AVC63-7
9302800991
B
Instructions
03/12
2012
www.basler.com
+1 618.654.2341 (USA)
info@basler.com
Model
AVC63-7
Voltage Regulator
INTRODUCTION
The Basler AVC 63-7 Voltage Regulator is a potted unit
contained in a plastic case. The regulator controls the dc
exciter field power of conventional, 50 or 60 Hz brushless
generators that have a 63 Vdc exciter field to regulate the
generator output voltage.
Regulation is provided by sensing the generator output
voltage, converting it to a dc signal and comparing the signal
to a reference voltage signal. An error signal is developed
and used to control the dc field power in order to maintain a
constant generator output.
ELECTRICAL SPECIFICATIONS
DC Outp ut Power
7 Adc at 63 Vdc maximum continuous with a 240 Vac input.
Exciter Field DC Resistance
9.0 ohms minimum.
AC Power Input
170 to 305 Vac, single-phase, 50/60 Hz.
Burden: 900 VA maximum at 240 Vac power.
AC Sensing Voltage
170 to 264 Vac, single-phase, 50/60 Hz.
Burden: 5 VA.
Voltage Adjust Range
170 to 264 Vac using the internal voltage adjust. The
external voltage adjust provides a ±10% adjustment of the
nominal value determined by the internal voltage adjust.
Regulation Accuracy
±0.25%
Voltage Dr ift
<±1% voltage variation for a 50°C (122°F) change.
Response Time
<16 ms
Frequency Compensation
Refer to Figure 1.
Voltage Buildup
Internal provisions for automatic buildup from generator
residual voltage as low as 6 Vac at 25 Hz.
Power Dissipation
35 W maximum
Paralleling Provisions
CT input for customer supplied 5 A nominal CT. Adjustable
droop from 0 to 6% with 5 A input at 0.8 power factor. CT
input burden is 2.5 VA.
Description
PHYSICAL SPECIFICATIONS
Temper ature
Operating: –40 to 60°C (–40 to 140°F)
Storage: –65 to 85°C (–85 to 185°F)
Vibration
Withstands 1.2 G at 5 to 26 Hz; 0.036" double amplitude at
27 to 53 Hz; 5 G at 53 to 1,000 Hz.
Shock
Withstands up to 15 G in each of three mutually
perpendicular axes.
Agency Recognition
Certified per CSA Standard C22.2 No. 14
Weight
17 oz (482 g) net.
INSTALLATION
Mounting
The regulator may be mo unted in any position. Refer to the outline
drawing (Figure 2). The reg ulator may be mounte d directly on the
generator set using ¼" hardware. Select the prope r hardware to
withstand any expected shipping/tra nsportatio n and operating
co ndi tions.
Interconnection
Refer to Figures 3 and 4.
1. Connect a jumper from COM to the 50 Hz terminal for
50 Hz operation, or leave the two terminals
unconnected for 60 Hz operation.
2. If an external voltage adjust control is being used,
connect the potentiometer to terminals 6 and 7 as
shown. If not, connect a jumper between terminals 6
and 7.
3. Connect the exciter field to terminals F+ and F–. Be
sure to observe polarity.
4. Connect the input power to the generator stator to
provide power to terminals 3 and E3/4. Fuse both leads.
Install the optional shutdown switch, if desired.
5. Connect the sensing input to E1 and E3/4. The sensing
should be connected "line-to-line".
Paral lel Compensation
When it is required to operate the regulator in parallel with
an isolated or utility bus, in addition to the regulator
provisions, a 2.5 VA current transformer (CT) is required
(See Figures 3 and 4). This CT is connected in a generator
line and should deliver from 3 to 5 amperes secondary
current at rated load.
The phase relationship of the CT signal to the regulator
sensing voltage must be correct or the system will not
parallel properly. The CT must be installed in the line of the
three-phase generator that does not supply sensing to the
regulator.
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9302800991
B
Instructions
03/12
2 of 4
Figures 4 and 5 show the correct CT polarity for ABC phase
CAUTION
Do not flash the field with the generator in motion.
Damage to the regulator may result.
rotation sequence. If the phase rotation sequence is ACB,
the CT secondary leads must be interchanged.
Reactive Droop Compensation
For reactive droop compensation, connect the CT to its
respective regulator as shown on Figures 4 and 5.
