A39 UNIVERSAL SCR CHARGER INSTRUCTION MANUAL
Page 5 of 8
THEORY OF OPERATION AND INDICATORS
OPERATION AND ADJUSTMENTS
1.
Permanently connect the battery to the charger before turning on the
AC
breaker.
(Observe battery
for proper polarity) Battery clips are not recommended.
2.
Turn on the
AC
breaker and then the on/off switch on the digital display. The unit will go through a
lamp test, flashing all LED
’
s and displaying "8888
”
. Then the
AC
contactor will pull in and digital
display will show battery voltage. The unit will default to the voltage of the battery drawing only a
small amount of current (20% maximum, the default current limit setting). The "ON
”
light should
now be lit indicating that the charger is now running.
3.
SETTING THE VOLTAGE: While in the "volts
”
mode, hold in the push to select switch and use the
adjust up/down switch until the desired voltage setting is reached. (To prevent overheating and
excessive gassing, set the voltage to 2.4Vpc on a fully discharged battery.)
4.
SETTING THE CURRENT LIMIT: Push the select button to the "Amps" mode, hold in the push to
select switch and use the adjust up/down switch until the desired current limit setting is reached.
5.
SETTING THE CHARGE TIME: Push the select button to the "Elapsed" "Time
”
mode, hold in on the
push to select switch and use the adjust up/down switch until the desired charge time is reached.
6.
The A39 will stay in current limit until the set voltage is reached. Once the set voltage is reached the
current will start to taper. The A39 will run for the specified amount of time and then go to a
"Complete" mode, which is indicated by the complete light. You can toggle through the different
modes, indicating battery voltage, amp-hours returned, and elapsed time once the A39 has turned
off. NOTE: If a fully charged battery is connected to the A39, the set voltage will be reached rapidly
and the DC current will taper, possibly turning the A39 off on Code 3 (low DC current).
7.
Before disconnecting the battery turn the
AC
breaker "OFF".
LAMPS & SWITCHES
1. "ON" Charge Lamp - indicates the charger is operating.
2. Complete (solid) - indicates the charger has turned off.
3. Current Limit (adjustable 10-100%) - indicates the unit is in current limit.
4. Failure - indicates the unit turned off because of low or high
AC
voltage or low current or high DC output (voltage,
current).
CODE 0001 Low
AC
input voltage
CODE 0002 High
AC
input voltage
CODE 0003 Low DC current
CODE 0005 High DC voltage and current
NOTE: Switch 7 on SW-1 will activate the low current shutoff when in the "ON" position. Switch 8 on
SW-1 will activate the timer when in the "ON" position. All other switches are factory set.
