ID-E270-011GB
43
Fig. 5.14 MZ-48 control panel power supply module
5.9 CONTROL PANEL OPERATION WITH BATTERY CLUSTER
The POLON 4900 control panel may be supplied by the battery cluster comprising of two 12 V leak-
proof lead-acid batteries. The battery cluster must be connected to the terminals marked as AK on
the MZ-48 module board. A terminal block marked as "PROBE" is also located on the same board and
it is used to connect a temperature probe.
The advantage of using this probe in the vicinity of the batteries is a possibility of automatic
adjustment of the buffering voltage depending on the temperature and according to the defined
temperature factor. It extends the life of batteries operated in different ambient temperatures.
While choosing a battery size, it is necessary to obey the rule that its capacity should ensure at least
30-hour (in the case of the servicing personnel availability within 24 h) or 72-hour control panel
operation in the quiescent mode, and after that a 30-minute alarm.
