Rockwell Automation 1502 400 Amp Medium Voltage Contactor (Series D) - Manual (Page 35)

Maintenance 4-7
1502-UM050D-EN-P – June 2013
9. The contact gaps must be synchronized within 0.02 in. (0.5 mm). If the
gaps are not synchronized, rotate the insulators as required to achieve this.
Make sure the overtravel remains a minimum of 0.065 in. (1.65 mm) on
each bottle.
10. Tighten the load terminal nut on each bottle assembly. To do this without
damaging the bellows, apply wrenches to the load terminal nut and to the
flattened section of the movable bottle shaft. Tighten the load terminal nut
while holding the bottle shaft steady. Be careful not to turn the insulator
as this will change the gap.
11. The final contact gap for all three bottles must be between 0.180 in. and
0.200 in. (4.57 mm and 5.08 mm). If this is the case, the replacement
procedure is complete. If further adjustment is required, all three gaps can
be adjusted simultaneously by loosening the stop bracket bolts and
adjusting the height of the gap adjustment screw at the rear of the
contactor as shown in Figure 4.9. To adjust the height of the screw, first
loosen the locking nut.
12. When the gap is correct, tighten the gap adjustment screw locking nut.
Position the stop bracket lightly against the armature plate and tighten the
bolts securing the stop in position. Make sure that the actuator plate contacts
the gap adjustment screw and the armature plate contacts the stop bracket as
shown in Figure 4.9.
Stop Bracket Bolts
Gap Adjustment Screw
Gap Adjustment Screw
Locking Nut
Stop Bracket
Stop Bracket Bolts
Gap Adjustment Screw
Gap Adjustment Screw
Locking Nut
Stop Bracket
Figure 4.9 – Contact Gap Adjustment