Power Systems AVC63-4A User manual

Publication: Rev First Printing 09/01 Copyright
9 2858 00 991 -Revised 2001
Basler Electric
Phone [phone]
Route 143 Box 269
Highland IL 62249 USA
Power Systems Group
Fax [phone]
http://www.basler.com
[e-mail]
INSTRUCTIONS
FOR
VOLTAGE REGULATOR
AVC63-4A
9 2858 00 102
INTRODUCTION
The AVC63-4A Voltage Regulators are
designed for use on 50/60 Hz brushless
generators. The regulator includes frequency
compensation, over-excitation shutdown, a
solid-state buildup circuit, and EMI filtering.
ELECTRICAL SPECIFICATIONS
Dc Output Power:
4 Adc at 63 Vdc (252 W) maximum
continuous,
7 Adc at 100 Vdc (700 W) forcing one minute
(at 120 Vac input).
9 Adc at 134 Vdc (1206 W) forcing for 10 sec-
onds (at 153 Vac input).
Exciter Field Dc Resistance:
15 ohms, minimum; 100 ohms maximum.
AC Power Input:
Operating range: 95 Vac to 139 Vac, ±10%;
Single phase, 50/60 Hz; Burden: 450 VA.
Sensing Input:
95-139 Vac, ±10%, or 190-277 Vac, ±10%,
single phase, 50/60 Hz.
Regulation Accuracy:
Better than ±1.0% no load to full load.
Response Time:
Less than 1.5 cycles for ±5% change in
sensing voltage.
EMI Suppression:
Internal electromagnetic interference (EMI)
filter.
Overexcitation Shutdown:
Field voltage shuts down after time delay if
exciter field voltage exceeds 95 Vdc, ±5%.
(See
Overexcitation Shutdown
for inverse
time delay curve and description).
Voltage Buildup:
Internal provisions for automatic voltage
buildup from generator residual voltages as
low as 6 Vac.
Power Dissipation:
15 Watts maximum.
Terminations:
1/4 inch "Fast-On" terminals.
PHYSICAL SPECIFICATIONS
Operating Temperature:
-40 ° C to +60 ° C (-40 ° F to +140 ° F).
Storage Temperature:
-40 ° C to +85 ° C (-40 ° F to +185 ° F).
Vibration:
Withstands 1.2 Gs at 5 to 26 Hz; 0.036"
double amplitude at 27 to 52 Hz; and 5 Gs at
53 to 1000 Hz.
Shock:
Withstands up to 20 Gs in each of three
mutually perpendicular axes.
Weight:
10 oz. (0.28 kg) Net.
FUSES
Although the AVC63-4A has an internal fuse,
it is recommended that fuses with high
interruption capability be installed per the
interconnection diagram to protect wiring from
faults before the regulator. A spare fuse is
included with the AVC63-4A (internal fuse). It
is mounted "piggy-back" to the original fuse.
Refer to the
Outline Diagrams.
NOTE
Fuse must be installed per the inter-
connection diagrams to avoid inter-
rupting the field current.
AVC63-4A Outline Diagram (Top View)
AVC63-4A Outline Diagram (Side View)
V/HZ "CORNER FREQUENCY" SELECTION
AND ADJUSTMENT
For 60 Hz systems, the regulator is preset at
the factory for a 55 Hz "corner frequency.”
For 50 Hz systems, a 45 Hz "corner
frequency" is achieved by connecting a
jumper across terminals HZ1 and HZ2.
The corner frequency can be adjusted by the
UF ADJ rheostat on the AVR. Clockwise
rotation results in raising the corner
frequency (shifting the curve to the right). To
set the UF rheostat:
1. Adjust the UF Rheostat fully CCW.
2. Start the generator and set at rated
voltage.
3. Adjust the generator frequency to the
desired kneepoint frequency.
4. Slowly adjust the UF ADJ rheostat
clockwise (CW) until the generator voltage
just begins to decrease.
Frequency Compensation Curves
OVEREXCITATION SHUTDOWN
Overexcitation shutdown is included that re-
moves the output power if the exciter field
volt-age exceeds 95 Vdc. If exciter field
voltage exceeds 95 Vdc ±5%, the regulator
automatically removes field current, after a
time delay. The time delay is inversely
proportional to the magnitude of the detected
overvoltage condition. At 134 Vdc, the field
voltage is removed after approximately 10
seconds. Refer to the following figure.
Typical Time Delay Characteristic Curves

