MAINTENANCE
14.6
Isolation Switch Maintenance
W
WARNING
Do not operate the switch while current is flowing (motor or capacitor).
The isolation switch is designed for use in any MVS panel and it is not designed for outdoor use. The
isolation switch must be installed with a breaker or similar device on the supply side to limit the prospective
fault energy. Fuses must be used on the motor side of the switch.
1.
Isolate the power supply before beginning any work on the
isolation switch.
2.
Inspect the switch contacts for signs of wear. If there is
evidence of wear, contact your local supplier for replacement
parts.
3.
Check that the microswitch activates when removing the
isolator locking pin.
4.
With the switch in the closed position check the contact
resistance for each pole of the switch.
5.
Use a lint-free cloth to clean the isolation switch. Warm
soapy water may be necessary in cleaning.
6.
Wipe the main contacts and main arms with Electrolube
(Electrolube part # CG35A) at points of contact.
07449
.B
Adjust to less than 60
(micro ohms)
14.7
Isolator Microswitch Adjustment
If the microswitch does not activate correctly, adjust the position of the plunger.
1.
Remove the isolation switch handle and the MVS panel front cover.
2.
Adjust the position of the microswitch bracket by turning the adjusting screws.
The plunger must be horizontally aligned with the centre of the locking pin tube.
The end of the plunger must be approximately 8 mm from the edge of the locking pin tube.
16776.
A
B
A
C
D
8 mm
2
1
3
A
Front cover and handle in place
B
Front cover and handle removed
C
Microswitch location
D
Microswitch detail
1
Bracket
2
Adjustment screws
3
Plunger
710-13937-00C
MVS Panel User Manual
79
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