the Source 2 isolation switch (25). The U2 (7) LED should go red.

◗ Open the load switch Q3 (23). The LOAD (6) LED should remain green.

◗ The load is supplied by Source 2 and Galaxy STS is isolated from Source 1, Source 2 and the load.

◗ Open the circuit breakers (Q4 and Q6) on the front panel of the Galaxy STS to de-energize the electronic cards.

Warning: dangerous voltages are still present in the cubicle. Observe all safety recommendations.

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4.1 General

4. Operation

This chapter describes all Galaxy STS commands and indication LEDs as well as the required operating procedures.

The operating instructions contained in this manual concern exclusively the Galaxy STS, viewed as a separate and

autonomous device. In that the Galaxy STS is generally a component in an overall system intended to protect the supply of

power to the load, the user must consult the operating instructions for the overall system for information on the operating

sequences and procedures of the other components and the system as a whole.

Warning: any contact with input or output power conductors represents a major risk for the safety of the

concerned persons. Observe all standard precautions during work with the system energized. Check that all the

ground connections have been made. Operation and maintenance of this equipment require a high level of

attention and care. Follow all the general safety recommendations provided in chapter 1 of this manual.

4.2 Controls and LEDs

Figure 10 : Mimic panel with controls and indication LEDs

All controls are located on the front panel. The actual switches are located behind the front door. Figure 10 shows the

controls and indication LEDs with identification numbers. Table 4 to 6 provide the name and a definition for each control

and indication LED according to the numbers.

STATIC TRANSFER SWITCH

SOURCE 1 SOURCE 25

4

3

22

1

2

21

23

6

14

Q1BP

Q1

U1

LOAD / CHARGE

10

9

25

7

8

24Q2BP

Q2

U2

Q3

15

18

11 12 19 13 16 17

AUTO RETRANSFER

ON OFF

fault LAMPTEST

Ø

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4. Operation

Table 4 : Description of the indication LEDs

(*): A flashing red LED indicates that the Galaxy STS cannot transfer the load to the source in question, due to a control-

logic interdiction, for example in the event of an overload or a command inhibiting transfer.

No

21

22

23

24

25

Name of switches

Switch Q1BP

Switch Q1

Switch Q3

Switch Q2BP

Switch Q2

Description

Connects/disconnects Source 1 to the load, bypassing the

static-switch module.

Connects/disconnects Source 1 to the static-switch module.

Connects/disconnects the load to the static-switch module.

Connects/disconnects Source 2 to the load, bypassing the

static-switch module.

Connects/disconnects Source 2 to the static-switch module.

No

1

2

3

5

6

7

8

9

14

15

18

Name of LEDs

U 1

(SOURCE 1 VOLTAGE PRESENT)

SS 1 ACTIVE

S1 PREFERRED

S1/S2 PHASE DISPLACEMENT

LOAD

U 2

(SOURCE 2 VOLTAGE PRESENT)

SS 2 ACTIVE

S2 PREFERRED

AUTO RETRANSFER ON

AUTO RETRANSFER OFF

ALARM

Description

GREEN: indicates that the source 1 is OK,

ORANGE: indicates that the source 1 is downgraded,

RED: indicates that the source 1 is unacceptable(*).

GREEN: the SCRs on the Source 1 side are on.

GREEN: Source 1 is selected as the preferred source.

RED: the phase displacement between the two sources is

greater than the admissible value.

GREEN: the load is supplied with power.

GREEN: indicates that the source 2 is OK,

ORANGE : indicates that the source 2 is downgraded

RED: indicates that the source is unacceptable(*).

GREEN: the SCRs on the Source 2 side are on.

GREEN: Source 2 is selected as the preferred source.

Lit if the auto retransfer mode is enabled.

Lit if the auto retransfer mode is disabled.

Lights if an internal Galaxy STS fault occurs. The following faults

result in an alarm: fuse blown, open SCR, shorted SCR,

temperature fault, ventilation fault and other internal faults, such

as control-logic or power supply failures.

