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DESCRIPTION USERS GUIDE
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SCU for NetSure 201, 501 and 701Power Supply Systems
Emerson Network Power Energy Systems AB 2007 All rights reserved
The contents of this document are subject to revision without notice dueto continued progress in methodology, design, and manufacturing.
Emerson Network Power Energy Systems AB SE 141 82 Stockholm
Sweden
Tel. +46 8 721 6000 Fax. +46 8 721 7177 www.emersonenergy.com
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Contents
1 General 31.1 Communication 32 Software functions 62.1 Control functions 62.2 Supervision functions 92.3 Alarm management 102.4 Site status 103 Handling the SCU 113.1 Operation panel 113.2 Menu tree structure 124 Abbreviations used in this document 18
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1 General
SCU is a standard control unit used in DC power supply systems NetSure201, 501 and 701. It communicates with the other units of the power supplysystem and manages alarm handling, data processing, voltage control, etc.
1.1 Communication
Figure 1. SCU with connection board.
1.1.1 Internal
The control- and the rectifier-units are equipped with LEDs that provide rele-vant information regarding system- and unit-status, and guide the servicetechnician to the right unit in case of trouble.
The display is graphical. It provides extensive information regarding systemstatus and allows system parameters and setting to be checked and adjusted.
The alarm events are classified into different alarm categories. Different alarmcategories have different visual/audible alarm and alarm-call back activities.
RS 232
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Alarm Category Red LED YellowLED
AlarmBuzzer
AlarmCall-back
Remark
Critical Alarm ON ON Yes Call-backfunction en-abled
Major Alarm ON ON Yes Call-backfunction en-abled
ObservationAlarm
ON OFF No
No Alarm OFF OFF OFF No
Table 1. SCU alarm categories.
The audible alarm is silenced if the user presses any key on SCU, if the fault
that triggers the alarm is cleared or after 10 min (settable). The audible alarmcan be disabled from a menu in the LCD display.
The alarm LED stops emitting light if all the faults that trigger the alarm arecleared.
1.1.2 Input/output terminals
Eight configurable digital inputs are provided on the connector board placedabove the SCU. The connections to the connector board are described in theINSTALLATION INSTRUCTIONS for the respective system.
Eight potential free relay outputs are provided on the connector board. Thereare both closing and opening contacts on each output.
Three of the relays are default configured and mapped to alarms of the follow-ing alarm severity:
Relay 1 Opened: normal operationClosed: critical alarm (Critical) indicating that the power systemscontinued operation may be at risk and that the supply of the prior-ity loads is, or might soon be affected. Immediate action is re-quired.
Relay 2 Opened: normal operationClosed: alarm (Major) indicating a failure that requires action whenconvenient from the point of view of workload.
Relay 3 Opened: normal operationClosed: alarm (Observation), signalling that the power systemdoes not perform to its maximum but that the loads are not af-fected. No action is required.
Each relay is individually configurable, using the graphical display.Any alarm signal available in the system can be connected to a relay output.
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1.1.3 Remote communication
Figure 2. Remote communication.
The system supports the EEM protocol. This protocol supports active alarmmanagement, which is to say that the system reports alarms automatically onoccurrence.
For communication with the EEM system an RS232 terminal is provided at theconnector board front for direct connection or via a PSTN modem. See Figure1.
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2 Software functions
2.1 Control functions
2.1.1 System voltage
The set voltage of the rectifiers is configurable from the SCU.
In case temperature compensated battery charge is activated the voltage willbe adjusted in accordance with the battery temperature.
2.1.2 Temperature compensated battery voltage
To compensate for some of the negative effects on batteries caused by highambient temperatures, this function can be used. However, it requires connec-
tion of a temperature sensor.
The function adds a correction term related to the temperature of the batteries tothe nominal value of the system voltage. The degree of regulation can be set.
The maximum influence, U of the function, is 2 V from the nominal systemvoltage.
The temperature compensation is disabled if there is a rectifier communicationfailure, DC over/undervoltage or a low voltage disconnection.
TnomTlower
Temp comp coeff
(mV/C/string)
U (V)
Batt.Temp(C)
0
Tupper
Unom
Ulow
50
100
200
Uhigh
U max2 V
Figure 3. Temperature compensated voltage control.
Unom: Nominal voltage (value at nominal temperature).
Uhigh: Upper voltage level where compensation ends, 56.0 V.
Ulow: Lower voltage level where compensation ends, 47.2 V.
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Tnom: Nominal temperature +20 C (no compensation is done at this tem-perature).
Tupper: Upper temperature where compensation ends, +40C.
Tlower: Lower temperature where compensation ends, 0C.
2.1.3 Battery boost charging
Boost charging voltage is used to reduce the charging time after a mains fail-ure and to equalise the charge level of the batteries. The charging functioncan be initiated cyclically, automatically or manually.
The battery manufacturers instructions for boost charging shall be observed.
Start of charging
When the battery charge current exceeds a preset value for 3 minutes or if thecalculated battery capacity has decreased to a preset value (after a mains
failure, for example), the charging function of the SCU is activated. A chargingsignal is sent from the SCU to the rectifiers to increase the voltage up to thebattery charging level U3.
