76 Rockwell Automation Publication 750-IN119A-EN-P - April 2022
Chapter 5 Power Wiring
Intermittent Overload
Motor Overload Protection
Short-circuit Current Rating
Apply and Remove Power
Input Contactor
Precautions
Normal Duty
110% Overload capability for up to 1 minute out of 10 minutes
150% Overload capability for up to 3 seconds out of 60 seconds
Heavy Duty
150% Overload capability for up to 1 minute out of 10 minutes
180% Overload capability for up to 3 seconds out of 60 seconds
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).
UL61800-5-1 File E59272.
Maximum Short Circuit Rating The maximum short circuit rating is 100,000 A RMS symmetrical.
Actual Short Circuit Rating
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 power to the drive are
lower than 100 kA rms, the maximum short circuit rating is the short circuit
rating of the fuses. If the fuses have rating higher than 100 kA rms, the
maximum short circuit rating is 100 kA rms.
IMPORTANT It’s recommend that you wait 5 minutes before cycling the power
disconnect switches. This recommendation applies to both Off-to-On
and On-to-Off transitions. Rapid power cycling can result in equipment
damage.
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 5 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 can be required to remove the AC line to the drive. An auxiliary braking
method can be required.
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