2 .
If correct voltage readings are obtained in steps 9 and
11 above, the trouble is in the regulator tank. Refer to
the
Troubleshooting
section of
Service Information
S225-10-2
.
3 .
If there is no voltage measurement in either step 9 or
11, the problem is in the limit switches inside the posi-
tion indicator or in the control cable.
4 .
Check the continuity of the raise and lower limit switch-
es. The switches should be closed on all tap-changer
positions except for the set-limit switch positions of the
indicator dial. To check the continuity:
A .
Remove position indicator green-black lead from
splice terminals.
B .
Place the meter lead on the disconnected lead
and the other lead on terminal
L
of the junction box
terminal board. Then check continuity.
C .
If a continuity problem occurs, refer to the
Position Indicator Replacement
section.
D .
Remove the position indicator blue lead from the
splice terminal.
E .
Place the meter lead on the disconnected lead
and the other lead on terminal
R
of the junction
box terminal board. Check continuity.
F .
If a continuity problem occurs, refer to the
Position Indicator Replacement
section.
5 .
Check the reset solenoid of position indicator. Depress
the drag-hand reset switch while measuring the volt-
age between
DHR
and
G
on the terminal board. The
voltage reading should be approximately 120 V ac and
drag hands will reset.
6 .
If 120 V is read and drag hand will not reset, refer to the
Position Indicator Replacement
section.
7 .
If 120 V is not read, refer to the
Control Panel
Troubleshooting
section.
Metering Troubleshooting
Load Voltage Secondary (Output Voltage)
does Not Match the Voltmeter Test
Terminal Voltage
When the output voltage at FC 6 is several volts different
from what the voltmeter test terminals read, check and
verify the following function codes and settings for proper
setting per the name plate.
.
Verify FC 43, System Line Voltage (Load Voltage) is set
per nameplate value.
2 .
Verify FC 44, Overall PT Ratio is set per nameplate.
3 .
Verify
RCT
Control Tap located on the back panel of
the control assembly is set per the nameplate.
4 .
Verify Control Winding
E
Tap and Differential Transformer
P
Taps, if present, are set per nameplate.
E
taps are
located on the terminal board on the tap-changer
inside the tank.
P
taps are located on the terminal
board on the top of the tap-changer or on a differential
potential transformer located on the side channel inside
the regulator tank.
When all the settings are set per the nameplate, the regula-
tor is in neutral, and the system line voltage or load volt-
age is what is stated on the nameplate, the voltmeter test
terminals on the control panel will read the value per the
nameplate.
No Load Current
When there is no load current reading at FC 9, Load Current,
Primary, or any of the metering components requiring cur-
rent as part of the calculation, check the
C
switch on the
back panel. The switch should be open. If the
C
is closed,
the current transformer is shorted and no current reading
is available.
Regulator Will Not Tap Beyond a Certain
Tap Position
If the regulator will not tap beyond a certain tap position
and the position indicator limit switches setting are at 16
raise and 16 lower, check the SOFT-ADD-AMP settings: FC
175, SOFT-ADD-AMP High Limit, and FC 176, SOFT-ADD-
AMP Low Limit.
VR-32 Voltage Regulator Installation, Operation, and Maintenance Instructions
32
