La Marche A75M Instruction - page 8
INSTRUCTION / TROUBLESHOOTING MANUAL FOR MODEL A75M
PAGE 8 OF 13
START-UP
A. Place the on/off switch to the "ON" position. Apply AC voltage to the units input terminals. Four (4) eight's
("8888") will flash on the display.
B. To select the equalize charge mode, activate the "EQUALIZE" switch on the front panel. If the equalize
mode is selected, the "EQUALIZE" LED will be on.
C. Connect the battery to the charger. After a 20 second delay, which assures proper battery connection, the
AC contactor should close and the on charge light should turn on. The battery charger should start to charge,
showing output amps on the digital display. This completes the "Autostart” sequence. If a battery with the
wrong number of cells is connected or the AC input line voltage is not present, the unit will not start and the
"FAILURE" light will be on. The digital display will indicate the cause of failure. This condition will also occur if
the battery being connected is discharged so deeply that the open terminal voltage will not come up to the 1.6
volts/cell required to initiate the start cycle.
NOTE: To disable this feature push the equalize button. Caution: Make sure a battery with the correct
number of cells is connected to the charger.
D. A75M can be programmed.
E. When the "80% CHARGE” point is reached in the charge cycle, the "80%/COMPLETE" light will flash. There
will be an additional 3 hours (6 hours in the equalize mode) of charge after this point is reached.
F. When the charge cycle is completed, the charge "80%/COMPLETE" light will turn on solid and the "ON
CHARGE" lamp will turn off. The display will also alternate at one second intervals between the "AMP HOURS",
"CHARGE TIME" and "COOLING TIME". The "COOLING TIME" is the time since the charge cycle completed and
is indicated in hours and minutes. When showing the "CHARGE TIME" the "AMP HOURS" light will be OFF and
the elapsed time LED will be ON. When showing the "COOLING TIME" the "AMP HOURS" light will be ON and
the elapsed time light will be ON.
G. If for some reason the AC input voltage fails, the "FAILURE” light will turn ON and the battery charger will
turn OFF. The display will indicate number "0001". During this interval, the time registers in the SCR are held
at their present count. When the AC has returned to normal, the charge cycle resumes where it left off and the
failure light turns off.
H. If for some reason the normal, equalize, or rate timers do not terminate the charge cycle in less than 12
hours, the override timer will time out, shut down the charger and turn on the "FAILURE" light. The display will
indicate number "0004".
I. If for some reason, the unit output voltage exceeds 2.7 v/c max for 20 sec, an independent software
shutdown will stop the charger. The display will indicate number "0005." In this condition, the lamps will not
update and the unit will not turn back on until the on/off switch has been toggled. The A75M will reset back to
the autostart mode when the battery is disconnected, or when the on/off switch is turned "OFF" and then "ON"
again.
J. If a fully charged battery is connected, the charger will turn off in fifteen (15) minutes and the Code 0007.
To bypass this function, push the equalize switch and the unit will charge the battery for up to six (6) additional
hours.
NOTE: TURN THE ON/OFF SWITCH TO THE OFF POSITION BEFORE DISCONNECTING THE
BATTERY DURING A CHARGE CYCLE. (After the battery is disconnected, return the on/off switch
to the "ON" position to activate the autostart function.)