Rockwell Automation 1502 400 Amp Medium Voltage Contactor (Series D) - Manual (Page 47)

Maintenance 4-19
1502-UM050D-EN-P – June 2013
0.010 in. [0.25 mm]
Insert feeler gauge here.
0.010 in. [0.25 mm]
Insert feeler gauge here.
Figure 4.24 – Gauging Mechanical Latch Location
4. With the contactor still clamped, depress the latch lever and release
allowing it to spring up. Ensure smooth, unimpeded motion.
5. Remove the clamp and allow the armature to move out against the roller
such that the contactor is in the “latched” condition.
The return springs exert a significant force on the armature
plate. To avoid injury, do not place fingers between the
armature plate and the stop bracket at any time.
6. Using the manual trip lever, trip (drop out) the contactor. Apply 2 to 3 lb. of
force to trip the contactor. If too little force is required, the mechanism
must be moved away from the armature slightly (toward the front of the
contactor). If too great a force is required, the mechanism must be moved
toward the armature slightly (toward the back of the contactor). If adjust-
ment is required, the contactor must be clamped closed and the set-up
procedure repeated with thicker or thinner feeler gauges as required.
Important: This is a sensitive and critical set-up. A few thousandths of an
inch makes a noticeable difference in the function of the latch. A mechanism
which trips too easily may result in nuisance tripping. A mechanism which
requires too much force may result in failure of the coil to trip the latch.
A T T E N T I O N A T T E N T I O N