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Source MAIN and BATT LED’s on the Programmer
The Main and Batt LED’s at the top of the programmer unit keypad indicate which power source the CPi2 is getting
its power from.
Under normal conditions with 12 volt mainbus power turned on and above 10.2(Pb),11.6(Lithium) volts, the green
MAIN LED should be lit and the BATT LED should be off.
If the Mainbus voltage falls below 10.3(Pb), 11.7(Lithium) volts, the green Main LED will turn off and the BATT red
LED will turn on, indicating power is being drawn from the backup battery. This indicates there must be a problem
with Mainbus power supply, either a broken connection, fuse, breaker or wiring problem or alternator/charging
problem if voltage is low. Below are 4 scenarios you may see on the programmer.
Normal condition with good Mainbus voltage, and
good backup battery voltage. MAIN LED lit. Batt LED
not lit.
Mainbus voltage is low, but not low enough for the
CPi2 to switch over to backup battery power. Fault
LED is lit indicating lower than 12.5(Pb) volts on the
Mainbus power source.
If Mainbus voltage is below 10.3(Pb) volts, then the
CPi2 will switch over its power source to the backup
battery, so MAIN led goes off, BATT LED is lit up, and
Fault LED will be lit also.
Note right arrow in LCD display is pointing to 13.2
Battery side. Arrow just mirrors the MAIN & BATT
LEDs.
MAIN and BATT can be lit at the same time when
there Mainbus 12 volts to the cpu purple power wire,
but no power to the coil power source wire of the CPi2
unit.
When there is no coil power supplied to the CPi2 then
it will switch its coil pack power source over to the
backup battery, while the CPU is running on Mainbus
power.
If the backup battery is below 7.5 volts the CPi2 will not switch over to the backup battery.
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