Common Bus/Precharge Notes; Input Power Conditions - Allen-Bradley PowerFlex 40P Quick Start Manual

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Power Terminal Block Specifications
Frame
B
C
(1)

Input Power Conditions

Input Power Condition
Low Line Impedance (less than 1% line reactance) • Install Line Reactor
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)
(2)

Common Bus/Precharge Notes

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.
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Maximum Wire Size
2
5.3 mm (10 AWG)
2
8.4 mm (8 AWG)
Maximum/minimum sizes that the terminal block will accept - these are not
recommendations.
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.
Refer to Appendix B of the PowerFlex 40P User Manual for accessory ordering
information.
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(1)
Minimum Wire Size
2
1.3 mm (16 AWG)
2
1.3 mm (16 AWG)
Corrective Action
• or Isolation Transformer
• or Bus Inductor – 5.5 & 11 kW
• Install Line Reactor
• or Isolation Transformer
• Remove MOV jumper to ground.
• or Install Isolation Transformer
(1) • Install Line Reactor
Industry Automation
(1)
Torque
1.7-2.2 N-m (16-19 lb.-in.)
2.9-3.7 N-m (26-33 lb.-in.)
(2)
(7.5 & 15 HP) drives only
with grounded secondary if
necessary.
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