No

4

10

11

12

13

16

17

19

Name of pushbuttons

SOURCE 1 PREFERRED

SOURCE 2 PREFERRED

KEY

FAULT RESET

AUTO RETRANSFER ON

AUTO RETRANSFER OFF

LAMP TEST

ALARM RESET

Description

Press this button and the KEY (11) button simultaneously to

select Source 1 as the preferred source. This action results in

transfer of the load to Source 1 if transfer conditions are

satisfied.


select Source 2 as the preferred source. This action results in

transfer of the load to Source 2 if transfer conditions are

satisfied.

Press this button simultaneously with the SOURCE 1

PREFERRED, FAULT RESET, AUTO RETRANSFER ON/OFF

and SOURCE 2 PREFERRED buttons (numbered 4, 12, 13, 16

and 10).


clear the lockout caused by an overload associated with

“Undervoltage 30” detection.


enable automatic transfer back to the preferred source.


disable automatic transfer back to the preferred source.

This button causes all the LEDs on the front panel to light.

Press this button to deactivate the buzzer.

Table 5 : Description of pushbuttons

Table 6 : Isolation and bypass switches

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5. Description of the STS

5.1 General descriptionThe Static Transfer Switch Galaxy STS is a dual path, three-phase static source-changeover system used to connect a

three-phase load at the output to one of the two three-phase power sources connected to the input.

The two input power sources are called Source 1 and Source 2.

The source to which the load is connected during normal operation is called the preferred source.

Transfer conditions and modes

Transfer conditions

The electronic control and monitoring unit permanently carries out the following checks (transfer conditions):

◗ source voltages (Preferred and Alternate) are present and levels within the authorized (factory adjustable) tolerances;

◗ phase angle between the Preferred source voltages and the Alternate source voltages is within the authorized (factory

adjustable) tolerances;

◗ absence of overload or downstream short-circuit.

A transfer sequence can be initialized automatically on detection of a problem (tolerance overrun) on the Preferred source,

or manually (by the operator).

Monitoring power-supply sources

The two upstream sources are permanently monitored, phase by phase, for overvoltage and undervoltage. All the detection

thresholds, and the hysteresis values, can be adapted when configuring the unit.

There are two levels of undervoltage detection thresholds:

◗ a threshold referred to as "Undervoltage 30", factory adjustable, beyond which the source is declared to be unacceptable.

◗ an intermediate threshold, referred to as "Undervoltage 10", factory adjustable, below which the source is declared to be

downgraded but acceptable.

Depending on the status of the two sources, the Galaxy STS chooses the best source to supply the load. This leads to a

transfer to the Alternate source under the following conditions:

◗ when the Preferred source becomes unacceptable and the Alternate source is either OK or downgraded.

◗ when the Preferred source becomes downgraded and the Alternate source is OK.

The frequency of the supply sources is also monitored. If the frequency goes outside the tolerance limits, the source is also

declared to be downgraded.

Transfer modes

If the transfer conditions are satisfied, the transfer is performed instantly by deactivating the active SS (Preferred path) and

activating the SS for the Alternate path. The transfer is performed by a "no overlap" technique (Break before Make) that

monitors, phase by phase, extinction of the SCRs of the SS to be disconnected before controlling the SCRs of the SS to be

triggered. This principle ensures that the two sources are not connected in parallel at any time during the transfer. It also

ensures:

◗ proper operation of Galaxy STS regardless of the impedance and nature of the power sources (utility, generator sets,

Uninterruptible Power Supplies of different power ratings and technologies, etc.).

◗ that a fault on the Preferred source (for example a short-circuit upstream of the STS) is not transferred to the Alternate

source, which would bring it down by tripping its protective devices.

Transfer times

The transfer time is defined as the total length of time between the occurrence of the event initializing the transfer and the

moment when the three phases of the load are fully switched to the Alternate source.

Under normal operating conditions (sources synchronized before the event) and when supplying computer type or slightly

inductive loads, the transfer time is less than 2 ms. This value may be exceeded (typically up to 5 ms at most) for certain

installations and faults such as a solid short-circuit on the Preferred source line upstream of a GALAXY STS with a highly

inductive load.

Transfer with out-of-phase sources

If the phase condition between Preferred source and Alternate source voltages is not respected (phase angle outside

authorized tolerances), the transfer can be carried out in either of the following two ways:

◗ with a voluntary load supply interruption lasting a few cycles (factory adjustable duration)

◗ instantly without taking the phase deviation into account.

