Motor overload protection, Drive, fuse, and circuit breaker ratings, 25 drive, fuse, and circuit breaker ratings – Rockwell Automation 20A PowerFlex 70 Adjustable Frequency AC Drive User Manual
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Rockwell Automation Publication 20A-IN009D-EN-P - June 2013
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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,
publicatio
ails.
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
The tables on the following pages provide recommended AC line input fuse and
circuit breaker information. See Fusing and Circuit Breakers below for UL and
IEC requirements. Sizes listed are the recommended sizes based on 40 °C
(104 °F) and the U.S. NEC. Other country, state, or local codes can require
different ratings.
Fusing
The recommend fuse types are listed below. If available current ratings do not
match those listed in the tables 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 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.