Basler Electric VR63-4A/UL - Manual (Page 2)

Publication
9166800995
Revision
E
Instructions
Date
03/11
Page
2 of 4
For sensing, single-phase voltage from the generator is
connected between E1 and E4. Note that terminal 4 is
common to both power and sensing.
Fuses
It is recommended that 7 A, 250 V fuses with a high
interruption capability be installed per the interconnection
diagram in Figures 4 and 5.
CAUTION
Fuses must be installed per the interconnection
diagram to avoid interrupting field current
directly.
Voltage Adjust Rheostat (VAR)
The VAR control adjusts generator output voltage. Turning
the control clockwise increases voltage.
When using the remote voltage adjust rheostat (VAR), the
VAR wire on the regulator should be cut and the rheostat
connected to both ends. A 1 kΩ, ½ W resistor is adequate
for most applications. See Figures 4 and 5.
Accessory Equipment
Voltage Adjust Rheostat with a locking, slotted shaft for
remote mounting - Basler P/N 17724.
OPERATION
The following procedures are provided for VR63-4A/UL
setup and adjustments.
CAUTION
Meggers and high-potential test equipment
must not be used. Incorrect use of such equip-
ment could damage the semiconductors
contained in the regulator.
Preliminary Setup
1. Verify that the voltage regulator specifications
conform with the generator system requirements.
2. Ensure that the regulator is connected to the
generator correctly. See Figures 4 and 5.
3. Install fuses per Mounting, Fuses.
4. Set the regulator VAR control fully CCW and the
remote VAR (if used) to the center position.
System Startup
1. Start the prime mover and bring up to rated speed.
Voltage should build up. If a minimum residual of
6 Vac is not present, perform field flashing.
2. Slowly adjust the VAR control CW until the generator
output voltage reaches nominal value. If used, adjust
the remote voltage adjust to set the generator output
to the exact value desired.
Adjustments (Field Flashing)
When the regulator is operated with the generator for the
first time, the polarity of residual magnetism may be
reversed or too small to achieve the necessary buildup
voltage for the regulator. If reversing the field connections
does not induce buildup, and the residual voltage is still
less than the specified value of 6 Vac, shut down the
prime mover and proceed with the following steps.
1. With the prime mover at rest, apply a dc source (not
grounded) of not more than 12 Vdc with Positive to F+
and Negative to F–, in series with a current-limiting
resistor of 3 to 5 ohms.
2. Allow approximately three seconds before removing
the dc source.
3. Start the prime mover and measure voltage at
regulator leads 3 and 4. If this voltage is greater than
6 Vac, voltage buildup should be successful. If less
than 6 Vac is measured, repeat the field flashing
procedure.
4. If repeating steps 1 and 2 does not result in generator
buildup, and the residual is greater than 6 Vac,
replace the voltage regulator.
OPERATIONAL TEST
1. Connect the test setup as shown in Figure 6. Do not
apply power. Ensure that the light bulbs are rated for
120 V and less than 100 W.
2. Adjust the VAR and/or remote VAR fully CCW.
3. Apply 240 Vac, 60 Hz power to the regulator.
4. Slowly turn the VAR control in the CW direction.
RESULTS:
a. Before the fully CW position is reached, the
light bulb should reach full brightness to
signify the regulator is controlling correctly.
b. At this regulating point, a small change in the
VAR adjustment should result in the light
bulb turning fully on or off.