36
Maintenance
Propel Circuit Board Troubleshooting
Curtis 1228 LED DIAGNOSTICS- Basic and Cylindrical
During normal operation, with no faults present, the status LED is steadily on.
If the controller detects a fault, the status LED provides two types of information.
First, it displays a slow flash (2 Hz) or a fast flash (4 Hz) to indicate the severity of the fault. Slow-flash faults are
self-clearing; as soon as the fault is corrected, the vehicle will operate normally. Fast-flash faults ("." in Table 2) are
considered to be more serious in nature and require that the key switch be cycled to resume operation after the fault
is corrected.
After the severity indication has been active for 10 seconds, the status LED flashes a 2-digit fault identification code
continuously until the fault is corrected. For example, code "1,4"-low battery voltage-appears as: one LED flash,
followed by a pause, then 4 LED flashes, and then repeats.
LED
CODE
PROGRAMMER LCD DISPLAY
EXPLANATION
POSSIBLE CAUSE
1,1
THERMAL CUTBACK
over-/under-temperature
cutback
1. Temperature >92°C or < -25°C.
2. Excessive load on vehicle.
3. Operation in extreme environ-
ments.
4. Electromagnetic brake not
releasing.
1,2
THROTTLE FAULT 1
throttle fault
1. Throttle input wire open or
shorted.
2. Throttle pot defective.
3. Wrong throttle type selected
1,3
SPD LIMIT POT FAULT
speed limit pot fault
1. Speed limit pot wire(s) broken
or shorted.
2. Broken speed limit pot.
1,4
LOW BATTERY VOLTAGE
battery voltage too low
1. Battery voltage <17 volts.
2. Bad connection at battery or
controller.
1,5
OVERVOLTAGE
battery voltage too high
1. Battery voltage >36 volts.
2. Vehicle operating with charger
attached.
3. Intermittent battery connection.
2,1
MAIN OFF FAULT
main contactor driver Off fault
1. Main contactor driver failed
open.
2,3
MAIN CONT FLTS
main contactor fault
1. Main contactor welded or stuck
open.
2. Main contactor driver fault.
3. Brake coil resistance too high.
2,4
MAIN ON FAULT
main contactor driver On fault
1. Main contactor driver failed
closed.
86037810 Chariot iVacuum
