3BHS212794 E01 REV M ACS6000 USER MANUAL 47/278
02 IMPORTANT SAFETY INFORMATION
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.
Figure 2-2 Drive system overview
Note: MCBs and protection relays are not included in the drive supply.
Typical MCBs devices
• Vacuum circuit breakers
• SF6 circuit breakers
• Fused contactors or motor control centers
Dedicated protection relay
• Transformer or drive primary cable protection (DTL)
• Transformer protection (if applicable)
• Transformer secondary cable protection (if applicable)
• Backing up the drive protection
(1) Main power supply
(2) MCB control interface
(3) Higher-level control system
(4) Local MCB control
(5) MCB
(6) Protection relay
(7) Converter transformer
(8) Drive
(9) Motor
1
3
4
5 6 7
8
9
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