Motor Overload Protection; Short Circuit Current Rating; Input Contactor Precautions; Output Contactor Precaution - Allen-Bradley PowerFlex 755T Installation Instructions Manual
Powerflex 750-series products with totalforce control
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- User manual (193 pages) ,
- Product information, original instructions (48 pages) ,
- Installation instructions manual (24 pages)
Table of Contents
Chapter 5
Power Wiring
Motor Overload Protection
Short Circuit Current Rating
Input Contactor Precautions
Output Contactor Precaution
126
Electronic Motor Overload Protection
Maximum Short Circuit Rating
Actual Short Circuit Rating
ATTENTION: A contactor or other device that routinely disconnects and
reapplies the AC line to the drive to start and stop the motor can cause drive
hardware damage. The drive is designed to use control input signals that will
start and stop the motor. If an input device is used, operation must not
exceed one cycle every three minutes or drive damage will occur.
ATTENTION: The drive start/stop/enable control circuitry includes solid state
components. If hazards due to accidental contact with moving machinery or
unintentional flow of liquid, gas or solids exist, an additional hardwired stop
circuit may be required to remove the AC line to the drive. An auxiliary
braking method may be required.
ATTENTION: To guard against drive damage when using output contactors,
the following information must be read and understood. One or more output
contactors may be installed between the drive and motor(s) for the purpose
of disconnecting or isolating certain motors/loads. If a contactor is opened
while the drive is operating, power will be removed from the respective
motor, but the drive will continue to produce voltage at the output
terminals. In addition, reconnecting a motor to an active drive (by closing
the contactor) could produce excessive current that may cause the drive to
fault. If any of these conditions are determined to be undesirable or unsafe,
an auxiliary contact on the output contactor should be wired to a drive
digital input that is programmed as "Enable." This will cause the drive to
execute a coast-to-stop (cease output) whenever an output contactor is
opened.
Rockwell Automation Publication 750-IN100B-EN-P - July 2017
Class 10 motor overload protection according to NEC article 430 and motor
over-temperature protection according to NEC article 430.126 (A)(2).
UL61800-5-1 File E59272.
Suitable for use on a circuit capable of delivering not more than 100 kA rms
symmetrical amperes, up to 600V maximum and 65 kA rms symmetrical
amperes at 690V maximum.
Can be further limited by AIC rating of customer supplied branch circuit fuse/
circuit breaker. The lowest rated device in the circuit determines the branch
short circuit rating. If the fuses providing powers to the drive are lower than
100 kA rms, the branch short circuit protection is the short circuit rating of the
fuses. If the fuses have rating higher than 100 kA rms, the branch circuit
protection is 100 kA rms.
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