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4-3.2
Replacing the Lead-Acid System Batteries
The ADFM's internal batteries are two sealed lead-acid type batteries, with
a nominal capacity of 7 Ah each (see
voltage is 24V for both batteries connected in series, while the low voltage
is 20V. These batteries can be re-charged (see below). They are also com-
monly available. MGD recommends purchasing spare batteries. That way,
when the time comes to change the internal batteries, fully charged batteries
can be quickly installed and the drained batteries can be taken to be re-
charged.
CAUTION. If the Electronics Unit is connected to a mains power, for your
own personal safety we recommend that you disconnect mains first before
opening the Electronics Unit housing.
a. In a non-corrosive atmosphere, remove the top of the unit.
b. Unscrew the two screws securing the housing cover and open the
cover.
c. Unscrew the bolts securing metal bar and remove bar.
d. Disconnect the harness and reconnect new batteries.
e. Replace the metal bar and bolts.
f. Test the system (see
CAUTION. Do not short out battery leads when removing the batteries.
High currents may flow during shorts, and fire or personal injury may result.
THERE IS NO FUSE IN SERIES WITH THESE BATTERIES!
4-3.3
Recharging The Lead-Acid System Batteries
To recharge batteries, follow the instructions below.
NOTE. Recommended charge is 1/20 of the rated capacity, which will
maximize battery life and capacity.
The maximum charging current per manufacturer specification for these
types of batteries is 3A at 20°C. For a 12-volt battery the charging voltage
is 14.1 volts to 15.0 volts maximum. Please contact the specific battery
manufacturer for more details if required. Longer battery life and higher
capacity results if you charge batteries at a more moderate charging current
rate. In general, a charging current of 1/20 of the rated capacity is recom-
mended, which results in 0.6A for these batteries.
ADFM Technical Manual (January 2000)
Table 4-16, item
Chapter
5).
Maintenance
04). The nominal
page 4-3
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