Rockwell Automation 1502 400 Amp Medium Voltage Contactor (Series D) - Manual (Page 46)

4-18 Maintenance
1502-UM050D-EN-P – June 2013
Mechanically Latched Contactor
1. The overtravel, contact gap and auxiliary set-up procedures are the same
Set-Up Procedure
for mechanically latched contactors as they are for electrically held contactors
except that instead of energizing the contactor with the “TEST” circuit, the
contactor must be held closed mechanically by means of a clamp or special
fixture as shown in Figure 4.23. It is important that the contactor is held
closed tightly with the armature against the magnet cores when gauging the
overtravel, contact gap, and auxiliary positioning. Allen-Bradley part
number 80154-149-51 is recommended, however, a C-clamp can be used
at the rear of the contactor to pull up the actuator plate (care must be taken
not to overtighten the C-clamp and bend the actuator plate).
Mechanically Latched
Contactor Clamping Fixture
Mechanically Latched
Contactor Clamping Fixture
Figure 4.23 – Clamping a Mechanically Latched Contactor Closed
2. Clamp the contactor closed as detailed in Step 1. The latch mechanism
should be in place with the mounting bolts loose enough to allow sliding
along the adjustment slots.
3. With the contactor lying on its back, insert an .015 in. (0.38 mm) feeler
gauge between the latch roller and the armature plate as shown in Figure
4.24. Tighten the mounting bolts (do not overtorque 1/4 inch nuts or 5/16
inch bolts).