INSTRUCTION / TROUBLESHOOTING MANUAL FOR MODEL A70B
PAGE 6 OF 16
THEORY OF OPERATION & INDICATORS
FRONT PANEL
The front panel consists of a printed wiring board which is connected to a microprocessor board through a
keyed 26 pin ribbon cable.
The panel has a digital display, select button, equalize button, on/off switch and eight (8) LED lamps.
The digital display indicates Output Amps, Output Voltage, Ampere Hours Returned, and Elapsed Time
Charging.
A "Push to Select” button and associated indicator lights allow you to read any one of the four (4) operating
parameters on the digital display. After powering up the unit and connecting the battery, the digital display
indicates the output amperage of the charger; push the "Select” button once and the output voltage will be
displayed. Push the "Select” button a second time and the Amp Hours Returned will be displayed.
NOTE: The Charger must be charging the battery for 1 minute to obtain this reading; the amp hours are
updated every minute. A third push of the button shows the elapsed charging time in hours/minutes.
A "Push to Equalize” button when pushed allows the charger to charge six (6) additional hours after the 80%
charge is reached.
NOTE:
The equalize button can also be used to start the charger even if a battery is discharged below 1.6
Vpc. Caution must be used when using this feature to start the charger because the initial battery voltage
sensing is being disabled and the wrong battery could be being connected.
An "On/Off” switch allows you to turn off the charger when disconnecting the battery during the charge cycle.
The lamps are as follows:
* "On Charge" Lamp
This indicates after the charger has successfully completed the autostart cycle and the input contactor has
closed.
* "80%/Complete" Lamp
This (LED) indicator will flash when the battery voltage reaches 2.40 volts per cell. This means the battery is
80% charged. The 3 (normal) or 6 (equalize) hour timer is activated. This (LED) also gives you valuable
information after the charger has completed its charge cycle and the ("On Charge") LED is off.
A. Flashing at one second intervals indicates the electronic timer has completed its normal
cycle and the battery is fully charged.
B. Rapid flashing indicates a low output current shutoff. Usually this indicates a fully
charged battery.
C. Flashing at five second intervals indicates a fully charged battery was connected to the
charger and it turned off after charging for 15 minutes. The display will also alternate
between time (15 minutes) and voltage.
* "Equalize" Lamp
Lamp indicates when the equalize mode is activated by the equalize switch.
* "Failure" Lamp
The "FAILURE” lamp is a summary alarm. When the failure light illuminates, the number on the digital display
indicates the type of failure. See below:
1) Low AC voltage
0001
4) 12 hour override timer time out. 0004
2) High AC voltage 0002
5) High DC current/voltage 0005
3) Wrong size battery (cells). 0003
6) Possible shorted cells or defective battery 0006
