Installation, Operation and Technical Manual Rectifier Technologies
158-1872-01 17 19-Feb-14
annunciation of alarms: Relay 3 - HVSD, Relay 4 – any system alarm, Relay 5 - SMR shut
down.
Other two relays are used for control of optional external equipment.
Relay 2 is programmed for FAN CONTROL. If any one of the SMR heat-sink temperatures
exceeds a pre-set (non-programmable) value, the relay closes. The relay closure can then
be used to either speed up fans, which may normally be idling at low speed, or it can turn
on fans, which may normally be off.
In 110V systems Relay 1 closes during battery discharge test, allowing control of dummy
load on standby systems. In 24V and 48V systems it has no assigned function.
If MCSU-4 supports User Programmable Relays, the functions described above can be
changed on site according to specification of the installation (for details see paragraph
“User programmable relay functions” in chapter “Operation”). It is also possible to
permanently assign different functions to the relays on end user request by modifying
controller software.
4.4.3.2 Connections to MCSU
Two ribbon cables connect between MUIB2 and MCSU-4 magazine. One 34-way ribbon
cable for the main port connects X1 on MUIB2 to MCSU-4. The other 16-way ribbon cable
connects X180 or X179 on MUIB2 to the aux port of MCSU-4.
Note: The connection of the 16-way ribbon to X179 or X180 must be made if any of X76,
X89, X103, X115, or X129 are used.
4.4.3.3 Battery Current Transducer Input
Battery current transducers are connected to X39 and X40 of the MUIB. Figure 4.2 shows
the pin connections for the battery transducer connector going onto the MUIB.
Figure 4.10 Battery transducers connection to MUIB2
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