Rockwell Automation Publication 22C-UM001J-EN-E - January 2017 19
Installation/Wiring Chapter 1
Note: Frame D, G and H drives do not contain a MOV to ground connection
and are suitable for operation in both grounded and ungrounded distribution
systems without modification.
Input Power Conditioning
The drive is suitable for direct connection to input power within the rated
voltage of the drive (see Appendix A
). Listed in Tab l e 1 are certain input power
conditions which may cause component damage or reduction in product life. If
any of the conditions exist, as described in Ta b le 1
, install one of the devices
listed under the heading Corrective Action on the line side of the drive.
General Grounding
Requirements
The drive Safety Ground - (PE) must be connected to system ground.
Ground impedance must conform to the requirements of national and local
industrial safety regulations and/or electrical codes. The integrity of all ground
connections should be periodically checked.
Figure 7 - Typical Grounding
IMPORTANT Only one device per branch circuit is required. The device should be mounted
closest to the branch and sized to handle the total current of the branch
circuit.
Table 1 - Input Power Conditions
Input Power Condition Corrective Action
Low Line Impedance (less than 1% line reactance) • Install Line Reactor
(1)
• or Isolation Transformer
(1) Refer to Appendix B for accessory ordering information.
Line has power factor correction capacitors • Install Line Reactor
(1)
• or Isolation Transformer
Line has frequent power interruptions
Line has intermittent noise spikes in excess of 6000V
(lightning)
Phase to ground voltage exceeds 125% of normal line to
line voltage
• Remove MOV jumper to ground (Frame C, E and F
drives only)
• or Install Isolation Transformer with grounded
secondary if necessary
Ungrounded distribution system
SHLD
U/T1
V/T2
W/T3
R/L1
S/L2
T/L3
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