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Battery charger
The batteries in the battery pack are wired in series
resulting in a 48 volt system. The battery charger for
this mower has an output of 54.5 volts so that the
whole battery pack is charged at one time.
To test the battery charger:
1.
Disconnect the charger from the mower.
2.
Plug the charger to an appropriate AC outlet.
3.
Set a DVOM to the volts DC scale.
4.
Attach the DVOM to the charger jack, the red (+)
lead to the pin next to the clip and the black(-)
lead on the other pin. See Figure 2.36.
Figure 2.36
5.
The meter should read 54.5 volts (+) .5 volts. If
the readings do not match this, replace the
charger.
NOTE: This charger is a two stage charger. The
initial stage will charge a battery pack at a volt-
age at a voltage of 57.6 volts (+) .5 volts. this
stage is used when the battery pack is fully dis-
charged. When the battery pack is charged, the
charger will switch to a float charge mode,
charging the battery pack at a voltage of 54.5
volts (+) .5 volts.
Battery indicator
This mower is equipped with a battery level indicator.
The indicator has five LEDs, the number of LEDs that
are lit is an indication of the voltage level of the battery.
It will only light up when the mower is in operation.
To test the battery indicator, a cheap tester can be
made from parts around the shop or buying the parts
from an electronic supply store. The components
needed are:
10K Ω variable resistor.
•
NOTE: A potentiometer, rheostat or a dash light
dimmer switch from a car can be used as a vari-
able resistor. If using a rheostat or a potentiome-
ter, multi-turn works best.
Clip
•
A fuse holder with a small fuse.
NOTE: A 1 amp fuse is recommended.
•
1 alligator clips.
•
1 female spade connector.
•
A jumper wire (to be used with the tester).
•
Wire.
To build the tester:
1.
Solder a one lead of the fuse holder to the center
tap pin of the variable resistor. See Figure 2.37.
The package of the variable resistor will have
a schematic drawing. In the drawing this is
the center tap.
2.
Solder an additional length of wire to the other
lead of the of the fuse holder.
NOTE: The over all length of the additional wire
and the fuse holder should be at least 12".
3.
Crimp the female spade connector onto the end
of the new fuse holder lead.
17
ELECTRICAL SYSTEM
Figure 2.37
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