Allen-Bradley 1512B, User Manual

Page: 67 / 108

Rockwell Automation Publication 1500-UM055I-EN-P - December 2021 67
Chapter 4 Maintenance
If the angle is incorrect, repeat steps 5 through 7 until desired travel angle is
reached.
Isolation Switch Mechanism
Grounding Adjustment
1. Complete the Power Lock-out Procedure (refer to Power Lock-out
Procedure on page 53 ).
2. Inspect the grounding of the isolation switch blades. When the isolation
switch handle is in the OFF position, the isolation switch blades must
fully engage the grounding pins and be within 1.5 mm (0.06 in.) of the
ground bar (see
Figure 63 ). When the isolation switch handle is in the ON
position, the blades must fully engage the incoming line stabs.
Figure 63 - Isolation Switch Grounding Adjustment
3. To adjust the distance from the blades to the bar, disconnect the
threaded connecting rod at the handle operating lever.
4. Turn the threaded connecting rod to lengthen or shorten it. This will
adjust the position of the isolation switch blades in the ON and OFF
position.
ATTENTION: All three isolation switch linkage assemblies must meet
the angle tolerance requirements.
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 other appropriate voltage
measuring device that all circuits are voltage free. Failure to do so may
result in severe burns, injury or death.
Ground Bar
Maximum Gap 0.06 in. (1.5 mm) between ground
Bar and Isolation Switch in open position
Isolation Switch Blade
Incoming Line Stab
Auxiliary Contact