The choice between these two methods is made by the operator during configuration of the unit depending on whether or

not the load can handle the phase deviation.

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Disabled transfers

Transfer disabled in the event of a downstream fault

If an overload or downstream short-circuit is detected, the transfer function is disabled.

Voluntary transfer inhibit

An input intended for connection to a volt-free remote control contact is used to lock out transfers of any kind. This function

is used in particular for installations comprising a number of Galaxy STSs with a single Alternate source possessing a

lower power rating than the total installed power. As soon as one Galaxy STS transfers its load to the Alternate source,

transfer is inhibited on all the other Galaxy STSs to avoid overloading the Alternate source.

Transfer back to the Preferred source

Manual or automatic retransfer

After a transfer to the Alternate source, due to a problem on the Preferred source, and on re-establishment of the Preferred

source power within the specified tolerances, the return transfer of the load to the Preferred source may take place in one

of two ways (selected by the operator during configuration of the unit):

◗ manually (automatic retransfer disabled) using the button on the control panel.

◗ automatically, after monitoring the correct status of the Preferred source for a pre-set length of time (automatic retransfer

enabled).

"Rolling Synch" sequence in manual mode

In manual mode, it is possible to retransfer even if the sources are desynchronized and slipping with respect to one

another, using a "Rolling Synch" type sequence (transfer at the moment when the zero crossover of the two voltage waves

coincides).

Selection of Preferred and Alternate sources

The connection terminals of the 2 sources are marked "Source 1" and "Source 2".

In that the architecture and operation of Galaxy STS is completely symmetrical, it is possible to select Source 1 as either

the Preferred source (with Source 2 = Alternate) or the Alternate source (with Source 2 = Preferred), indifferently. Selection

takes place:

◗ either locally via the control panel;

◗ or remotely via the remote control features described in section 3.

Remote I/O port

The Galaxy STS has two different communications ports:

◗ an RS 485 port,

◗ and a terminal block with remote-indication input/outputs (isolated dry contacts).

The remote I/O signals may be accessed via the terminal block (TB1). See figure 4 for a detailed list of the signals.

Input

The signals are activated by the closing of an isolated dry contact. Signals to a number of Galaxy STS devices may be

connected in parallel and controlled by an NO (normally open) contact (see figure 4).

Max. voltage: 24 V DC

Max. current per input: 5 mA

Table 7: Remote input signals

Signal

Fault reset

Source 1 select

Source 2 select

Auto retransfer ON

Auto retransfer OFF

Transfer inhibit

Common

Signification

◗ Reset the alarm memory.

◗ Reset the optional buzzer.

◗ Remote reset.

Select Source 1 and preferred Source 1.

Select Source 2 and preferred Source 2.

Enable auto retransfer to the Preferred source.

Disable auto retransfer to the Preferred source.

Prevent transfers.

Return path for above signals.

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Output

The signals are emitted by dry relay contacts, rated 24 V DC, 1 A resistive.

Table 8 : Remote output signals

Note: except where indicated otherwise, the "signal" and "signification" describe device status when the NO contact is closed.

Detection circuits

The Galaxy STS comprises a number of circuits that monitor the voltage and current at various points of the device as well

as the status of the switches and the fans. These circuits send fault signals to the control logic and the display logic. Each

detection circuit is briefly presented below.

◗ Detection of blown fuse

The blown-fuse detection circuit monitors fuses F1, F2, F3, F4, F5 and F6.

◗ Detection of open SCRs

This circuit monitors the voltage upstream and downstream of the SCRs. If the circuit detects a fault, the Open SCR signal

(Source 1 or Source 2) is sent to the control logic.

◗ Detection of shorted SCR

This circuit monitors the current flowing through each SCR (12 total, 2 per phase for Source 1 and Source 2). If the circuit

detects a fault, the Shorted SCR signal (Source 1 or Source 2) is sent to the control logic.

◗ Internal monitoring circuits

The power-monitoring circuit monitors the regulated power supplies in the Galaxy STS. A failure results in a VFLT signal

being sent to the control logic and tripping of a general alarm.

