Rockwell Automation Allen-Bradley PowerFlex 700AFE, User Manual

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58 Rockwell Automation Publication 20Y-UM001F-EN-P - April 2017
Chapter 2 AFE in IP21 Rittal Enclosure – Installation/Wiring
AC Supply Source
Considerations
The AFE Frame 10 or Frame 13 in an IP21 Rittal enclosure is suitable for use
on a circuit capable of delivering up to a maximum of 100,000 rms symmetrical
amperes, 600/690 volts, with recommended fuses or circuit breakers.
The AFE must not be used on undersized or high-impedance supply systems.
The supply system kVA must be equal to or greater than the drive-related kW,
and the system impedance must be less than 10%. Operation outside these
limits can cause instability that results in AFE shutdown.
System Impedance = (PowerFlex 700AFE kVA ÷ Transformer kVA) x Transformer % Impedance
You must consider the kVA of all PowerFlex AFEs on the distribution system
and the system impedance of upstream transformers.
If a residual current detector (RCD) is used as a system ground fault monitor,
use only Type B (adjustable) devices to avoid nuisance tripping.
Unbalanced, Ungrounded, or Resistive Grounded Distribution
Systems
If phase-to-ground voltage exceeds 125% of normal or the supply system is
ungrounded, see Wiring and Grounding Guidelines for Pulse Width
Modulated (PWM) AC Drives, publication DRIVES-IN001 , for more
information.
ATTENTION: To guard against personal injury and equipment damage that is
caused by improper fusing or circuit breaker selection, use only the
recommended line fuses or circuit breakers that are specified in
Appendix A .
ATTENTION: The PowerFlex Active Front End is not designed to be used on IT
(insulated tera) or corner-grounded power networks above 600V (phase-to-
phase voltage). Operation on such a network can cause a hazardous failure of
the insulation system of the AFE.
ATTENTION: The LCL filter of the PowerFlex Active Front End contains
common mode capacitors that are referenced to ground. These devices must
be disconnected if the AFE is installed on a resistive grounded distribution
system or an ungrounded distribution system. See Figure 37 on page 70 or
Figure 38 on page 70 for jumper locations.
ATTENTION: The power structure of the PowerFlex Active Front End in the
IP21 Rittal enclosure contains common mode capacitors that must be
disconnected , regardless of the application in which the AFE is used. For
locations of the common mode capacitors and instructions to remove them,
see
Frame 10 Power Structure on page 72 or Frame 13 Power Structure on
page 73 .