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