◗ Detection of overload

Overload detection circuits (peak and average) are used in the Galaxy STS. Each phase is monitored independently for

the peak and average current. An overload status always inhibits the transfer function and is indicated by a flashing red U

LED for the inactive source. After clearing the overload, simultaneously press the KEY and FAULT RESET buttons to clear

the lock-out function. However, if the overload caused damage and a general alarm, the Galaxy STS must be set to

bypass mode and fully checked before a return to full operation.

◗ Phase status

The S1/S2 phase-condition LED is generally off. The phase detector compares the phase displacement between the

source voltages. If the phase displacement is greater than the pre-set value (0 to 25°), a phase-fault signal is sent to the

control logic and S1/S2 phase-condition LED turns red. The S1/S2 phase-condition LED also turns red if a source is no

longer within the permissible frequency range. The concerned source is identified by its U LED which turns orange.

◗ Voltage monitoring

The voltage-monitoring circuit, located on the Driver card (A3), monitors fuse voltages with respect to the programmed

voltage setpoints. If the setpoints are overrun, the "Undervoltage 10", "Undervoltage 30" or overvoltage status conditions

apply. This information is displayed by the U LEDs on the control panel, where green indicates the rated voltage, orange

the "Undervoltage 10" condition and red the "Undervoltage 30" or overvoltage condition. The Galaxy STS transfers to a

green source from an orange or red source, and to an orange source from a red source.

◗ Detection of temperature

A thermocontact is attached to each radiator assembly. If the radiator temperature exceeds the set value, the

thermocontact closes and the control logic transfers the load to the other source. If the manual transfer is forbidden

(impossible).

That can be released by the vigitherme. It is necessary to verify if we have not an excessive heating.

◗ Protection against internal faults

The Galaxy STS has a "No Single Point Failure" design. In the event of failure of an internal component, the Galaxy STS

switches to the operating status (transfer initiated or inhibited) which best ensures availability of the power supply to the

load, while an alarm is triggered to alert the operator.

A certain number of functions are redundant (power supplies, ventilation).

Signal

General alarm

Source 1 orange

Source 1 red

Source 2 orange

Source 2 red

Phase fault

Source 1 active

Source 2 active

Preferred source

Auto retransfer ON

Load supplied

Signification

Galaxy STS failure or power off -

NC contact closed = Fault

Source 1 downgraded.

Source 1 unacceptable.

Source 2 downgraded.

Source 2 unacceptable.

Phase outside tolerances.

Source 1 SCRs ON.

Source 2 SCRs ON.

XM9 terminal 2 = source 1, XM9 terminal 4 = source 2.

Activate auto retransfer to the Preferred source.

XM9 terminal 5 = ON, XM9 terminal 7 = OFF.

Closed path from source to load.

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◗ SCR monitoring

A dedicated device continuously monitors operation of each static-switch SCR (detection of SCR short-circuit fault, open

circuit fault, or gate control circuit failure). On detection of a fault, Galaxy STS switches to the best operating mode to

ensure the safety of the power supply to the load, according to the following sequences:

◗ transfer to and locking on the Alternate source if a "Preferred" SCR open circuit is detected, or if an "Alternate" SCR

short-circuit is detected.

On an "Alternate" SCR short-circuit fault, the Preferred source is isolated by shunt tripping of the isolating circuit-breaker of

the Preferred SS.

◗ transfer inhibit and locking on the Preferred source if a "Preferred" SCR short-circuit is detected, or if an "Alternate" SCR

open circuit is detected.

On a "Preferred" SCR short-circuit fault, the Alternate source is isolated by shunt tripping of the isolating circuit-breaker of

the Alternate SS.

Control-logic

The main functions of the control-logic circuit consist in controlling the SCRs,

circuit checking that a source complies with required characteristics prior to transferring the load to that source, receiving

fault signals from the detection circuits and in sending fault signals to the display logic. It can also send a trip signal to the

A5 card which in turn controls opening of an input switch.

When the control-logic circuit receives a fault signal from one of the detection circuits, it orders or inhibits transfer of the

load, depending on the type of source selected (i.e. supplying the load) and sends signals to turn on or off the appropriate

LEDs on the front panel.

