Publication: Rev First Printing 06/96 Copyright

9 3028 00 990 B Revised - 12/2001 1996 - 2001

Basler Electric

Phone 618 654-2341

Route 143 Box 269

Highland IL 62249 USA

Power Systems Group

Fax 618 654-2351

http://www.basler.com

info@basler.com

INSTRUCTIONSFOR

VOLTAGE REGULATORMODEL: AVC63-7

9 3028 00 100

INTRODUCTION

The Basler AVC 63-7 Voltage Regulator is anencapsulated unit contained in a plastic case.The regulator controls the dc exciter field power ofconventional, 50 or 60 Hz brushless generatorsthat have a 63 Vdc exciter field to regulate thegenerator output voltage.

Regulation is provided by sensing the generatoroutput voltage, converting it to a dc signal andcomparing the signal to a reference voltage signal.An error signal is developed and used to controlthe dc field power in order to maintain a constantgenerator output.

ELECTRICAL SPECIFICATIONS

Dc Output Power7 Adc at 63 Vdc maximum continuous with a 240Vac input.

Exciter Field DC Resistance9.0 ohms minimum.

Ac Power Input170 to 305 Vac, single-phase, 50/60 Hertz.Burden: 900 VA maximum at 240 Vac power.

Ac Sensing Voltage170 to 264 Vac, single-phase, 50/60 Hertz.Burden: 5 VA.

Voltage Adjust Range170 to 264 Vac using the internal voltage adjust.The external voltage adjust provides a ±10%adjustment of the nominal value determined by theinternal voltage adjust.

Regulation AccuracyPlus/minus 0.25%.

Voltage Drift<±1% voltage variation for a 50°C (90°F) change.

Response Time<16mSec.

Frequency CompensationRefer to Figure 1.

Voltage Build-UpInternal provisions for automatic build-up fromgenerator residual voltages as low as 6 Vac at 25hertz.

Power Dissipation35 W maximum.

Paralleling ProvisionsCT input for customer supplied 5 Amp nominal CT.Adjustable droop from 0 to 6% with 5 Amps inputat 0.8 power factor.

PHYSICAL SPECIFICATIONS

Operating Temperature

-40�C (-40�F) to +60�C (+140�F).

Storage Temperature-65�C (-85�F) to +85�C (+185�F).

VibrationWithstands 1.2 Gs at 5 to 26 Hz; 0.036" doubleamplitude at 27 to 53 Hz; 5 Gs at 53 to 1000 Hz.

ShockWithstands up to 15 Gs in each of three mutuallyperpendicular axes.

Weight1.1 lb (0.5 kg) net.

INSTALLATION

MountingThe regulator may be mounted in any position.Refer to the outline drawing (Figure 2). Theregulator may be mounted directly on thegenerator set using 1/4" hardware. Select theproper hardware to withstand any expectedshipping/transportation and operating conditions.

InterconnectionRefer to Figures 3 and 4.a. Connect a jumper from COM to the 50 Hz

terminal for 50 Hz operation, or leave the twoterminals unconnected for 60 Hz operation.

b. If an external voltage adjust control is beingused, connect the potentiometer to terminals6 and 7 as shown. If not, connect a jumperbetween terminals 6 and 7.

c. Connect the exciter field to terminals F+ andF-. Be sure to observe polarity.

d. Connect the input power to the generatorstator to provide power to terminals 3 andE3/4. Fuse both leads. Install the optionalshutdown switch, if desired.

e. Connect the sensing input to E1 and E3/4.The sensing should be connected "line-to-line".

Parallel CompensationWhen it is required to operate the regulator inparallel with an isolated or utility bus, in addition tothe regulator provisions, a 10 VA currenttransformer (CT) is required (See Figures 3 and 4.)This CT is connected in a generator line andshould deliver from 3 to 5 amperes secondarycurrent at rated load.

The phase relationship of CT signal to theregulator sensing voltage must be correct or thesystem will not parallel properly. The CT must beinstalled in the line of the three-phase generatorthat does not supply sensing to the regulator.

Figures 4 and 5 show the correct CT polarity for A-B-C phase rotation sequence. If the phase rotationsequence is A-C-B, the CT’s secondary leadsmust be interchanged.

Reactive Droop CompensationFor reactive droop compensation, connect the CTto its respective regulator as shown on Figures 4and 5.

A unit-parallel switch shorts the parallel CTsecondary to prevent any droop signal from beinginjected into the regulating system during singleunit operation. The switch may not be required onparallel droop compensation applications where avoltage drop is not objectionable.

Reactive Differential CompensationOn parallel reactive differential compensationapplications a contact should be used to short outthe paralleling CT secondary when that generatoris not paralleled to the bus. If the switch is notused, a voltage droop will be introduced into thesystem. This is due to the unloaded generatorparallel CT not supplying its compensating signal,but allowing a voltage drop to occur across it.Lack of this shorting contact will also cause thevoltage of the incoming generator to fluctuate priorto paralleling. Ideally, this contact is an auxiliaryon the circuit breaker contactor that opens whenthe circuit breaker is closed.

