Battery Charger Check Procedure - Fire-Lite Alarms MS-4012 Instruction Manual

Charger Test, New Models (CMS-4012/4024s and newer model MS-4012/4024s only)
IMPORTANT! The Battery Charger Output cannot be field adjusted on CMS-
4012/4024 control panels and on newer revisions of the MS-4012/4024 control
panels. These panels are distinquished from earlier models by the addition of two
non-resettable power terminals (Terminal Block 3) in the upper right-hand part
of the control board. Any attempts to adjust this output may result in damage to
the batteries (to read and adjust the charger output on earlier model MS-4012/
4024s, see the next page).
The charger output can be read with a voltmeter to determine if the panel is
operating properly. To read the charger output, see Figure 3M: Battery Charger
Check Procedure. If the charger output voltage does not meet specifications (and
the transformer is known to be good), the control panel will have to be repaired
or replaced.
Step 1
Remove and save JP12 from the
control panel.
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Step 2
Remove the batteries and place a 1k,
watt resistor across the charger ouput
pins - P2, pin 1(+) and P2, pin 3 (-).
Step 3
Using a voltmeter, measure the DC voltage across the 1K resistor. This
voltage must be 13.2 - 13.3 on the 4012, or 27.5 - 27.7 on the 4024.
At the conclusion of the test, remove the voltmeter and 1K resistor,
replace the batteries, and reinstall JP12!
Figure 3M: Battery Charger Check Procedure
15586 Rev E
firealarmresources.com
1-
5/14/93 P/N 15586:E
Newer 4012s and 4024s
contain TB3 (Non-
resettable Power Output).