Display-logic

The main functions of the display-logic circuit consist in acquiring the user

circuit commands entered on the front panel, receiving fault signals from the detection and control-logic circuits and in

turning on the appropriate LEDs on the front panel.

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5.2 TroubleshootingTroubleshooting is a methodical operation, involving tests on the Galaxy STS and measurements. It consists, first of all, in

detecting the existence of a fault condition and then specifically determining the cause(s) of the failure and locating the

failure on one or more components.

Success of troubleshooting operations depends on in-depth technical knowledge of the device (except for the most simple

faults, such as blown fuses, a faulty fan, etc.).

Repair work requires special training on the device, training that is provided to the specialized personnel of MGE UPS

SYSTEMS.

Warning: It is strongly advised to contact the after-sales support department of MGE UPS SYSTEMS.

Figure 11: Location of LEDs on the logic card

5 4 38 39 40

P7 P8 P9 P3 P6J5

P5

S3

S1

J4

P10

P15

P14

P11

J17

P13

P12

7

9

6

8

1011

12 13

15

17

14

1618

2019

21 3031

3233

35

37

34

36

28

26

29

2725

242322

3 2 1

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Table 9: LEDs on the logic card

Number

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

Signal name

SFLT

none

VFLT

S1DRV

S2DRV

UFLT

NOXFER

FLT13

GDRV1BAD

GDRV2BAD

PHSERR

FERR1

FERR2

OV1

UV1-10

UV1-30

OL1AVG

OL1OUT

BFUSE1A

BFUSE1B

BFUSE1C

SHRT1

SHRT2

OPN1

OPN2

BYP1

BYP2

OFFERR

DCD4B7

OV2

UV2-10

UV2-30

OL2AVG

OL2OUT

BFUSE2A

BFUSE2B

BFUSE2C

GALAXY STS function

System fault

Fan/thermal fault

Power-voltage fault

All Source 1 SCRs are ON

All Source 2 SCRs are ON

STS fault

Transfer inhibit

Power fault +13 VR

Source 1 management circuit fault +15V

Source 2 management circuit fault +15V

Phase differential outside tolerances

Source 1 frequency error

Source 2 frequency error

Source 1 overvoltage

Source 1 Undervoltage 10


Source 1 overload

Source 1 peak/average overload

Source 1 fuse blown, Phase A

Source 1 fuse blown, Phase B

Source 1 fuse blown, Phase C

Source 1 SCR short-circuit

Source 2 SCR short-circuit

Source 1 SCR OPEN

Source 2 SCR OPEN

Source 1 bypass circuit breaker closed

Source 2 bypass circuit breaker closed

SCR detection-circuit error

Not used

Source 2 overvoltage



Source 2 overload

Source 2 peak/average overload

Source 2 fuse blown, Phase A

Source 2 fuse blown, Phase B

Source 2 fuse blown, Phase C

Part no.

D33

D24

D27

D35

D36

D39

D40

D41

D42

D43

D44

D45

D46

D47

D48

D49

D50

D51

D52

D53

D54

D55

D56

D57

D58

D59

D60

D61

D62

D63

D64

D65

D66

D67

D68

D69

D70

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6. Maintenance

6.1 GeneralThis chapter supplies the necessary information for routine maintenance and troubleshooting to ensure correct operation of

the Galaxy STS. Only personnel having received training specifically on the device are authorized to carry out

maintenance or troubleshooting. Operating personnel who have not been specifically trained for maintenance on this

device must limit their work to identifying the symptoms of a fault.

6.2 Safety recommendationsFollow the general safety recommendations provided in page 3 of this manual.

Particular attention must be paid to the Caution and Warning sections in the following procedures. The meaning of the

terms "Caution" and "Warning" is the following:

Caution

Used to indicate an operating or maintenance operation, procedure or instruction that must be respected to avoid the risk of

endangering persons or damaging the equipment.

Warning

Used to indicate operations and procedures requiring particular attention to avoid major risks to the safety of persons.

Great care is required when carrying out all maintenance, troubleshooting and repair procedures. The parts of the Galaxy

STS that require particular care during maintenance or repairs are the following:

◗ All zones inside the cubicle if the load is supplied by the Galaxy STS;

◗ All zones in the lower part of the cubicle if the Galaxy STS is connected to an energized source or if the load is supplied

via the normal or maintenance bypass switch.

