Remote Control ON
CPU OK Flashing
Protocol RX Data and TX Data flashing occasionally when the SCADA system polls the RCU.
For some protocols such as DNP3 which may not have frequent polling of the RCU it may be
possible to force unsolicited messages to the SCADA system by turning the Remote Control
Switch OFF and ON again. The Protocol LEDs can be observed and voice communication with
the SCADA operator will confirm receipt of the data.
9.3 Spare Parts
Spare parts must only be replaced by qualified personnel.
Battery 12 V, 7.2 Ah Lead acid
9.4 Battery replacement
The RCU monitors the battery to determine when replacement is required as described on page 97.
If the battery is detected as being near end of its life the Replace Battery indicator on the front panel
is lit and the replace battery database point will be set.
When the battery is replaced it must be of the same type. The battery is a sealed lead-acid battery
preferably conforming to the battery standard JISC8702. Battery specification is in section 10.4 and
the Siemens part number is listed above for re-ordering.
To replace a battery the action is:
1 Turn off the battery switch, check that the battery LED lights on the display panel go out.
The mains or solar switches can be left on and the RCU will still be operating.
2 Remove the battery compartment cover (Phillips No 2 screwdriver required).
3 Disconnect the battery and remove. Dispose of battery according to local environmental
regulations.
4 Put in new battery and re-connect. Take care to connect with the correct polarity, red wire
to battery positive terminal. If the battery is connected in reverse the battery fuse in the
battery positive lead will blow. If this happens reverse the connections and replace the
fuse. Fuse type is Automotive MINI - 15 A.
5 Turn on the battery switch. Check the battery LED comes on. This may take several
seconds.
6 Press and released the door switch four times within a 10 second period. Take care to
ensure the LEDs go out before releasing the door switch. The replace battery LED will
go out and the battery life has been reset.
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