After output power is removed, the regulator
can be reset by decreasing the input voltage
to less than 6 Vac for a minimum of 2
seconds. This may be accomplished by
stopping the prime mover or by interrupting
the regulator input with a reset switch.
STABILITY ADJUST RHEOSTAT (STAB)
An internal screwdriver-adjustable potent-
iometer provides adjustment to the response
rate of the generator output voltage to a
change in load. Clockwise rotation of this ad-
justment provides an increase in the response
time and therefore decreases the amount of
voltage overshoot thereby increasing stability.
Counterclockwise rotation of this adjustment
provides a decrease in the response time
(faster response time) and therefore increases
the amount of voltage overshoot providing
decreased stability.
OPERATION
The following system operation procedures
provide instructions for adjusting the AVC63-
4A voltage regulator. Symptoms resulting
from a faulty regulator and certain generator
system problems are included, together with
suggested remedies.
Complete the following steps before
proceeding with the system startup.
CAUTION
Meggers and high potential test
equipment must not be used. Incorrect
use of such equipment could damage
the semi-conductors contained in the
regulator.
PRELIMINARY SETUP
1. Verify that the voltage regulator
specifications conform with the generator
system requirements.
2. Ensure that the regulator wires are as fol-
lows:
a) If the remote voltage adjust rheostat is
not to be connected, ensure terminals
6 and 7 are shorted with a jumper.
b) If a 55 Hz "corner frequency" for 60
Hz systems is desired, ensure that the
HZ1 and HZ2 terminals are open. If a
45 Hz "corner frequency" for 50 Hz
systems is desired, ensure that the
HZ1 and HZ2 terminals are shorted
together with a jumper.
c) For 120 V nominal sensing, ensure that
terminals V1 and V2 are not
connected. For 240 V sensing,
ensure that terminals V1 and V2 are
connected together.
3. Ensure the voltage regulator is correctly
connected to the generator system.
4. Install the fuses as described in
Fuses .
5. Set the regulator Voltage Adjust
Rheostat (Var) and external Var (if
used) as follows:
Switch Initial Setting
Regulator VAR Fully CCW
Remote VAR Centered
SYSTEM STARTUP
1. Perform preliminary setup as described
in the above paragraphs.
NOTE
All voltage readings are to be taken
with an average-reading voltmeter.
2. Start the prime mover and bring it up to its
rated speed.
RESULT: Voltage should build up. If not, per-
form field flashing.
3. Slowly adjust the regulator Var CW until the
generator output voltage reaches the
nominal value. If used, adjust the remote
Var to set the generator voltage to the
exact value de-sired.
RESULT: Voltage should build up to its rated
value. If voltage does not build up to rated
value, check the generator for a short or
excessive load.
4. Check regulator under normal operating
and loading conditions.
RESULT: Voltage regulation should be better
than ±1.0% no-load to full-load. If regulation is
not within this range, perform the following
steps:
1. Voltage reduction under load may be due
to a speed change from no load to full load
causing the frequency compensation
(V/Hz) circuit to reduce voltage at lower
frequencies.
2.Replace the voltage regulator.
OPERATIONAL TEST
1. Connect the test setup as shown in the fol-
lowing figure,
Operational Test . Do not
apply power. Ensure that the light bulb is
rated for 120 V and is less than 100 W.
2. Adjust the regulator Var and/or remote Var,
and the STABILITY Adjust to maximum
CCW.
3. Apply 120 V, 50/60 Hz power to the
regulator. The light bulb should illuminate.
4. Slowly adjust the regulator Var control CW.
At the regulation point, the light bulb should
extinguish. Small adjustments above and
below this level should cause the light bulb
to go off and on. Note that the light bulb
goes on and off rapidly.
5. Rotate the STABILITY ADJ fully CW. Now
adjust the regulator Var above and below
the regulation point. The light bulb should
still go off and on but the transition from off
to on (and vice versa) should be much
slower than in the paragraph above.
The following notes (∆) apply to the intercon-
nection and operational test diagram:
1. If external pot is not used, short terminals 6
and 7.
2. Short terminals HZ1 and HZ2 and leave
open for 60 Hz.
3. Item not supplied by Basler Electric.
4. For 120 V Nominal sensing, make no con-
nection to terminals V1 and V2.
For 240 V Nominal sensing, short terminals
V1 and V2 together.
5. Select fuses with a high interrupting
capacity.
6. If glass type fuse is used, enclose for
safety.
Interconnection Diagram, 277/480 V Nominal, 3-Phase 4-Wire Wye Interconnection Diagram, 120/208 V Nominal, 3-Phase, 4-Wire, Wye
Connection Connection

Interconnection Diagram, 120/240 V Nominal, 1-Phase, 3-Wire
Operational Test