INSTRUCTION / TROUBLESHOOTING MANUAL FOR MODEL A70B
PAGE 8 OF 16
In the normal mode, the charger will charge the battery for 3 hours after the 80% point is reached (unless the
rate program terminates the charge first) or the battery is disconnected. In the equalize mode, a 6 hour timer
is initiated after the 80% point is reached.
A momentary equalize switch is provided so that equalizing may be selected to give a 6 hour charge after the
80% point is reached. Equalizing should be done periodically as recommended by battery manufacturer. This
switch, when activated, will start the equalize charge mode for that cycle only. After completion of the cycle,
the charger will automatically be reset to the "normal" mode.
When the 80% point is reached, the 80% charge lamp will flash at a one second rate. At this point, the timer
in the microprocessor is set for 3 or 6 hours depending on whether or not the equalize mode is active. The
charger will continue the trickle rate until the microprocessor control turns unit completely off. When a charging
cycle is completed correctly, the 80%/Complete light will indicate until the battery is unplugged. Unplugging a
charged (charge complete light "On") battery will place the unit back in the autostart mode.
Disconnecting the output connector while a battery is being charged is not recommended.
If the
battery is disconnected during a charge cycle, the complete light will not light, all timers will reset, and the unit
will go into the autostart mode.
If the battery never reaches the 80% charge point (due to battery failure), the unit will turn off in 12 hours
from the override timer. The complete light will not light. The "ON CHARGE" light will turn off, the "FAILURE"
lamp will light and the display will indicate "0004." If this occurs, the unit will not autostart. The on/off switch
will have to be turned off to reset the lights and turned back on to initiate the autostart mode. If the AC input
voltage goes below the AC voltage set point, the unit will stop and the failure lamp will light. When the AC is
restored, the unit will turn on again and resume the charge where is left off. A high voltage condition will also
cause the failure light to come on. (0001 - Low AC voltage, 0002 - High AC voltage)
After starting, the microprocessor immediately activates the 12 hour override timer. This timer is independent
of battery conditions and overrides all other timing functions. The override timer will terminate the charge in
the event that the rate control or the 80% timing control does not terminate the charge before the maximum
time limit of 12 hours is reached.
If the AC input line fails during the charge cycle, all internal time registers will hold their count until the power
returns. The cycle will then resume from where it left off. The "FAILURE" lamp will light if this condition is
reached and, depending on a low or high AC line, a "0001" (low) or "0002" (high) will indicate on the display.
Optional remote start inputs can be provided so that the charger start up and timer initiation may be controlled
from elsewhere. The battery and "Autostart" conditions must, however, still be met.
A start up delay (measured from the time of valid battery connection) can be pre-selected by a printed circuit
board switch for 0,1,4, or 8 hours. This delay will operate both in the normal or equalize modes. When the
start up delay is active, the "ON CHARGE" light will flash at a one second rate until the delay is complete and
the digital display will show how much time remains until the charger will turn on. Upon completion of the
delay, the charger will perform the "Autostart" function.
A high DC current, high DC voltage feature is incorporated in the charge control system. If an unusually high
DC current occurs simultaneously with a high voltage condition as a result of a charger malfunction, the high
current feature will terminate the charge cycle and turn on the "FAILURE" light. A "0005" will indicate on the
digital display. In this mode the charger will not restart again unless the on/off switch is toggled to the "off"
and then to the "on" position. If the high current failure still exists the charger will again turn off.
At this
point, a factory service representative should be contacted.
