104
Service
3ADW000488R0101 DCS880 Service manual e a
Exchange current transformers size H6
Before the work is started, disconnect the converter completely from the power supply,
then check the voltage free condition and make sure, everything is located in an electrical
and mechanical safe condition!
If current transformers fail or need to be repaired, the following has to be considered:
− It is important, that all current transformers are orientated and mounted in the same way on the busbars.
− Check the wiring of the old current transformers according the figure in chapter Wiring
. It is important, that
all current transformers are wired in the same way. Take additional care in case the connection is not
done by coded twisted pair cables.
Current transformer type
− The current transformers are located in the H6 module.
− AC busbars are routed through the current transformers. The current transformers are kept in place by
design and need no further mounting.
− The connection to the electronics is done via twisted pair cables with coded faston plugs on both ends.
Exchange
− Disconnect the AC wires/busbars at the
top of the drive.
− To get access to the current transformers
remove the top panel of the converter’s
body.
− Now the old current transformers can be
removed.
− Install the new current transformers with
proper orientation. No extra mechanical
mounting is necessary.
− Take care of proper electrical
connections.
− Remount the top panel.
− Reconnect the AC wires/bus bars.
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