General Grounding Requirements - Allen-Bradley PowerFlex 525 User Manual

Chapter 1 Installation/Wiring
General Grounding
Requirements
16
Input Power Conditioning
The drive is suitable for direct connection to input power within the rated
voltage of the drive (see
table below are certain input power conditions which may cause component
damage or reduction in product life. If any of these conditions exist, install one of
the devices listed under the heading Corrective Action on the line side of the
drive.
Only one device per branch circuit is required. It should be mounted closest to
IMPORTANT
the branch and sized to handle the total current of the branch circuit.
Input Power Conditions
Input Power Condition
Low Line Impedance (less than 1% line reactance)
Greater than 120 kVA supply transformer
Line has power factor correction capacitors
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
Ungrounded distribution system
240V open delta configuration (stinger leg)
(1) For drives applied on an open delta with a middle phase grounded neutral system, the phase opposite the phase that is tapped in
the middle to the neutral or earth is referred to as the "stinger leg," "high leg," "red leg," etc. This leg should be identified throughout
the system with red or orange tape on the wire at each connection point. The stinger leg should be connected to the center Phase B
on the reactor. See Bulletin 1321-3R Series Line Reactors on page 156
(2) See Appendix B for accessory ordering information.
The drive Safety 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.
Typical Grounding
R/L1
S/L2
T/L3
Rockwell Automation Publication 520-UM001A-EN-E - February 2013
Appendix A). Listed in the
(1)
for specific line reactor part numbers.
(PE) must be connected to system ground. Ground
Esc Sel
SHLD
Input Power Conditions
Corrective Action
(2)
• Install Line Reactor
• or Isolation Transformer
(2)
• Install Line Reactor
• or Isolation Transformer
• Remove MOV jumper to ground.
• or Install Isolation Transformer with
grounded secondary if necessary.
(2)
• Install Line Reactor
U/T1
V/T2
W/T3