INSTRUCTION / TROUBLESHOOTING MANUAL FOR MODEL A75MD
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FRONT PANEL INDICATORS
The membrane panel incorporates a Vacuum Fluorescent Display (VFD), Mode button for selecting Standard or
Equalize Charge or change calibration settings, UP and DOWN arrow buttons, for navigating through the display
options and calibration settings, and indicator LEDs.
The VFD indicates Output Amps, Output Volts, Ampere Hours Returned, Elapsed Time, Charge Time and
Cooling Time (elapsed time from end of charge) as well as Date and Time.
UP and DOWN arrow buttons allow scrolling thru the operating parameters on the VFD. After powering up the
unit and connecting the battery, the digital display indicates an available parameter. Press the UP or DOWN
arrow buttons to scroll through the available parameters.
NOTE: The Charger must be charging the battery for 1 minute to obtain the “A-H returned” reading; the amp
hours are updated every minute.
The MODE button, when pressed during standard charge cycle, puts the charger in Equalize mode.
A green “START” pushbutton is used to start the charger.
A red "STOP" pushbutton allows turning off the charger when disconnecting the battery during the charge
cycle.
The lamps are as follows:
* "Charger On" Lamp
This (LED) indicator will light after the charger has successfully completed the autostart cycle and the
AC contactor has closed.
* "Ramp Up" Lamp
This (LED) indicator will light after the charger starts and is in the Ramp Up stage.
* "Start Rate” Lamp
This (LED) indicator will light when the charger is charging at the Start Rate stage.
* "Constant Voltage" Lamp
This (LED) indicator will light when the charger is charging in the Constant Voltage stage.
* "Finish Rate” Lamp
This (LED) indicator will light when the charger is charging in the Finish Rate stage.
* "Data Logging Active" Lamp (in units equipped with data logging)
This (LED) indicator will flash when the Data Logger is actively recording data.
* "Fault" Lamp
There are several conditions that will cause this (LED) to light.
1. AC Power Failure – In case of the AC input voltage failure the "Fault" lamp will flash and the display
will show AC Failure.
2. High Voltage Shutdown – If the output voltage rises above 2.7 volts per cell, the "Fault" lamp will
light. The display will show "High Voltage".
3. Override Timer – If the battery does not reach 80% charge to initiate the 3 or 6 hour timer, or if the
timer circuit fails, the override timer will shut the charger off after 12 hours of charging. The "Fault"
lamp will light and the VFD will display "Override Timer".
4. Phase 1 Override Timer - If the charge curve does not reach Phase 2 / Constant Voltage stage within
appropriate time limit (default - 6 hours), Phase 1 override timer will occur and terminate the charge.