Caution

Before carrying out any maintenance operations inside the Galaxy STS cubicle, the device must be shut down (see section

3.2) or, if the load must remain supplied, the device must be set to bypass mode (see section 3.5).

Continuous monitoring of the operating status of all the electronic components considerably enhances the chances of

avoiding a hardware failure.

For this reason, it is advised to create a register to record any events occurring during preventive maintenance.

The Galaxy STS requires periodic preventive maintenance.

The following procedures must be carried out by trained personnel.

6.3 Preventive maintenance

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7. Characteristics

7.1 Electrical characteristics

7.2 General characteristics

Sources 1 and 2 inputs

Rated voltage (V rms)

Voltage range

Fated frequency

Number of phases

Type of connection

Output

Ratings (A rms)

Overload capacity

Manual transfer time

Automatic transfer time

Rated conditional short-circuit current

Indications and communication

Display, indications

Controls

Remote indications

Remote controls

Functions

Standard

400 V

-15% to + 15%

50 Hz +/- 5 %

3 phases + neutral, 3 ph switched, 3 ph + neutral interrupted

4-wire + earth

Characteristics for linear loads

30 - 50 - 100 - 160 - 250 - 400 - 600 A

110 % - 10 minutes

200 % - 20 s

500 % - 1 s

1000 % - 20 ms

≤ 400 µs typical and 500 µs max.

≤ 3 ms typical and 4.5 ms max.

35 kA

16 LEDs: animated mimic panel

8 pushbuttons on mimic panel

11 isolated changeover contacts

6 isolated controls

Continuous source monitoring

Automatic or manual transfer without interruption

Dual power supply and redundant fans

Adjustable transfer parameters

Isolating circuit breakers for maintenance

Control and indication mimic panel

Auxiliary relay card

Environement

Ambient temperature

Storage temperature

Ventilation

Relative humidity

Altitude

Noise level (as defined by ISO 3746)

Color

Reference standards

Construction and safety

Design

Degree of protection

Protection

0 °C to 40 °C

- 40 °C to 70 °C

Forced air:

◗ Entry from underneath, exit through back for 30 A, 50 A and 100 A STS.

◗ exit through top for 160 A, 250 A, 400 A and 600 A STS.

0 to 95%, without condensation

0 to 1 000 meters

(derating above 1 000 meters, 10% per additional 1 000 meters)

< 45 dBA for 30 A, 50 A and 100 A STS

< 60 dBA for 160 A, 250 A, 400 A and 600 A STS

RAL 9002

EN 50091-1, CEI 950

CEI 146

IP 20

Table 10 : Electrical characteristics

Table 11: General characteristics

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7. Characteristics

7.3 Mechanical characteristics

7.4 Customization

7.5 Fuse characteristics

ECustomization is carried out via a PC connected to the parameter-setting port using the Setpoint Control Panel Software.

