Curtis 1212S Manual,
Rev. B
33
Table 2 TROUBLESHOOTING CHART
CODE
FAULT
POSSIBLE CAUSES
EFFECT OF FAULT
RECOVERY
1, 1
Thermal Fault
1. Temperature >80°C or <-10°C.
Overtemp: Current limit
Correct fault.
2. Excessive load on vehicle.
cutback starts at 80°C with
3. Operation in extreme environments. complete cutoff at 105°C,
4. EM brake not releasing.
Undertemp: Current limit
cutback starts at -10°C and is
reduced to 50% at -25°C.
1, 2
Throttle Fault
1. Throttle input wire open or shorted. Controlled deceleration to
Correct fault.
2. Throttle defective.
neutral.
3. Wrong throttle type selected.
1, 4
Undervoltage
1. 1212S-2xxx: battery voltage <17.0 V. Current limit reduced linearly Correct fault.
Fault
1212S-3xxx: battery voltage <25.5 V. from 100% to zero, to keep
2. Bad connection at battery or controller. battery voltage from falling
below main relay dropout voltage
(<14V for 1212S-2xxx, and
(<21V for 1212S-3xxx).
Self resetting upon battery
voltage rising to within
operational limits.
1, 5
Overvoltage Fault
1.1212S-2xxx: battery voltage >31.0 V. Current limit reduced linearly Correct fault.
1212S-3xxx: battery voltage >46.5 V. from 100% to zero. Self
2. Vehicle operating with charger attached. resetting upon battery voltage
3. Intermittent battery connection.
falling to within operational
limits.
2, 1
Main Off Fault
1. Main relay driver failed open.
Bridge is shorted and throttle Correct fault.
set to zero.
2, 2
EMR Sequencing
1. Emergency Reverse (belly button)
Throttle output inhibited.
Correct fault by
Fault
switch pressed before KSI on.
releasing belly button.
2, 3
Main Fault
1. Main relay welded or stuck open.
Driving is disabled.
Correct fault;
2. Main relay driver fault.
cycle KSI.
2, 4
Main On Fault
1. Main relay driver failed closed.
Controlled deceleration to
Correct fault.
neutral.
2, 5
Pump SRO Fault
1. Pump switches pressed before KSI on. Lift lockout output is disabled Correct fault.
if Lift Lockout Enable = On.
3, 1
Wiring Fault
1. Misadjusted throttle.
If fault present continuously
Correct fault;
2. Broken throttle pot or throttle
for 10s, HPD fault is latched. cycle KSI.
mechanism.
3, 2
Brake On Fault
1. EM brake driver shorted.
Controlled deceleration to
Correct fault.
2. EM brake coil open.
neutral.
3, 3
Precharge Fault
1. EM brake driver shorted.
Main relay will not close and Correct fault;
2. Precharge circuit damaged.
bridge is shorted.
cycle KSI.
3. MOSFET failure.
3, 4
Brake Off Fault
1. EM brake driver open.
Bridge is shorted and throttle Correct fault.
2. EM brake coil shorted.
set to zero.
3, 5
HPD Fault
1. Improper sequence of throttle and
Controller held in neutral as
Correct fault.
KSI or interlock inputs.
long as the throttle request
2. Misadjusted throttle pot.
exceeds the neutral deadband
at interlock turn-on. Fault is
cleared by releasing throttle.
7 — DIAGNOSTICS & TROUBLESHOOTING
