Rockwell Automation 1512A MV Controllers - 800A One-High Cabinet - Manual (Page 67)

Maintenance 5-19
1512A-UM102B-EN-P – June 2013
Adjusting the Normally Open (ISa) Contacts
To avoid shock hazards, lock out incoming power
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.
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 hand to the ON (closed) position and
check that nothing prevents cam from rotating with the shaft.
4) Insert a 0.25 in. (6.35 mm) diameter pin into the cam groove
between the cam follower and the end of the cam groove.
Figure 5.17 – Adjusting Auxiliary Contacts (Isa Auxiliary Contact Shown)
5) Adjust the cam on the shaft so that the gap from the cam follower to
the end of the cam groove is the width of the pin – 0.25 in. (6.35 mm).
6) Move the isolation switch handle to the OFF (open) position and
check that nothing prevents the cam from rotating with the shaft.
7) Tighten the bolt holding the cam to the shaft. Move the isolation
switch handle to the ON position and recheck the gap using the pin.
8) Verify that auxiliary contact ISa is open when the isolation switch is
open. Verify that ISa contact is closed when isolation switch is closed.
Isolation Switch Auxiliary Con-
tacts
A T T E N T I O N A T T E N T I O N