Rockwell Automation 7000 PowerFlex Medium Voltage AC Drive (B Frame) - ForGe Control - Manual (Page 189)

Rockwell Automation Publication 7000-UM202B-EN-P - June 2014 189
Meggering Appendix D
Voltage Sensing Boards
a. Securely reconnect the two ground conductors on the VSBs.
The two ground connections on the VSB provide a reference point for
the VSB and enable the low voltage signal to be fed to the SCBs. If you
do not connect the ground conductor, the monitored low voltage signal
could then rise up to medium voltage potential, which is a serious
hazard to avoid at all times. Always ensure the ground conductors on
the VSB are securely connected before applying medium voltage to the
drive.
Failure to connect both ground connections on the voltage sensing
board will result in high potential in the low voltage cabinet within the
drive that will damage the drive control, and possible cause injury or
death to personnel.
Output Grounding Network
b. Reconnect the ground connection on the OGN capacitor. The bolt
connection should torque down to 3.4 N•m (30 lb•in). Exceeding the
torque rating of this connection may result in damage to the capacitor.
Failure to reconnect the OGN ground may result in impressing the
neutral voltage offset on the motor cables and stator, which may result
in equipment damage. For drives that did not originally have the OGN
connected (or even installed), this is not a concern.
Transient Suppression Network
c. Re-install the fuses on the TSN.