Grounding Practices - Allen-Bradley PowerFlex 7000 User Manual

2-34 Drive Installation

Grounding Practices

7000A-UM151E-EN-P - October 2018
The purpose of grounding is to:
• provide for the safety of personnel
• limit dangerous voltages on exposed parts with respect to ground
• facilitate proper over current device operation under ground fault
conditions, and
• provide for electrical interference suppression
I M P O R T A N T I M P O R T A N T
Refer to the grounding diagrams that follow for ground connections.
The drive's main ground bus must be connected to the system
ground. This ground bus is the common ground point for all grounds
internal to the drive.
ISOLATION
TRANSFORMER
Figure 2.23 – Ground Connection Diagram with Isolation Transformer
AC LINE AC LINE
REACTOR REACTOR
TRANSFORMER TRANSFORMER
Figure 2.24 – Ground Connection Diagram with Line Reactor
Generally, the means used for external grounding
of equipment should be in accordance with the
Canadian Electrical Code (CEC), C22.1 or the
National Electrical Code (NEC), NFPA 70 and
applicable local codes.
2U
OUTPUT
2V
GROUND
NETWORK
2W
GROUND BUS
2U 2U
GROUND GROUND
2V 2V
FILTER FILTER
2W 2W
GROUND BUS GROUND BUS
Connected to the neutral point
of the output capacitor
AC
U (T1)
MOTOR
V (T2)
W (T3)
Connected to the neutral point Connected to the neutral point
of the output capacitor of the output capacitor
AC AC
U (T1) U (T1)
MOTOR MOTOR
V (T2) V (T2)
W (T3) W (T3)
7000 "A" Frame