Rockwell Automation 22D PowerFlex 40P Quick Start - FRN 1.xx - 3.xx - Manual (Page 10)

English-8
Input Power Conditions
If drives with internal precharge are used with a disconnect switch to the
common bus, then an auxiliary contact on the disconnect must be
connected to a digital input of the drive. The corresponding input
(parameter A051-A054) must be set to option 29, “Precharge Enable.”
This provides the proper precharge interlock, guarding against possible
damage to the drive when connected to a common DC bus.
Input Power Condition Corrective Action
Low Line Impedance (less than 1% line reactance) • Install Line Reactor (2)
• or Isolation Transformer
• or Bus Inductor – 5.5 & 11 kW
(7.5 & 15 HP) drives only
(2)
Refer to Appendix B of the PowerFlex 40P User Manual for accessory ordering
information.
Greater than 120 kVA supply transformer
Line has power factor correction capacitors • Install Line Reactor
• 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.
• or Install Isolation Transformer
with grounded secondary if
necessary.
Ungrounded distribution system
240V open delta configuration (stinger leg)
(1)
(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. Refer to the
PowerFlex 40P User Manual for specific line reactor part numbers.
• Install Line Reactor
Common Bus/Precharge Notes