When using the CL-6 Control with a CPS regulator, refer
to
Service Information S225-11-1 CL-6 Series Control
Installation, Operation, and Maintenance Instructions
for
additional information on the CL-6 regulator control.
External Check
Examine the power connections first. For example, verify
that the load lead is connected to the load bushing and
that the source lead is connected to the source bush-
ing. Check for other potential problems, such as an open
ground connection.
defining the Problem
Determine which of the following categories best describes
the malfunction and follow the corresponding steps. Refer
to the Appendix, Figures 26 through 28, while diagnosing
the problem.
Note:
If the tap-changer uses Logic Switches as part of the
Safety Switch system and a Logic Switch malfunctions,
the tap-changer is likely to only function from 16 Lower
to 2 Lower, or from 2 Raise to 16 Raise.
Note:
Parameter options, accessed via menu or function code,
are shown in
bold
.
Settings of front panel switches are shown in
bold
.
Keypad directions are shown as follows: press keys as
shown in
bold
; enter numbers as shown in
italics
.
Tap-Changer Operation
Troubleshooting
Regulator Will Not Operate Manually or
Automatically
.
Connect a voltmeter between
Tb
1
-R
1
and
Tb
1
-G
. Set
the
CONTROL FUNCTION
switch on
Manual .
2 .
Toggle the
Raise
switch and measure the voltage
between terminals
R
1
and
G
on terminal board
Tb
1
.
The voltage reading should approximate the set volt-
age setting.
3 .
Place the voltmeter hot lead on
Tb
1
-L
1
, then toggle the
Lower
switch.
4 .
Measure the voltage between terminals
L
and
G
on terminal board
Tb
1
. The voltage reading should
approximate the set voltage value.
5 .
If correct voltage readings are obtained in Steps 2 and
4, the trouble may be in the position indicator, junction
box, control cable, or motor capacitor.
6 .
If there is no voltage measurement in either Step 2 or
4, make a corresponding measurement (
R
3
to
G
and
L
3
to
G
) on lower terminal board
Tb
2
.
7 .
If the voltages measured in Step 6 are approximately
the set voltage value, then the fault is likely a loose con-
nection or a faulty terminal between
Tb
1
and
Tb
2
.
8 .
If Steps 2, 4, and 6 do not provide voltage readings,
measure the voltage between
VM
and
G
on terminal
board
Tb
2
. The reading should approximate the set
voltage value.
.
If Step 8 does not yield a voltage measurement, check
the voltage between
PD
1
-1
(
V
) and ground (
G
) at the
voltage disconnect knife switch.
A .
If the set voltage value is approximately obtained,
the
V
1
disconnect or the ratio-correcting transform-
er (
RCT
1
) of the rear-panel signal circuit is probably
faulty.
B .
If voltage is not obtained, the trouble is in the
control cable, junction box, or regulator tank. If the
junction box checks are satisfactory, the trouble
is in the regulator tank. See
Service Information
S225-10-2
and
S225-10-19
for troubleshooting
methods.
Motor Capacitor Problem
A problem with the motor capacitor can prevent a regula-
tor from operating manually or automatically. To check the
motor capacitor, use the following steps:
.
Connect a voltmeter from
Tb
1
-R
1
to
G
.
2 .
With the control powered up, place the
Auto/ Remote/
Manual
switch on
Manual .
3 .
Using the
Raise/Lower
Switch, give a
Raise
signal.
4 .
The voltmeter reading should approximate the set volt-
age.
5 .
With the voltmeter still connected to
Tb
1
-R
1
to
G
, give
a
Lower
signal.
6 .
The voltmeter should read a capacitive voltage plus run
voltage. This voltage could be somewhere between
160 and 190 V ac.
7 .
A voltage reading on
Tb
1
-R
1
to
G
of 0 V, or a mV read-
ing, is a sign of a bad capacitor.
8 .
To double check, place the voltmeter lead on
Tb
1
-L
1
to
G
.
.
Using the
Raise/Lower
switch, give a
Lower
signal.
0 .
The voltmeter reading should approximate the set volt-
age.
2
S225-10-30
!
SAFETY
FOR LIFE
TROUBLESHOOTINg
WARNING:
Hazardous Voltage. When trouble-
shooting energized equipment, protective gear
must be worn to avoid personal contact with energized
parts. Failure to comply can cause serious injury or
death.
VR-T213.0
