Maintenance 109
Location of door safety switch
The safety switch is tied into the door interlocking circuit of the drive and the interlocks
from the main circuit breaker of the drive. The interlocking system ensures that:
• the main power can only be connected to the drive if the door is securely closed and
the safety switch is in the locked position.
• the door can only be opened if the main circuit breaker is open and the DC link is
discharged.
Also, the door of the INU compartment can not be opened
• if the drive is disconnected from the auxiliary power
• if the safety switch of the door is in the locked position.
If the auxiliary voltage is switched off and the door is locked but cannot be opened, check
the position of the release dial of the safety switch. If the release dial is in the locked
position, unlock the safety switch as described in Safety-switch settings on page 109. ABB
can also provide thicker air cassette as optional for high level protection.
Safety-switch settings
There’re two kinds of safety switches as follows,
Safety-switch setting 1
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