Replacing Emc Boards - ABB MNS-Up Service Manual

H A N D L I N G O F E M C B O A R D S 57
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Handling of EMC boards
In each of the MNS-Up sections, two EMC boards are installed on the distribution bars. The boards are located behind the
filter modules. To access the boards, all the filter modules must be removed.
A complete system shutdown is required if emc boards must be accessed.
Figure 10-01 EMC filter module on distribution bars in filter sections
10.1

Replacing EMC boards

Turn down the MNS-Up module as described in the DPA500 manual section 6.11.
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Open and padlock all filter module breakers
• Switch OFF and padlock incoming feeders and bypass feeder to completely isolate the MNS-Up system
• Open remote and padlock battery breakers to isolate the battery connections
• Check that all connections are voltage free
• Earthing of incoming feeder
• Earthing of remote battery breaker
• Remove all filter modules in the filter section
• Remove the EMC filter module from distribution bars
• Incoming EMC filter is connected to the upper distribution bars
• Outgoing EMC filter is connected to the lower distribution bars