Main Circuit Breaker Protection Device; Fig. 3. Drive System Overview - ABB ACS5000 User Manual

2.4. Main circuit breaker protection device

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
Key:
(1) Main power supply
(2) MCB control interface
(3) Higher-level control system
(4) Local MCB control
(5) MCB

Fig. 3. Drive system overview

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 gen. 2
2
6
DOCUMENT KIND
User manual
IMPORTANT SAFETY INFORMATION
7
(6) Protection relay
(7) Converter transformer
(8) Drive
(9) Motor
DOCUMENT ID.
3BHS799208 E01
3
4
9
8
REV. LANG. PAGE
J en 28/186