Removal Of Cl-2A Front Panel; S225-10-5; Replacement Of Cl-2A Front Panel; Untanking The Regulator - Cooper VR-32 Installation, Operation And Maintenance Instructions

Since the usable life of a regulator is affected by its applica-
tion, it may be desirable to periodically remove the regulator-
from service and untank the unit to verify contact wear, oil
dielectric, etc. The time for this will vary, depending on a spe-
cific user's past experience.

Removal of CL-2A Front Panel

The CL-2A front panel may be removed from the regulator
with the regulator energized.
To open the front panel, unscrew the panel locking screw on
the left side of the panel. This allows the control to swing open
on its hinges. With the control open, the back panel is readily
accessible. The design of the control enclosure, back panel,
and front panel enable easy replacement of the front panel,
leaving the back panel, control enclosure, and cable intact. To
remove the front panel, proceed as follows:
1 . Push closed the current shorting switch, C. This shorts
out the secondary of the regulator C.T.
WARNING: Push the C shorting switch closed
before attempting to remove the fanning strip.
Failure to do so will open the regulator CT circuit and
may produce a flashover on the control.
2. Pull open the disconnect switch, V 1 (and V 6 if present).
This de-energizes the CL-2A front panel.
3. Loosen the screws on the interconnecting terminal strip
(TB2) at the bottom of the back panel.
4. Pull the fanning strip free from the terminal strip.
The CL-2A can now be lifted off its hinges. Care should be
taken to prevent damage to the CL-2A front panel while in
transit and/or storage.

Replacement of CL-2A Front Panel

To replace a CL-2Afront panel in the control enclosure, follow
the procedure outlined below:
1. Engage the front panel on the enclosure hinges.
2. Insert the fanning strip from the front panel wiring harness
under the TB2 terminal block screws, matching terminal
indentification.
3. Tighten the screws on the interconnecting terminal block.
4. Push closed the disconnect switch, V 1 (and V 6 if present).
5. Pull open the current shorting switch, C.
6. Close the panel and tighten panel locking screw.

Untanking The Regulator

1. Manually run the tap changer to neutral, if possible. If not
possible, note position indicator reading before proceed-
ing to untank.
2. Remove the two mounting bolts holding the control cabi-
net to tank.
3. Remove the series arrester. Release internal pressure
using the pressure relief device on the side of the regula-
tor.
4. Free cover by removing clamping ring or cover bolts.
5. Attach sling or hooks with spreader bar (Figure 1-7) to lift-
ing eyes and raise the cover, with the attached core-and-
coil assembly, until the top of the coil is approximately
one inch under oil. The control cabinet should be guided
to avoid snagging during lifting.
CAUTION: Before intanking a fan-cooled regula-
tor, (1) lower the oil level below the thermometer,
then (2) remove the thermometer will. Failure to do so will
result in damage to the thermometer will and/or spillage
of oil when the internal assembly is lifted.
Figure 1-7.
Untanking.
It is recommended that the main core-and-coil assembly never
be removed from the oil, except when a winding failure occurs.
Blocking between the cover and tank lip should be employed to
suspend the core-and-coil assembly within the oil until inspection
of the tap changer or other maintenance is complete.

Retanking The Regulator

Retank
the regulator as follows:
1. Be sure the position indicator shows the present position of
the tap changer. If not, remove the indicator cable in the
junction box from the position indicator shaft after loosening
the set screw. Rotate the indicator shaft until the proper posi-
tion is reached, then tighten the set screw. Verify coordina-
tion of position indicator with tap changer in neutral position
(control neutral light on).
2. Check the gasket seat surfaces on the cover and tank, and
wipe clean. Wipe the gasket and position it on the tank lip.
Loosen horizontal side channel bolts to insure proper seat-
ing of regulator in tank and cover seal.

S225-10-5

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