Allen-Bradley 1512B, User Manual

Page: 58 / 108

58 Rockwell Automation Publication 1500-UM055I-EN-P - December 2021
Chapter 4 Maintenance
Figure 52 - Clip-on Style Medium Voltage Power Fuse
Contactor Maintenance
Refer to publication 1502-UM060 for contactor maintenance instructions.
Removing the Contactor
1. Complete the Power Lock-out Procedure (refer to Power Lock-out
Procedure on page 53 ).
2. Disconnect the control wiring harness from the wire plug at the lower
left side of the contactor (See Figure 53 )
3. Remove the control power transformer primary fuses from the top of the
contactor.
4. Disconnect the control power transformer primary leads from the fuse
terminals at the top of the contactor.
5. Use a 9/16-in. socket wrench to disconnect the power cables and bus bars
from the rear of the contactor.
6. Remove the nylon contactor bushing 1/4-20 retaining-screw (12 lb•ft
[15 N•m]) retaining screw from the contactor interlock lever.
7. Slide the contactor interlock rod and the nylon contactor bushing out of
the groove in the contactor interlock lever (see Figure 54 ).
‡ ‡
‡
Flare
Blown Fuse Indicator
(shown in blown state)
ATTENTION: To avoid shock hazards, lock out incoming power (refer
to Power Lock-out Procedure on page 53 ) before working on the
equipment. Verify with a hot stick or appropriate voltage measuring
device that all circuits are voltage free. Failure to do so may result in
severe burns, injury or death.