Removal From Service; Determining Neutral Positlon; De-Energizing The Regulator; Maintenance Program - Cooper VR-32 Installation, Operation And Maintenance Instructions

VR-32 Regulator and CL-2A Control
9. Close the LOAD (L) disconnect switch.
10. Open the BYPASS Switch.
11. Replace the 6 A motor fuse, close the V 1 knife switch [and
V 6 if present] and set the POWER switch to INTERNAL.
12. Set the AUTO/OFF/MANUAL switch to AUTO.
13. Set the VOLTAGE setting to call for one step of voltage
correction.
14. If satisfactory, call for one step of voltage correction in the
opposite direction.
15. If both operations are satisfactory, set the VOLTAGE SET-
TING control at the desired level.
PROCEDURE B: REGULATOR BYPASS
DISCONNECT SWITCH
1. Verify from the regulator nameplate that the control circuit
is connected for the proper regulated load voltage.
2. Set the AUTO/OFF/MANUAL switch to MANUAL and the
POWER switch to EXTERNAL.
3. The knife switches on the back panel should be set with
the V 1 (potential switch) [and V 6 if present] open (pulled
out), and the C (CT shorting switch) closed (pushed in).
See Figure 1-6.
4. Apply 120 volts to the EXTERNAL SOURCE terminals, if
120 volts is available. If not, proceed to Step 7, below.
5. Lift the RAISE/LOWER switch to operate the tap changer
two or three steps, then depress the RAISE/LOWER
switch to return the tap changer to neutral position.
(These steps verify the mechanism is functional.) When
on neutral, the NEUTRAL LAMP will glow and the posi-
tion indicator will point to zero.
6. Remove the 120 volts from the EXTERNAL SOURCE ter-
minals.
7. With the regulator in neutral position, set the
AUTO/OFF/MANUAL switch to OFF, set the POWER
switch to OFF, and remove the 6 A motor fuse.
8. Close the SOURCE-LOAD (SL) disconnect switch. (Delta
applications only).
9. Close the regulator bypass-disconnect switch.
10. Replace the 6 A motorfuse, close the V 1 knife switch [and
V 6 if present], open the C knife switch, and set the
POWER switch to INTERNAL.
11. Set the AUTO/OFF/MANUAL switch to AUTO.
12. Set the VOLTAGE SETTING to call for one step of volt-
age correction.
13. If satisfactory, call for one step of voltage correction in the
opposite direction.
14. If both operations are satisfactory, set the VOLTAGE
SETTING control at the desired level.

REMOVAL FROM SERVICE

Determining Neutral Position
WARNING: Closing the bypass switch with the
tap changer off neutral will short circuit part of the
series winding. Before closing the bypass switch, the
regulator must be on NEUTRAL and the control switch
set to OFF.
Return the regulator to neutral. The regulator can be safely
removed from service without interrupting load continuity only
on the neutral position. It is wise to employ more than one
method to determine whether a regulator is on neutral.
1-6
To Return The Regulator To Neutral
1. Use the control to RAISE or LOWER the regulator until it is
in the neutral position.
2. When on NEUTRAL, the NEUTRAL LAMP will light and the
POSITlON INDICATOR will point to zero.
3. To stop the regulator on the neutral position, the CONTROL
switch should be turned to OFF during the switching opera-
tion from position "1 " to position zero. Switching to OFF
prior to reaching the neutral position prevents overshoot.
4. The POSITlON INDICATOR and NEUTRAL LIGHT MUST
BOTH indicate neutral.
WARNING: A regulator should be bypassed with
the line energized ONLY if BOTH the position indi-
cator AND the neutral light indicate NEUTRAL. If both do
not indicate NEUTRAL, the line should be de-energized
to avoid shorting part of the series winding.
WARNING: Always use the CONTROL switch
(labeled AUTO/REMOTE-OFF-MANUAL) to oper-
ate the regulator, not the POWER switch. Failure to do
so may result in the tap changer stepping off of neutral
immediately upon being energized.

De-energizing The Regulator

Once it has been established that the regulator is on neutral,
immediately proceed with the following steps:
1. Turn the CONTROL switch to OFF.
2. Turn the control POWER switch to OFF.
3. Open the V 1 knife switch (and V 6 if present) on the back
panel (Figure 1-5).
4. Remove the 6A motor fuse.
5. Close the BYPASS switch.
6. Open the SOURCE(S) disconnect switch.
7. Open the LOAD (L) disconnect switch.
8. Open the SOURCE-LOAD (SL) disconnect switch. (Delta
application only.)
Note: If a regulator bypass disconnect is used in place of
three separate switches, steps 5, 6, and 7 are carried out in
one operation.

MAINTENANCE PROGRAM

Periodic Inspections
Step-type voltage regulators are designed to provide many
years of trouble-free operation. Proper operation of the regula-
tor can be checked without removing the unitfrom service.
Using the manual mode of operation, run the regulator several
steps in the raise direction, and then turn the control back to
auto. After the time delay programmed into the control expires,
the regulator should return within bandwidth (which will nor-
mally be the same position you started from, unless the incom-
ing voltage is currently varying). When this has been complet-
ed, use the manual mode of operation to run the regulator sev-
eral steps in the lower direction, and then turn the control back
to auto. After the time delay, the regulator should return back
within bandwidth.
If the regulator will not operate properly, a substitute control
can be tried before removing the unit from service. Refer to
the following sections for proper procedures on removing and
replacing the CL-4C Control.