Important Note - Main Circuit Breaker; Figure 2-2 Drive System Overview - 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.
1
5

Figure 2-2 Drive system overview

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.
PRODUCT
ACS5000W
2
6 7
DOCUMENT KIND
User manual
IMPORTANT SAFETY INFORMATION
3
4
8
6) Protection relay
7) Converter transformer
8) Drive
9) Motor
DOCUMENT ID.
3BHS799208 E01
9
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