Rockwell Automation 1500 Isolation Switch Handle Interlock Mechanism Engagement Replacement - Manual (Page 3)

Bulletin 1500/1900 Isolation Switch Handle – Interlock Mechanism Replacement 
1500-IN052C-EN-P – January 2007
Grounding Bar
Isolation Switch Blades
must fully engage Grounding
Pins of Grounding Bar.
(Verify for each phase)
Isolation Switch Shutters
must be closed.
(Verify for each phase)
Figure  – Inspecting Isolation Switch in Open Position
6) Check the line and load sides of the contactor with a hot stick or appropriate voltage
measuring device for the system voltage, to verify that they are voltage free (see
Figure 3).
a) Check for line-side voltage at the top vacuum bottle terminals.
b) Check for load-side voltage at the bottom vacuum bottle terminals.
Check line-side power here
Check load-side power here
Figure 3 – Contactor Voltage Checkpoints
7) Use the Door Interlock Circumvention procedure described in Appendix A to move
the isolation switch handle to the ON position
8) Check the isolation switch blades with a hot stick or appropriate voltage measuring
device for the system voltage, to verify that they are voltage free (see Figure 4).