Rockwell Automation Publication 520-TD002A-EN-E - May 2015 21
PowerFlex 527 AC Drive Specifications
RFI Filter Grounding
Using a drive with filter may 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 should not include any form of plug or
socket that would permit inadvertent disconnection. Some local codes may require redundant ground connections. The
integrity of all connections should be periodically checked.
Power Wiring
Motor Cable Types Acceptable for 100...600 Volt Installations
A variety of cable types are acceptable for drive installations. For many installations, unshielded cable is adequate, provided
it can be separated from sensitive circuits. As an approximate guide, allow a spacing of 0.3 m (1 ft) for every 10 m (32.8 ft)
of length. In all cases, long parallel runs must be avoided. Do not use cable with an insulation thickness less than 15 mils
(0.4 mm/0.015 in.). Do not route more than three sets of motor leads in a single conduit to minimize “cross talk”. If more
than three drive/motor connections per conduit are required, shielded cable must be used.
UL installations above 50 °C ambient must use 600V, 90 °C wire.
UL installations in 50 °C ambient must use 600V, 75 °C or 90 °C wire.
UL installations in 40 °C ambient should use 600V, 75 °C or 90 °C wire.
Use copper wire only. Wire gauge requirements and recommendations are based on 75 °C. Do not reduce wire gauge when
using higher temperature wire.
Unshielded
THHN, THWN or similar wire is acceptable for drive installation in dry environments provided adequate free air space
and/or conduit fill rates limits are provided. Any wire chosen must have a minimum insulation thickness of 15 mils and
should not have large variations in insulation concentricity.
ATTENTION: National Codes and standards (NEC, VDE, BSI, etc.) and local codes outline provisions for safely installing electrical
equipment. Installation must comply with specifications regarding wire types, conductor sizes, branch circuit protection and
disconnect devices. Failure to do so may result in personal injury and/or equipment damage.
ATTENTION: To avoid a possible shock hazard caused by induced voltages, unused wires in the conduit must be grounded at both
ends. For the same reason, if a drive sharing a conduit is being serviced or installed, all drives using this conduit should be disabled.
This will help minimize the possible shock hazard from “cross coupled” power leads.
ATTENTION: The distance between the drive and motor must not exceed the maximum cable length stated in the Motor Cable
Length Restrictions Tables in “Wiring and Grounding Guide, (PWM) AC Drives,” publication DRIVES-IN001
.
ATTENTION: Do not use THHN or similarly coated wire in wet areas.
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