INSTRUCTION / TROUBLESHOOTING MANUAL FOR MODEL A70B
PAGE 9 OF 16
INSTALLATION
The LaMarche Model A70B charger is designed to operate on a specific type of battery with a specified number
of cells. The nameplate on the charger indicates the type and number of cells required. When connecting the
DC output cables to the battery, be certain the positive terminal of the charger is connected to the positive
battery terminal, and the negative terminal is connected to the negative of the battery. A grounding connection
is also provided for complete protection. Once properly installed, the unit should automatically complete its
charge cycle every time it is connected to a discharged battery. Install the unit so that the flow of air through
the ventilators is vertical and not obstructed.
A terminal block is provided within the unit for the AC input connections. Before connecting the AC input
cable, check the line power with that specified on the nameplate of the unit. Units with multiple AC input
units have taps inside which must be set for the proper AC setting. (See tap card inside door.) The AC input
current specified on the nameplate is for rated output.
Input AC breakers must be sized for the overload or current limiting point of the charger, which is 130% of the
rated nameplate value.
OPERATION
After the installation has been completed, the Model A70B is ready for operation. Be sure that the battery
charger is of the correct type for the battery that is to be charged.
CAREFULLY READ AND ADHERE TO ALL BATTERY AND BATTERY CHARGER INSTRUCTIONS AND
SAFETY WARNINGS.
To operate the charger, it is only necessary to turn on the on/off switch and connect a battery. After the on/off
switch is placed in the "on” position and prior to the battery connection, all of the LED’s on the front panel will
flash until a battery is connected. This is the lamp test mode. The digital display will hold four (4) eight's
("8888") until the proper battery is connected to the charger. When the battery is finally connected, the "ON
CHARGE" lamp will light and the digital display will indicate a slow increase in output current. The charger will
automatically start to charge the battery at some rate up to its maximum capacity depending upon the state of
charge of the battery.
START-UP
A. Turn 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. If a time delay before start up is required, the "dip" switch (S1) on the main circuit board may be
programmed. The "dip” switch has eight switches marked "1 through 8” mounted in a package which looks
similar to an integrated circuit. Switches 1 and 2 are used to program the delayed start time. Switch settings
for the various start delays are shown in Figure 1. To initialize a new switch setting, the on/off switch must be
turned "off" and then "on" again.
D. DO NOT change switches 3, 4, 5, 6, 7 or 8. These have been factory set. (See P25-LA70BDSS-1 . Page 1)
E. To select a constant current finish charge mode, constant voltage finish rate or extended cable lengths, the
dip switch (S2) on the S2A-122A circuit board can be re-programmed. The switches are factory set for a 10
foot cable length and a 10% constant current finish charge. Do not change switches 6, 7, and 8. (See P25-
LA70BDSS-1 , Page 2)
