Rockwell Automation Publication 1500-UM055I-EN-P - December 2021
69
Chapter 4 Maintenance
Isolation Switch Auxiliary
Contacts
The auxiliary contacts are mounted on the left side of the isolation switch,
slightly below the cams on the isolation switch shaft.
Normally open contacts (Isolation Switch a Contacts - ISa) are on the outside
of the isolation switch housing, and normally closed contacts (Isolation Switch
b Contacts - ISb) are on the inside of the housing.
Figure 65 - Location of ISa and ISb Auxiliary Contacts
ISa and ISb contacts are exactly the same (700 CPM). The cam controls the
normally open or normally closed status of the contacts.
Refer to
and
for wiring diagrams.
Adjusting the Normally Open (ISa) Contacts
1. Move the isolation switch handle to the OFF (open) position.
2. Loosen the bolt holding the outside cam to the shaft. Do not loosen the
bolt entirely. The cam should not be able to rotate freely on the shaft.
3. Move the isolation switch handle to the ON (closed) position and check
that nothing prevents cam from rotating with the shaft.
4. Insert a 6.35 mm (0.25 in.) diameter pin into the cam groove between the
cam follower and the end of the cam groove.
ISa Auxiliary
Contacts (N.O.)
ISb Auxiliary Contacts (N.C.)
IMPORTANT
The Isolation Switch Ground Adjustment procedure (refer
Isolation Switch Mechanism Grounding Adjustment on page 67
)
must be completed before adjusting the auxiliary contacts to
ensure proper synchronization of the assembly.
ATTENTION:
To avoid shock hazards, lock out incoming power (refer
Power Lock-out Procedure on page 53
) before working on the
equipment. Verify with a hot stick appropriate voltage measuring
device that all circuits are voltage free. Failure to do so may result in
severe burns, injury or death.
Summary of Contents for 1512B
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Page 76: ...76 Rockwell Automation Publication 1500 UM055I EN P December 2021 Chapter 5 Spare Parts Notes...
