User Manual
48
Curtis 1268 Manual, Rev. D
TROUBLESHOOTING CHART
LED PROGRAMMER
CODE LCD DISPLAY EXPLANATION
POSSIBLE CAUSE
1,1 HW FAILSAFE Self-test or watchdog fault. 1. Controller defective.
1,2 THROTTLE FAULT 1 Wiper signal out of range 1. Throttle input wire open.
(pot low fault). 2. Throttle input wire shorted to B+ or B-.
3. Throttle pot defective.
1,3 SPEED SENSOR FAULT No pulses from sensor. 1. Speed sensor not connected.
2. Speed sensor defective.
1,4 HPD High Pedal Disable fault. 1. Improper sequence of direction and
throttle inputs.
1,5 MOTOR STALL Motor stall at current. 1. Slope too steep for vehicle weight.
2. Mechanically locked motor.
3. EM brake wiring failure.
4. Speed sensor defective.
2,1 LOW BATTERY VOLTAGE Low battery voltage. 1. Battery voltage < undervoltage cutback
threshold.
2. Corroded battery terminal.
3. Loose battery or controller terminal.
2,2 OVERVOLTAGE Overvoltage. 1. Battery voltage > overvoltage shutdown
threshold.
2. Vehicle operating with charger attached.
3. Battery disconnected during regen
braking.
2,3 THERMAL CUTBACK Over-/undertemperature 1. Temperature > 85°C or < -25°C.
cutback. 2. Excessive load on vehicle.
3. Improper mounting of controller
4. Operation in extreme environments.
2,4 MAIN DRIVER ON Main contactor coil held low. 1. Main contactor missing or wire to coil
open.
2. Controller defective.
2,5 AUX COIL FAULT Missing aux (brake, relay) coil. 1. Aux coil open or not connected.
3,1 MAIN DRIVER OFF Main contactor driver held high. 1. Main contactor coil shorted.
2. Controller defective.
3,2 MAIN WELDED Main contactor welded. 1. Main contactor stuck closed.
2. Main contactor driver shorted.
3,3 PRECHARGE FAULT Internal voltage too low at 1. External short, or leakage path to B-
startup. on external B+ connection.
2. Controller defective.
3,4 FIELD MISSING Field winding fault. 1. Motor field wiring loose.
2. Motor field wiring open.
3,5 AUX DRIVER OFF Aux (brake, relay) driver held 1. Aux coil shorted.
high. 2. Controller defective.
4,1 CURRENT SENSE FAULT Armature or field current 1. Controller defective.
sensor fault.
4,2 DRIVER OVERCURRENT Contactor driver or aux driver 1. Contactor or aux coil shorted.
overcurrent.
4,3 M- SHORTED Internal M- short to B-. 1. Controller defective.
4,4 AUX RELAY DNC Aux relay did not close. 1. Aux relay missing or wire to coil open.
6 — DIAGNOSTICS & TROUBLESHOOTING