Connecting The Standby Batteries; Fig.11 - Battery Connection Details - C-TEC CAST ZFP Installation, Maintenance & Operating Manual

CAST ZFP Analogue Addressable Fire Alarm Panel

5.17 Connecting the Standby Batteries

CAUTION: There is a risk of explosion if an incorrect battery type is used. Always dispose of
used batteries in accordance with the battery manufacturers' instructions.
Do not make the final battery connections until the installation wiring is complete and the
panel is ready to be tested. One method of isolating battery power is to disconnect the battery
link wire.
Two new, good quality and fully charged 12V valve regulated lead acid (VRLA) batteries are required as the
emergency standby power supply for the panel.
The batteries should be connected in series and located in the bottom of the panel's enclosure, as shown in Fig.11
below. Connect the 'Red' (+ve) and 'Black' (-ve) battery wires from the battery terminals to connector block
CONN7 on the power supply's PCB. The (red and black) battery wires, (green) link wire and nylon cable ties are
supplied in the panel's accessory pack. Secure the batteries into position using the cable ties.
The panel's sophisticated battery monitoring unit protects the batteries against deep discharge by activating a
cut off circuit when the standby supply voltage reaches 21V approx. If batteries are not fitted, are discharged
or in poor condition, a PSU fault will show at the panel.
The capacity of the batteries used will depend upon the required standby time. To calculate the batteries
required for any given standby period, see the battery calculation guide in Appendix 5.
Fig.11 – Battery Connection Details
Installation and Programming Manual  Approved Document No. DFU5030000 Rev 4  Page 20 of 60
CAUTION! Inferior and New Batteries stored over 6 months.
The panel's PSU is an EN 54-4/A2 power supply and as such measures
accurately the internal battery resistance down to a fraction of an ohm.
The fault threshold is a function of EN 54-4 and as such cannot be
changed, otherwise, it would NOT be a certifiable power supply.
Batteries stored for long periods of time before use (especially new
ones!), suffer a progressive degradation of internal resistance the
longer they are kept off charge after manufacture. Contrary to popular
opinion they DO NOT recover this degradation once re-charged. In
order for the battery to recover it MUST be discharged and charged
several times (more than once), each time you will see a reduction in
the internal resistance.
Therefore, if you install one of these batteries AND it shows a fault
AND you just leave it AND expect the fault to go away, it will not! In
this instance it is not the charger at fault, it is the battery.