Important Note - Main Circuit Breaker - ABB ACS5000 User Manual

2.7

Important note - main circuit breaker

The main circuit breaker (MCB) is a major protection 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
prevent hazard to the personnel and further damage to the equipment.
The MCB is located on the primary side of the converter transformer.
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(1) Main power supply
(2) MCB control interface
(3) Higher-level control system
(4) Local MCB control
(5) MCB
The MCB is defined as a switching device to disconnect 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
A dedicated protection relay is used for:
• Transformer primary cable protection
• Transformer protection (if applicable)
• Transformer secondary cable protection (if applicable)
• Backing up the drive protection
In general, these protective measures are not included in the drive as
provided by ABB.
3BHS799208 E01 REV E
5 6
Figure 2-2 Drive system overview
ACS5000 WATER-COOLED USER MANUAL
02 IMPORTANT SAFETY INFORMATION
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(6) Protection relay
(7) Converter transformer
(8) Drive
(9) Motor
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