Battery current limitation
After a mains failure or when some battery cells are permanently damaged,the current to the batteries can be quite extensive. To avoid overheating or fur-ther damages to the battery, the SCU will limit the battery current to a presetlevel by limiting the charging voltage of the rectifiers. Should the battery cur-rent still exceed a higher preset value an alarm will be issued.
Stop of charging
When the charging current drops below a preset value a defined prolongedcharging time is started before the charging is stopped and the voltage of therectifiers returns to the float charging level (U1). For security there is a boostcharging limit time that stops the charging after a preset time.
U2
U1
I4
Tcharge
Voltage/Current
Mains failure
Time
U1 = Battery float voltage
I4= Charging current alarm
I1 = Aut. boost start current
U2 = Charging voltage
I2 I1
I2 = Start of fixed boost charging duration
Fixed timeduration
Stop of boostcharging
Boost limittime
I3
I3= Fixed charging current
Start of fixedtime duration
Figure 4. Voltage course on mains failure and automatic boost charging.
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2.1.4 Very high battery temperature handling
If the battery temperature exceeds the very high battery temperature alarm level,the system voltage will be reduced to the defined voltage for this function.
2.1.5 Battery test
The battery test has three modes, short time test (requires two battery shunts),time test and stable current test.
Battery tests can be started either manually or automatically at scheduledtimes for regular test of battery status.
For manual battery tests as well as for cyclic battery tests the following parame-ters must be set: End voltage, Test time and Battery capacity discharge limit.
Figure 5. Battery test diagram.
The battery tests follow the procedure described below:
In time test mode, the output voltage of the rectifiers is reduced so thatonly the batteries power the load. If the batteries fail, the rectifiers willpower the load.
In stable current test mode, the output voltage of the rectifiers is reducedso that the batteries give the preset test current to the load.
This test will continue until one of the following three situations occurs:
The preset test time, see Figure 5, expires. The battery has passed thetest.
The battery voltage drops below the preset end voltage level (Uend) (Figure5). The battery has notpassed the test and the test is interrupted.
The battery capacity drops below the preset Test end battery capacity.The battery has notpassed the test and the test is interrupted.
An alarm is issued in the system.
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After the test, the output voltage of the rectifiers will increase again so thatthe rectifiers feed the plant and charge the batteries.
2.1.6 Backup control
To prevent serious damage to the batteries during a long mains failure the
loads can be disconnected by voltage-, or time-control, if LVD contactors areincluded. The software supports load disconnection in to two steps. First stepis Normal load disconnection; second step is Prio load disconnection.
Load reconnection is made automatically on the return of AC mains.
2.1.6.1 Voltage controlled disconnection
When the set voltage level is reached the backup batteries are disconnectedfrom the selected loads.
2.1.6.2 Time controlled disconnection
When the set time has elapsed the backup batteries are disconnected fromthe selected loads.
2.2 Supervision functions
2.2.1 Fuse (circuit breaker) alarms
If a distribution or battery fuse (circuit breaker) that has a load connected hasreleased due to overcurrent or short-circuit or has been removed/manually re-leased, alarms are initiated.
2.2.2 Voltage alarms
One overvoltage and two undervoltage levels are supervised.
2.2.3 Battery temperature supervision
The battery temperature can be supervised by the means of a temperaturesensor mounted on one battery cell.
Alarms are provided in two steps in case of high temperature.
There is also an alarm at low battery temperature.
2.2.4 Ambient temperature supervision
Alarms are provided in case of high or low ambient temperature.
2.2.5 Mains supervision
In case of mains failure from all rectifiers, the SCU detects it as a generalmains failure.
2.2.6 Rectifier supervision
In case of mains or rectifier failure, alarms are sent to the SCU.
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2.3 Alarm managementAlarm severity
The severity of all predefined alarms can be set.
2.3.2 Incoming alarms
The digital alarm inputs can be configured regarding name, severity and polarity.
2.3.3 Outgoing alarms
The output alarm terminals can be configured by selecting the alarms withcombinations in between them.
2.3.4 PLC alarms
Note: Can be configured with the optional software Power kit only.
By using the boolan expressions AND and OR alarms can be configured to
influent an outgoing alarm relay.
2.3.5 Security
All settings of the SCU can be password protected. There are three differentlevels of passwords that can be set and enabled/disabled via the LCD display.
PasswordLevel
Authority User DefaultPassword
User Set the parameters, control and op-erate the DC Power System
For commonuser
1
Engineer All the common users authorities, re-set the system parameters, re-setthe password and change the sys-tem type.
Engineer 2
Administrator All the engineers authorities, changethe password, control the audiblealarm volume, and browse the sys-tem parameters set through MC.
Administrator 640275
2.4 Site status
The software presents detailed information on measured data, alarms, alarmhistory, equipment data and site inventory.
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3 Handling the SCU
Only a person who is adequately trained and is authorized may change thevalues set in the SCU. The value settings can be made by using the keys andthe display of the SCU.