A unit-parallel switch shorts the parallel CT secondary to
prevent any droop signal from being injected into the
regulating system during single unit operation. The switch
may not be required on parallel droop compensation
applications where a voltage drop is not objectionable.
Reactiv e Differential Compensati on
On parallel reactive differential compensation applications a
contact should be used to short out the paralleling CT
secondary when that generator is not paralleled to the bus.
If the switch is not used, a voltage droop will be introduced
into the system. This is due to the unloaded generator
parallel CT not supplying its compensating signal, but
allowing a voltage drop to occur across it. Lack of thi s
shorting contact will also cause the voltage of the incoming
generator to fluctuate prior to paralleling. Ideally, this contact
is an auxiliary on the circuit breaker contactor that opens
when the circuit breaker is closed.
For reactive differential compensation, connect each CT to
its respective regulator. Then connect the finish of the first
CT to the start of the second CT, the finish of the second CT
to the start of the third CT, etc. Continue until all CT’s are
connected in series. The final step will be to connect the
finish of the last CT to the start of the first CT. (See Figure
5).
Reactive differential compensation cannot be used when
paralleled with the utility or any infinite bus. If this
compensation system is used, a switching circuit must be
used to convert the system to a reactive droop
compensation system. Contact the factory for additional
information.
OPERATION
The following procedures provide instructions for setting up,
starting, operating, and adjusting the AVC 63-7 Voltage
Regulator. Symptoms of problems occurring during startup
that result from incorrect regulator adjustment and certain
generator system problems that resemble faulty regulation
are included together with possible solutions.
Prel imi nary Setu p
To prevent damage to the regulator, complete the following
steps before proceeding with system startup.
1. Verify that the voltage regulator specifications conform
to the generator system requirements.
2. Ensure that the regulator has been installed and
connected in accordance with the paragraphs on
installation.
Operation at Red uc ed Speeds
During periods of prime mover idling, use the shutdown
switch to remove power from the regulator.
System Startup
1. Perform preliminary setup as described in the above
paragraphs.
2. Start the prime mover and bring up to rated speed.
Result: Voltage should build up. If not, perform field
flashing.
3. Slowly adjust VOLT adjustment or external voltage
adjust rheostat until the generator output voltage
reaches the nominal value.
4. Apply and remove load to check stability.
5. Check the regulator under normal operating conditions.
Result: If regulation is not within range, verify the prime
mover is at rated speed.
6. Reduce generator frequency to approximately 5 Hz
below nominal.
Result: Generator output voltage should decrease at
desired frequency.
Adjustments
Field Flashing.
generator for the first time, the polarity of the residual
magnetism may not be correct or of sufficient magnitude. If
the residual voltage at terminals 3 and 4 is greater than 6
Vac, replace the regulator. If generator residual voltage is
less than 6 Vac at terminals 3 and 4, shut down the prime
mover and proceed with the following steps.
1. With the prime mover at rest, apply a dc source
(ungrounded), of not more than 48 Vdc, to terminals F+
(positive) and F– (negative) in series with a limiting
resistor. Use one ohm of resistance for each volt from
the dc power source with a power rating of least one
watt per ohm.
EXAMPLE: If using a 24 Vdc source, use a 24 ohm, 24
watt resistor.
2. Allow the field to be flashed for approximately 10
seconds before removing the dc source.
3. If voltage buildup does not occur after performing steps
1 and 2, verify the polarity of the dc source used in
steps 1 and 2 and perform again.
When the regulator is operated with the
Frequency Roll-Off Adjustment
The AVC 63-7 underfrequency adjust is factory preset to
cause an average 1 volt drop in the generator's line input
voltage to the regulator when the frequency is between 54.5
and 55.5 Hz (for 60 Hz applications). For 50 Hz applications,
the frequency roll-off is factory preset to between 44 and 46
Hz. To reset the frequency roll-off, proceed as follows:
1. Adjust the prime mover rpm to the desired frequency
compensation (corner frequency roll-off) point.
2. Adjust the front panel FREQ control CW until the output
voltage starts to drop off.
3. Bring the prime mover up to rated speed. The output
voltage should return to normal.
Stability Adjustment
An oscilloscope or other voltage recording device should be
used if a stability setting is desired that will provide the
fastest possible voltage response with good generator
stability.
1. Rotation of the front panel STAB control in the
clockwise (CW) direction will slow response time.
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