3、After checking the ship's emergency cut-off system diagram ,you can find that emergency stop input signals were sent to MSBD,and some loads tripped. And then the ESBD received the same emergency stop sigals SHT1/2/3 form MSBD 's extended contact.
If we use AC220V main switchboard power , when main switchboard loss power ,the relays in MSBD don't do any action when the MSBD received the emergency stop signals outside, and ESBD can not get the same signals too. It is dangerous
So we can not use AC220V as emergency cut off signal input power in MSBD.
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