Rockwell Automation 7000A PowerFlex Medium Voltage Drive (A-Frame) - Classic Control - Manual (Page 318)

6-14 Component Definition and Maintenance
7000A-UM150F-EN-P –June 2013 7000 “A” Frame
Location of 7.2 kV fuses
Location of ground
Connecting Links
Varistors
Figure 6.13 –Transient Suppression Network – 6600 V
Varistor Replacement
Varistors are part of the Transient Suppression Network located within the
converter cabinet. The “A” Frame drive contains one varistor panel.
1. Ensure there is no power to the equipment.
A T T E N T I O N A T T E N T I O N To prevent electrical shock, ensure the main
power has been disconnected before working
on the transient suppression network. Verify
that all circuits are voltage free using a hot stick
or appropriate voltage-measuring device.
Failure to do so may result in injury or death.
2. Observe the locations of the connecting links.
3. Detach the connecting links by removing the screws.
4. Using a screwdriver remove the screws at the base.
5. Replace the varistor (polarity is not an issue).
6. Continue by replacing the screws and connecting links.
Important: Each varistor panel is grounded. Ensure that one varistor
(see Figures 6.12 and 6.13 for location) is connected to the grounding lead.
Transient Suppression
Network – TSN (cont.)