For reactive differential compensation, connecteach CT to its respective regulator. Then connectthe finish of the first CT to the start of the secondCT, the finish of the second CT to the start of thethird CT, etc. Continue until all CT’s areconnected in series. The final step will be toconnect the finish of the last CT to the start of thefirst CT. (See Figure 5).

Reactive differential compensation cannot be usedwhen paralleled with the utility or any infinite bus.If this compensation system is used, a switchingcircuit must be used to convert the system to areactive droop compensation system. Contact thefactory for additional information.

OPERATION

GeneralThe below procedures provide instructions forsetting up, starting, operating, and adjusting theAVC 63-7 Voltage Regulator. Symptoms ofproblems occurring during start-up that result fromincorrect regulator adjustment and certaingenerator system problems that resemble faultyregulation, are included together with possiblesolutions.

Preliminary Set-UpTo prevent damage to the regulator, complete thefollowing steps before proceeding with systemstart-up.

a. Verify that the voltage regulator specificationsconform with the generator system re-quirements.

GE

NE

RA

TO

R O

UT

PU

T V

OLT

AG

E(%

OF

NO

MIN

AL)

0 10 20 30 40 50 60

20

40

60

80

100

120Corner Frequency

50 Hz

60 Hz

FREQUENCY (HZ) P0004-19.vsd10-26-00

Figure 1. Typical AVC 63-7 Frequency Compensation Curves

b. Ensure that the regulator has been installedand connected in accordance with theparagraphs on installation.

Operation At Reduced SpeedsDuring periods of prime mover idling, use theshutdown switch to remove power from the regu-lator.

System Start-Upa. Perform preliminary set-up as described in the

above paragraphs.b. Start the prime mover and bring up to rated

speed.Result: Voltage should build up. If not,perform field flashing.

c. Slowly adjust VOLT adjustment or externalvoltage adjust rheostat until the generatoroutput voltage reaches the nominal value.

d. Apply and remove load to check stability.

e. Check the regulator under normal operatingconditions.Result: If regulation is not within range,verify the prime mover is at rated speed.

f. Reduce generator frequency to approxi-mately 5 Hz below nominal. Result: Generator output voltage shoulddecrease at desired frequency.

AdjustmentsField Flashing. When the regulator is operatedwith the generator for the first time, the polarity ofthe residual magnetism may not be correct or ofsufficient magnitude. If the residual voltage atterminals 3 and 4 is greater than 6 Vac, replacethe regulator. If generator residual voltage is lessthan 6 Vac at terminals 3 and 4, shut down theprime mover and proceed with the following steps.

a. With the prime mover at rest, apply a dcsource (ungrounded), of not more than 48Vdc, to terminals F+ (positive) and F-

(negative) in series with a limiting resistor. Useone ohm of resistance for each volt from the dcpower source with a power rating of least one wattper ohm. EXAMPLE: If using a 24 Vdc source,use a 24 ohm, 24 watt resistor.b. Allow the field to be flashed for approximately

ten seconds before removing the dc source.c. If voltage build-up does not occur after

performing steps a and b, verify the polarity ofthe dc source used in steps a and b andperform again.

Frequency Roll-Off Adjustment. The AVC 63-7underfrequency adjust is factory preset to causean average 1 volt drop in the generator's line inputvoltage to the regulator when the frequency isbetween 54.5 and 55.5 Hz (for 60 Hz applications). For 50 Hz applications, the frequency roll-off isfactory preset to between 44 and 46 Hz. To resetthe frequency roll-off, proceed as follows:.a. Adjust the prime mover RPM to the desired

frequency compensation (corner frequencyroll-off) point.

b. Adjust the front panel FREQ control CW untilthe output voltage starts to drop off.

c. Bring the prime mover up to rated speed. Theoutput voltage should return to normal.

Stability Adjustment. An oscilloscope or othervoltage recording device should be used if astability setting is desired that will provide thefastest possible voltage response with good gen-erator stability.a. Rotation of the front panel STAB control in the

clockwise (CW) direction will slow responsetime.

b. Rotation of the front panel STAB control in thecounter-clockwise (CCW) direction will speedresponse time. If rotated too far CCW, thegenerator voltage may oscillate (hunt).

c. Rotate the front panel STAB control CCW untilthe system starts oscillating and then rotateCW just past the point where oscillationoccurred.

Voltage Adjustment..a. Installation of a jumper across terminals 6 and

7 allows the internal (front panel) VOLT

adjustment to vary the generator nominal voltageover the range shown in the Specifications.b. A 1500 ohm, 2 watt rheostat may be

connected to terminals 6 and 7. This will allowapproximately +10% adjustment via theremote, 1500 ohm rheostat.

