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Rockwell Automation Publication 20B-IN019E-EN-P - July 2013
PowerFlex 700 Adjustable Frequency AC Drive – Frames 0…6
Shield Termination
Shield termination at “SHLD” provides a grounding point for the motor cable
shield. The
motor cable
shield must be connected to this terminal on the drive
(drive end) and the motor frame (motor end). A shield terminating cable gland
can also be used.
When shielded cable is used for
control and signal wiring
, the shield must be
grounded at the source end only, not at the drive end.
RFI Filter Grounding
Using an optional RFI filter can result in relatively high ground leakage currents.
Therefore, the
filter must only be used in installations with grounded AC
supply systems and be permanently installed and solidly grounded
(bonded)
to the building power distribution ground. Ensure that the incoming supply
neutral is solidly connected (bonded) to the same building power distribution
ground. Grounding must not rely on flexible cables and must not include any
form of plug or socket that permits inadvertent disconnection. Some local codes
can require redundant ground connections. Periodically check the integrity of all
connections. Refer to the instructions supplied with the filter.
Motor Overload Protection
Drives with Standard Control
PowerFlex 700 drives with standard control, identified by an N, A, or B in
position 15 of the catalog number, only provide Class 10 motor overload
protection according to NEC article 430. They do not provide speed sensitive
overload protection, thermal memory retention and motor over-temperature
sensing according to NEC article 430.126 (A) (2). If such protection is needed in
the end-use product, it must be provided by additional means.
Drives with Vector Control
PowerFlex 700 drives with vector control, identified by a C or D in position 15 of
the catalog number, provide class 10 motor overload protection according to
NEC article 430 and motor over-temperature protection according to NEC
article 430.126 (A) (2). UL 508C File E59272.
