Rockwell Automation Publication 20A-IN009E-EN-P - January 2015 25
PowerFlex 70 Adjustable Frequency AC Drive
Motor Cable Lengths
Typically, motor lead lengths less than 30 m (approximately 100 ft) are
acceptable. However, if your application requires longer lengths, refer to Wiring
and Grounding Guidelines for Pulse Width Modulated (PWM) AC Drives,
publication DRIVES-IN001
, for details.
Electronic Motor Overload Protection
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.
Drive, Fuse, and Circuit Breaker Ratings
Integral solid-state short circuit protection does not provide branch circuit
protection. Branch circuit protection must be provided in accordance with the
National Electric Code (NEC) and any additional local codes, or the equivalent.
The tables on the following pages provide drive ratings (including continuous, 1
minute and 3 second) and recommended AC line input fuse and circuit breaker
information. Both types of short circuit protection are acceptable for UL and
IEC requirements. Sizes that are listed are the recommended sizes that are based
on 40 °C (104 °F) and the U.S. N.E.C. Other country, state, or local codes may
require different ratings.
Fusing
The recommend fuse types are listed below. If available current ratings do not
match those listed in the tables that are provided, choose the next higher fuse
rating.
• IEC – BS88 (British Standard) Parts 1 & 2, EN60269-1, Parts 1 & 2
(1)
,
type gG or equivalent should be used.
• UL – UL Class CC, T, RK1, or J should be used.
Circuit Breakers
The “non-fuse” listings in the following tables include inverse time circuit
breakers, instantaneous trip circuit breakers (motor circuit protectors) and 140M
self-protected combination motor controllers. If one of these devices is chosen as
the desired protection method, the following requirements apply:
• IEC – Both types of circuit breakers and 140M self-protected
combination motor controllers are acceptable for IEC installations.
• UL – Only inverse time circuit breakers and the specified 140M
self-protected combination motor controllers are acceptable for
UL installations.
(1) Typical designations include, but may not be limited to the following; Parts 1 & 2: AC, AD, BC, BD, CD, DD, ED, EFS, EF, FF, FG, GF, GG,
GH.
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