Installation, Operation and Technical Manual Rectifier Technologies
158-1872-01 82 19-Feb-14
It therefore follows that it is possible for a MCSU-4 fault to occur which can suppress the
SMR voltage to that low level and thus cause a battery discharge despite the precautions
that have been taken to ensure that this does not happen.
In such a situation disconnecting the 4-way cable, which connects the SMRs to the
MCSU-4, will remove the voltage suppressing communications control signal and
thus avoid the batteries discharging. Alternatively, the MCSU-4 can be pulled out of
the magazine to achieve the same result. Without the MCSU-4 connected, the SMRs
will revert to their pre-set Float voltage and passive current sharing.
There are virtually no electronic components on the MUIB except for the Remote alarm
relays, and some fuse links, but there are many connectors. It is worth checking for poor
connections when a MCSU-4 system problem is being investigated.
9.2.1 Replacing MCSU-4
The MCSU-4 is “hot-swappable”, so replacing a faulty unit is simply a matter of pulling the
bad unit out of the MCSU-4 magazine and plugging a new unit in. The new unit will then
power up and automatically read the system parameters stored in the non-volatile memory
located on the backplane. The system parameters should then be checked via the front
panel menus or using WinCSU-2.
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