ABB ACS2000 AFE 1MVA, User Manual

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21 ACS2000 AFE 1MVA UM 3BHS297030 ZAB E01 REV. J
The main circuit breaker (MCB) is a major protec-
tion device of the drive. If a serious fault occurs in
the drive, the MCB must disconnect the main
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.
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References
—
0-1 Drive system overview
—
0-1
M
CT
MCB control interface
Higher-level
control system
Local MCB control
Main power supply
MCB
Protection
relay
Input
transformer
Drive
Motor