Rockwell Automation 1512A MV Controllers - 800A One-High Cabinet - Manual (Page 52)

5-4 Maintenance
1512A-UM102B-EN-P – June 2013
e) Electrically operate the contactor by pushing the START but-
ton on the unit or at a remote location.
f) Disengage the contactor and move the control switch to the
OFF position. Disconnect the external power supply.
g) Complete the Power Lockout procedure
4) Open the medium voltage door.
5) Visually inspect that the isolation switch blades fully engage the
grounding pins on the grounding bar. The isolation switch shutters
should be closed (see Figure 5.3).
Figure 5.3 – 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 5.4).
a) Check for line-side voltage at the top vacuum bottle terminals.
b) Check for load-side voltage at the bottom vacuum bottle termi-
nals.
Power Lock-out Procedure (cont.)