Drive System Overview - ABB ACS2000 AFE 1MVA User Manual

21 ACS2000 AFE 1MVA UM 3BHS297030 ZAB E01 REV. J
The main circuit breaker (MCB) is a major protec-
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References
tion device of the drive. If a serious fault occurs in
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the drive, the MCB must disconnect the main

0-1 Drive system overview

power supply to the drive immediately. The main
power supply must be disconnected without delay
on an open or trip command from the drive to pre-
vent hazard to the personnel and further damage
to the equipment. The MCB is located on the pri-
mary side of the input transformer.
0-1 shows the conceptual single-line diagram of a
typical drive system, including main power supply,
MCB, input transformer, drive and electrical motor.
The MCB is defined as a switching device to dis-
connect the power supply whenever required by
the process or when a fault occurs. Typical devices
used as MCBs are:
• Vacuum circuit breakers
• SF6 circuit breakers
• Fused contactors or motor control centers
The overcurrent protection relay is part of the
switchgear.
Main power supply
MCB
Protection
relay
Input
transformer
Drive
Motor
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0-1
CT
M
MCB control interface
Higher-level
control system
Local MCB control