ASC+ System Auto Split Charge & Engine Start Protect
User Guide and Installation Instructions
Document No 13362 Issue 04
Page 14 of 21
ASC overvoltage protection
If the ASC contactor is closed and a high voltage (12V system >15V, 24V system >30V) is
detected on the contactor studs for longer than 3 seconds the contactors will open after, the
“Battery Link” switch LED will flash see Figure 4 on page 16 for the flash patterns during this
mode.
Fault finding and flow charts
ESP contactor close self test
The system checks the operation of the battery isolation contactor by measuring the voltage
applied to the load after the contactor is pulsed “On”. If battery voltage does not appear at the
load, then the system re-tries up to 10 times at 5 second intervals. If, after 10 attempts, the
load stud supply is still not detected, the system logs the contactor as “off” and the “Engine
Battery On/Off” switch LED will indicate the contactor “Off” state. If the contactor is closing
but the switch LED is indication an “Off” condition check the primary ESP contactors in-line
fuses and associated wiring.
Power on flash pattern (2 or 5 flashes)
Whenever the control module has powered applied, calibration data is read from memory.
Once this is completed; both switch indicator LEDs flash twice to indicate a successful read.
This should only be seen when the system is first connected; if this is seen during operation,
it indicates a DC supply problem.
If 5 flashes are seen when the system is first connected; this indicates that there was a
problem reading the calibration data. The module will still function, but with reduced
accuracy. This indicates a fault, which should be investigated as soon as possible.
Incorrect operation
If the system does not operate as expected, check (using Figure 2) all connections to the
contactor studs. Ensure that the Batteries & Loads are connected to the correct contactors
and correct studs, and that the thin black wire with the red sleeve is connected to the “Battery
Positive” stud.
