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Document No: LT0499 RDU Mk2 Installation & Programming Manual
Configuring An RDU
Issue 1.02 8 April 2015 Page 5-3
5.3 BATTERY & POWER SUPPLY
5.3.1 GENERAL
The MAF RDU has a DC power supply, which also serves as a battery charger and requires
a 24V sealed lead acid battery (i.e., 2 x 12V batteries in series) to be fitted. Battery leads
with 4.8mm Quick Connect receptacles (for connecting to the battery tabs) are included.
The figures and calculations given in this section are for Australian operation. The same
calculations can be done for New Zealand operation but noting that the charger must fully
recharge the batteries within 24 hours under non-alarm conditions.
The non-MAF RDU is DC line powered from the FIP. Section 5.3.3 contains a sample
calculation detailing the extra loading on the FIP dc power supply and battery due to
connection of one or more RDUs.
Charger Rating
The standard MAF configured RDU has a 3A power supply. A 6A upgrade is available but is
not currently approved. This requires a second mains transformer, a 3A rectifier PCB and a
larger heatsink to be fitted. When a 6A power supply is fitted, additional battery protection is
also required (see Section 5.3.6).
To comply with AS1670.1 the power supply rating must be sufficient to charge the batteries
while powering the panel with 2 zones in alarm including any connected ancillary loads plus
all remaining quiescent loads. (This is not required in NZ).
The definition of charging the batteries is supplying enough current to charge them within 24
hours to provide a capacity that will support 5 hours of RDU quiescent load, i.e., non-alarm
with mains off followed by 0.5 hour of alarm load.
The recommended order of performing calculations is listed in Sec 5.3.2.
Battery Rating
(Refer to AS1670.1).
The battery capacity must be sufficient to support 24 hours of quiescent load (i.e., non-alarm
with mains off), followed by 0.5 hour of alarm for two worst case zones.
Notes
1.
The quiescent load includes the RDU electronics (in normal state) plus any external
normally energised loads that operate from the battery backed supply. Hence
door
holders are normally supplied from a non-battery backed supply.
2.
Alarm load includes RDU electronics (in alarm state) plus any external loads such as
bells, air conditioning shutdown relays, etc., plus the two fire suppression zones.