3.1 Operation panel
The SCU has an LCD screen with backlight, function keys and indicator LEDs.For fixing the unit to the cabinet slot there is a handle with a locking latch.
O p e r a t i o n i n d i c a t o r
A la rm in d ic a to r
P r o t e c t i o n i n d i c a t o r
L C D
F u n t io n k e y s
H a n d l e w it h la t c h
Figure 6. SCU front panel.
3.1.1 LEDs
LEDNormalStatus
AbnormalStatus
Cause
Operation Indicator(Green)
ON OFF No Power Supply
Protection Indicator(Yellow)
OFF ONDC Power has an ob-
servation alarm
Alarm Indicator(Red)
OFF ONDC Power has a majoralarm or critical alarm.
Table 2.
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3.1.2 Function keys
The keys are used to move through the display menus.
KeyName of
KeyFunctions
ESCReturn
KeyPress this key to back to lastmenu.
ENTEnterkey
Press this key to go to nextmenu or validate the changemade to a parameter setting.
Press ESC and ENT togetherto reset SCU
Up Down
Pressor to scroll
through the menus or changethe value of a parameter.
Left
Right
Pressorto move the
cursor in the screen. In Initial
Screen, pressorto
adjust the contrast of LCD.
These four arrow keys can beused to change the value of a
parameter: Pressorto
move the cursor to the pa-rameter to be changed and
pressor to change
the value of a parameter.
3.2 Menu tree structure
3.2.1 SCU initialising screen
After the SCU starts up, its LCD displays the following screen requiring theuser to select language:
English
After the user selects the language, the LCD displays Waiting requiring theuser to wait while SCU is initialising.
Waiting..
When ready, SCU displays Initial Screen with System Information:
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Figure 7. Initial screen.
The system information is displayed in several screens that are reached byscrolling by the key.
If no key of the SCU has been pressed for 8 minutes, the LCD will automati-cally display the initial screen with the system information and turn off its LCDbacklight to protect the LCD screen. Pressing any key will turn on the LCDbacklight.
3.2.2 Main menu screen
In any System Information Screen, press ENT key to enter Main MenuScreen.
Main Menu Screen has 3 sub-menus that are Status, Maintenance andSettings respectively.
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Figure 8. Main menu tree.
To reach the Maintenance or Settings menu a password is required.
Note: If the text Need Manual Mode is indicated when entering the pass-word, the system must be set to Mode: Manual in the menu Set-
tings/Batt. Settings/Batt. Selection.
3.2.3 Status menu
In this menu information on the rectifier status, active alarms and alarm historycan be selected.
The SCU can display 50 active alarm information screens and up to 200 his-tory alarms. The oldest history alarm will be deleted automatically if the totalnumber of history alarms exceeds 200.
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3.2.4 Maintenance menu
Note: The system control function is only enabled when the battery man-agement function is set to manual control mode.
After entering any level of password the user can control the battery
charge/test and load disconnect functions manually. Each individual rectifiercan also be controlled regarding its voltage/current and start/stop.
Note: Be careful when using the low voltage disconnect function that mayinterrupt the operation of load!
Figure 9. Maintenance menu.
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3.2.5 Settings menu
Figure 10. Settings menu.
For configuring the SCU, see the document TABLE OF SET VALUES
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3.2.5.1 Alarm settings
From these menus it is possible to configure alarm type and level for the out-put alarm relays and to activate the digital signal inputs. Furthermore the audi-ble alarm can be blocked and the alarm history can be cleared.
3.2.5.2 Battery settings
From these menus all the battery management configurations are set.
When setting the battery capacity it must be observed that the SCU regardsan individual battery as the battery string(s) connected to one measuringshunt. As there normally is only one shunt in the system, it means that thevalue of the total battery capacity in the system should be used when configur-ing the battery settings.
Note: The function Short test should be set to N (no), as it cannot be im-plemented in systems with a single battery shunt.
3.2.5.3 AC settings
From these menus the AC voltage alarm levels are set.
Note: This function is not supported.
3.2.5.4 DC settings
From these menus the DC voltage and ambient temperature alarm levels areset.
3.2.5.5 Rectifier default settings
Individual rectifier output voltage and current limitation can be set from thesemenus. The individual values are used if the communication with the SCUfails. The walk-in (soft start), the fan speed and the high voltage shut downfunctions can also be configured from these menus.
3.2.5.6 System settings
System parameters like language, date, time, modem communication speed,password and system type are set in these menus.
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4 Abbreviations used in this document
AC Alternating CurrentDC Direct CurrentEEM Emerson Energy Master
ENERGY MASTER is a registered trademark ofEmerson Network Power Energy Systems AB
EMAS Energy Master Management Application Software, Unix based software for monitoring of Emerson Network Power equipmentEXMG Energy Master exchange Manager, Windows based software for monitoring of Emerson Network Power equipmentGSM Global System for Mobile communicationLC Local ComputerLCD Liquid Crystal DisplayLED Light Emitting DiodeLVD Low Voltage Disconnect
PSMS Power Supply and environment Monitoring SystemPSTN Public Switched Telephony NetworkPSU Power Supply Unit (AC/DC converter, rectifier)SCU Standard Control Unit