1397-5.29, September, 1998
Allen-Bradley
1397
400-600HP Inverting Fault Circuit
Breaker Kit
Cat. Nos. 1397-IFB600
What These Instructions
Contain
These instructions and any accompanying instructions contain the
necessary information to install a 1397 Inverting Fault Circuit Breaker
Kit on 1397 DC Drives rated 400 to 600HP @ 460 VAC only.
What This Option Provides
This option is intended to be applied to regenerative 1397 drives with
high inertia loads. High inertia loads are those where the reflected load
inertia to the motor is equal to or greater than the motor’s own inertia,
or where the drive is frequently regenerating power to the AC line, such
as in unwind and pay-off applications.
An inverting fault typically occurs as a result of loss of AC line. If this
happens, the AC input transformer becomes a short circuit across the
motor. Since the SCRs in the bridge no longer turn off, the motor’s
stored mechanical energy is regenerated into the short circuit. The
inverting Fault Circuit Breaker interrupts the generator action,
protecting the SCR bridge and the motor.
The Inverting Fault Circuit Breaker is a magnetic-only breaker with an
adjustable instananeous magnetic trip unit. The trip settings are
adjusted by a sliding control on the front of the breaker. The standard
interrupt rating is 30,000 amperes symmetrical at 480 VAC.
What This Kit Contains
Each 1397-Inverting Fault Circuit
Breaker kit includes:
• (1)Inverting Fault Circuit Breaker Assembly
• (6) M6
×
12mm Self-Tapping Screw
• (1) Wire Assembly
• (1) 1/4" Spade Terminal, Male
• (1) 7/16" Split Lockwashers
• (1) 1/2" Ring Lug, 22-16 ga.
• (1) Twisted Pair Wire Assembly
• (2) Shield, Top and Bottom