Droop Adjustment. The droop adjustment allowsfor adjustment of the amount of droop which willoccur in the generator output voltage for a givenamount of reactive load current. A CT should beselected which will supply the AVC with 3 to 5amperes of current with rated load and powerfactor on the generator. With 5 amperes of currentsupplied by the CT, at 0.8 power factor, theamount of droop can be adjusted from 0 to 6% ofnominal generator voltage.a. Determine the amount of droop desired; 3% to

5% is common. Adjust the droop potentio-meter fully CCW.

b. Bring the generator up to rated speed andrated voltage. Apply full load at rated powerfactor.

c. Adjust the droop potentiometer until thedesired amount of droop is achieved.

OPERATIONAL TESTTo operationally test any AVC 63-7, refer to Figure6 and perform the following steps.a. Connect the voltage regulator as shown in

Figure 6 and apply 240 Vac.b. Adjust the front panel VOLT control fully

counter-clockwise (CCW).RESULT: Observe that the lamp does notlight.

c. Adjust the front panel VOLT control fullyclockwise (CW).RESULT: Observe that the lamp is now lit.

d. Adjust the front panel VOLT control until thelamp just goes out.

Regulator operation is satisfactory if the aboveresults are obtained. Stability, however, must betested with the generator and regulator operating.

CAUTIONDo not flash the field with the generator inmotion. The regulator may be damaged.

A

B

C

FIELD

EXCITER

OPEN TO PARALLELCLOSE FOR SINGLE UNITUNIT/PARALLEL SWITCH

RHEOSTATVOLT. ADJ.REMOTE

1.5K2W

CW76COM50E1 213F+F-

AVC63-7 P0004-21.vsd

11-02-00

GENERATOR200 - 240 VAC

50/60 HZ

3

4E3

5A SEC NOMINALPARALLELING CT

TO LOADOR

CIRCUITBREAKER

4

22

21

1

1

2

3

4

Phase rotation A-B-C.

Item not supplied by Basler Electric Co.

If remote voltage adjust is not used, short terminals 6 and 7 together.

Short terminals 50 and COM together for 50 Hz operation. Leave unconnected for 60 Hz operation.

Figure 3. Typical Shunt-Powered Interconnection Diagram

1

1

1

1

+

5 .517

4.528

.51

.35 TYP.

(10 PLCS)

1 2 7 6 5 0 C O M E 1 E3 /4 3 F + F -

DROOP

U/F

STAB

VOLT

.228 DIA.4 PLCS(5.7)

2.983(MAX.)(74.5)

TERM., QC, MALE.032 X .250(.8 X 6.25)

NOTES:

1.) DIMENSIONS ARE IN INCHES (MILLIMETERS).

2 DIMENSIONS TO TERMINALS ARE APPROXIMATE.

3.) NET WEIGHT = 1 LB. 1 OZ.

4.) WATTS DISSIPATED = 35 MAX.

2

2

(8.7)

(12.7)

(113.2) (12.3)

(12.3)

.70(17.5)

4.917 3.928(122.9) (98.2)

(137.9)

(27.5)

.492

.492

1.10P0004-20.vsd

10/31/00

Figure 2. AVC 63-7 Outline Drawing

A

B

C

FIELDEXCITER

OPEN TO PARALLELCLOSE FOR SINGLE UNITUNIT/PARALLEL SWITCH

RHEOSTATVOLT. ADJ.REMOTE

1.5K2W

CW76COM50E1 213F+F-

AVC63-7 P0004-22.vsd

11-02-00

GENERATOR200 - 240 VAC

50/60 HZ

3

4E3

5A SEC NOMINALPARALLELING CT

TO LOADOR

CIRCUITBREAKER

4

22

21

1

1

2

3

4

Phase rotation A-B-C.

Item not supplied by Basler Electric Co.

If remote voltage adjust is not used, short terminals 6 and 7 together.

Short terminals 50 and COM together for 50 Hz operation. Leave unconnected for 60 Hz operation.

AUXILIARYWINDING

Figure 4. Typical Auxiliary Winding PoweredInterconnection Diagram

A

B

C

GENERATOR1

CT

E1 21

Regulator 1

P0004-23.vsd

11-02-00

4E3

A

B

C

GENERATOR1

CT

E1 21

Regulator 2

4E3

A

B

C

GENERATOR1

CT

E1 21

Regulator 3

4E3

NOTES:When more than 3 generators are to be paralled,continue connections as shown.

Paralleling CT polarities are shown A-B-Cphase rotation.

1)

2)

Figure 5. Reactive Differential (Cross Current)Compensation CT Interconnection

10 OHM10 WATT

LIGHT BULB120 V

240 VAC

76E1 3F+F-

AVC63-7 P0004-24.vsd

11-02-00

4E3

Figure 6. Operational Test