Rockwell Automation 1503 OEM Starter Frame Components Installation Manual - Manual (Page 45)

1503-IN050e-EN-P – June 2013
Adjustments 3-11
Adjusting the ‘Change of State Point’
This procedure sets the secondary electrical interlock.
When properly adjusted, the electrical interlock is
designed to open the control circuit power connections
before the isolation switch opens when the handle is
moved to the OFF position.
1) Once the auxiliaries have been adjusted, move the isolation switch
handle to the ON position.
2) Connect a conductivity measuring device across the closed auxiliary
contacts.
3) Slowly move the isolation switch handle towards the OFF position and
observe the point at which the movable isolation switch blades separate
from the incoming line stabs. The auxiliary contacts must change state
from the closed to open position before the isolation switch blades lose
contact with the incoming line stabs. This prevents the isolation switch
from being opened while the unit is energized and under load condi-
tions.
The auxiliary contacts must be properly adjusted to
avoid opening the isolation switch under load conditions.
Improper adjustment may result in damage to the
equipment and/or severe burns, injury or death to
personnel.
4) If the auxiliaries do not change state before the isolation switch opens,
adjust the threaded connecting rod as described in the Isolation Switch
Adjustment procedure (see page 3-7).
A T T E N T I O N A T T E N T I O N
I M P O R T A N T I M P O R T A N T