Table 6. Charger LEDs
Indicator Color Function
Power On Red Illuminates continuously
when AC power is present.
Abnormal
Shutdown
Red Flashes if abnormal shut-
down has occurred.
Detection
Error
Red Illuminates continuously
when battery is not con-
nected to charger or bat-
tery voltage is less than
2V.
Charging Yellow Charge status indicator -
flashes during charging cy-
cle.
Charged Green Illuminates continuously
when battery is fully
charged.
Charging
WARNING
The charger comes factory set to the battery in-
stalled at the factory and must be changed if us-
ing different batteries. Using an improper charger
mode for your battery pack may cause severe
damage to batteries or charger. Refer to Charger
Mode/Battery Type Selection (Accusense 20A) in
this section to verify the proper mode setting for
your battery pack.
Mode settings can be checked by connecting the bat-
tery charger to a 120V AC power source and watch-
ing the LED display. The LED display on the charger
will flash to indicate the selected battery mode. Con-
sult Table 7 to determine the selected mode. If the
LEDs do not flash when initially connected to power,
refer to Troubleshooting (Accusense 20A Chargers) in
this section.
Plugging the charger to the 120 volt AC outlet will be-
gin the start up cycle. Approximately three seconds
after connection to the AC power, all five LEDs on the
top of the charger will illuminate and flash two times.
This indicates the charger is set to Mode 2. Following
the start up flashing of the LEDs, the red, POWER
ON, LED will illuminate to indicate AC power is ap-
plied to the charger and will begin the charging cycle.
The charger uses a 6-step charging process:
1. Pre-Qualification Test
During this step, the yellow, CHARGING, LED
will flash on and off every two seconds. The
charger is checking for faults prior to the start
of charging. Depending on the condition and
state of charge of the batteries, this step can
take from 5 seconds up to 5 hours. This stage
lasts 15 seconds unless battery voltage is be-
low 21V. If the battery voltage is below 21V,
the charger will charge the battery with low cur-
rent until battery voltage reaches 21V. When
battery voltage is above 21V, regular charging
begins.
2. Regulating Current
This step is sometimes referred to as Bulk
Charge. During this step, the charger will
charge at constant current mode, which is nor-
mally the charger's full rated RMS output. The
yellow, CHARGING, LED will be constantly illu-
minated during this step.
3. Constant Charge
This step is sometimes referred to as Absorp-
tion Charge or Top Off stage. During this step,
the charger will regulate the voltage at a con-
stant rate while slowly decreasing the bulk
charge current. The yellow, CHARGING, LED
will remain illuminated. When the batteries
have reached 80 to 90 percent of full charge,
the yellow, CHARGING, and the green,
CHARGED, LEDs will be illuminated.
4. Charge Complete
During this step, only the green, CHARGED,
LED will remain illuminated. AC power can now
be disconnected from the charger.
5. Recycle Stage
If the charger remains connected to power for
a period of days (40 days when Mode 2 is se-
lected), a completely new charge cycle will be-
gin to keep batteries fully charged during long
periods of not being used.
Battery Charger (Accusense
®
20A)
2200 YRM 1007
46
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