24 Rockwell Automation Publication 750-UM006C-EN-P - March 2022
Chapter 2 Prepare for Installation
Figure 2 - Feeder Circuit Protection
1. From user-supplied 400/480V AC, 3-phase, 50/60 Hz delta-Wye connected power distribution with solidly grounded neutral.
2. If the user-supplied input power distribution exceeds 20 times drive rating kVA, additional impedance must be supplied in the form
of an input line reactor or isolation transformer.
Short-circuit current rating (SCCR)
The short-circuit rating for the drive is 65,000A RMS at 400/480V AC. The
suitable circuit breaker for this circuit must be capable of delivering not more
than 65,000 RMS symmetrical amperes at 480V AC, 100 A maximum, when
protected by a Bulletin 140G-H frame molded case circuit breaker. Also, the
suitable fuses for this circuit must be capable of delivering not more than
65,000 RMS symmetrical amperes at 480V AC maximum when protected by
CC, J, and T class.
Circuit Breakers
The drive has three circuit breakers that are accessible on the front cover. All
three circuit breakers must be made with power present for the drive to operate
and control the motor and brake properly. The 400/480V AC main input
rotary circuit breaker provides power through the M35 power receptacle
(L123). See Feeder Circuit Protection
on page 24 for more information.
U (T1)
V (T2)
W (T3)
SHLD
Exposed Structure
and/or Building Steel
Shielded Motor
Cable
M35
R (L1)
S (L2)
T (L3)
Maximum
65,000 A SCCR
Exposed Structure and/or
Building Steel
WARNING: Circumstances that can cause an explosion may exist, which may
lead to personal injury or death, property damage, or economic loss. Do not
install the drive where the maximum available fault current exceeds the
65,000 A RMS symmetrical amperes.
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