Parameters

Phase differential

Overvoltage detection

Overvoltage detection hysteresis

“Undervoltage 10” detection

“Undervoltage 10” hysteresis

“Undervoltage 30” detection

“Undervoltage 30” hysteresis

Slow overload detection

Fast overload protection

Retransfer time delay

Interrupt time

Range

0 - 25°

105 to 120% of the

rated value

0 to 6% of the set

value

-5% to -25% of the

rated value

0 to 6% of the set

value

-20% to -32% of the

rated value

0 to 6% of the set

value

100% to 125% of the

rated current

150% to 250% of the

rated peak current

1 to 255 seconds

0 to 3 seconds

Default

setting

15°

112%

3%

-12%

3%

-25%

3%

110%

200%

3 s

Interrupt 0

second

Comments

Absolute value of phase displacement

between sources

Source unacceptable

Source downgraded

Source unacceptable

1/2 cycle running average

Instantaneous peak detection on all 3 phases

Duration of “source OK” check

For automatic out-of-phase transfers

Galaxy STS

30 A

50 A

100 A

160 A

250 A

400 A

600 A

Fuses

F1, F2, F3 F4, F5, F6 F7 F8

200A-660V 200A-660V 6A-500V 6A-500V

200A-660V 200A-660V 6A-500V 6A-500V

200A-660V 200A-660V 6A-500V 6A-500V

450A-660V 450A-660V 6A-500V 6A-500V

450A-660V 450A-660V 6A-500V 6A-500V

1000A-660V 1000A-660V 25A-500V 25A-500V

1000A-660V 1000A-660V 25A-500V 25A-500V

Galaxy STS

30 A

50 A

100 A

160 A

250 A

400 A

600 A

Dimensions and weight

W D H Weight

715 mm 825 mm 1385 mm 180 kg

715 mm 825 mm 1385 mm 180 kg

715 mm 825 mm 1385 mm 180 kg

715 mm 825 mm 1900 mm 250 kg

715 mm 825 mm 1900 mm 250 kg

1015 mm 825 mm 1900 mm 430 kg

1015 mm 825 mm 1900 mm 430 kg

Table 12: Mechanical characteristics

Table 13: Configurable parameters and setting ranges

Table 14: Fuse ratings for the various STS devices

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7. Characteristics

7.6 Losses

7.7 Electromagnetic-compatibility standards

Galaxy STS

30 A

50 A

100 A

160 A

250 A

400 A

600 A

Losses in W for RL loads

1/4 x Pn 1/2 x Pn 3/4 x Pn 1 x Pn

- 50 90 140

60 120 130 160

110 200 320 600

440 490 540 890

320 340 1190 1390

560 1020 1160 2160

730 1200 1380 2200

Immunity to:

Conducted and radiated emissions

Electrostatic discharges

Radiated fields

Low-energy impulse waves

High-energy impulse waves

Conducted disturbances

EMC standards

EN 55011 - level B

EN 50091-2

CEI 1000-4-2 level 3





Table 15: Losses

Table 16: Electromagnetic-compatibility standards

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8.1 List of the figures in the manual

8. Annexes

Figure 1: Simplified diagram of Galaxy STS ........................................................................................................................... 6

Figure 2: Typical diagram of a Galaxy STS installation. ......................................................................................................... 7

Figure 3: Space to reserve arround the Galaxy STS cubicles ............................................................................................... 8

Figure 4: Terminals on the INTY card ..................................................................................................................................... 9

Figure 5: Internal view of Galaxy STS 30 A, 50 A and 100 A ............................................................................................... 10

Figure 6: Internal view of Galaxy STS 160A and 250A ........................................................................................................ 11

Figure 7: Internal view of Galaxy STS 400A and 600A ........................................................................................................ 12

Figure 8: Typical connection diagram for a Galaxy STS on TNS systems ........................................................................... 14

Figure 9: Typical connection diagram for a Galaxy STS on TNC systems .......................................................................... 14

Figure 10: Mimic panel with controls and indication LEDs .................................................................................................... 17

Figure 11: Location of LEDs on the logic card ...................................................................................................................... 23

8.2 List of the tables in the manual

Table 1: Cable cross-sections ............................................................................................................................................... 13

Table 2: Protection for a TNS system ................................................................................................................................... 13

Table 3: Protection for a TNC system ................................................................................................................................... 13

Table 4: Description of the indication LEDs .......................................................................................................................... 18

Table 5: Description of pushbuttons ..................................................................................................................................... 18

Table 6: Isolation and bypass switches ................................................................................................................................ 18

Table 7: Remote input signals. ............................................................................................................................................. 20

Table 8: Remote output signals ............................................................................................................................................ 20

Table 9: LEDs on the logic card ............................................................................................................................................ 24

Table 10: Electrical characteristics ....................................................................................................................................... 26

Table 11: General characteristics ......................................................................................................................................... 26

Table 12: Mechanical characteristics .................................................................................................................................... 27

Table 13: Configurable parameters and setting ranges ........................................................................................................ 27

Table 14: Fuse ratings for the various STS devices ............................................................................................................. 27

Table 15: Losses ................................................................................................................................................................... 28

Table 16: Electromagnetic-compatibility standards .............................................................................................................. 28

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140, Avenue Jean KuntzmannZIRST - Montbonnot St Martin38334 - Saint Ismier Cedex - Francewww.mgeups.com

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MGE GALAXY STS - Installation & User Manual

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