Table of Contents
Advertisement
D-6
Meggering
7000A-UM151E-EN-P - October 2018
6. Reconnect the Power Circuit to the System Ground
Voltage Sensing Boards
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 the ground conductor was not connected, the
monitored low voltage signal could then rise up to medium
voltage potential which is a serious hazard that must be
avoided at all times. You must 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
A T T E N T I O N
A T T E N T I O N
the voltage sensing board will result in high
potential in the Low Voltage cabinet within the
drive which will result in damage to the drive
control and possible injury or death to
personnel.
Output Grounding Network
Reconnect the ground connection on the OGN capacitor. The
bolt connection should be torque down to 3.4 Nm (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
A T T E N T I O N
A T T E N T I O N
in the neutral voltage offset being impressed 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.
7000 "A" Frame
Advertisement
Table of Contents
