5 — DIAGNOSTICS & TROUBLESHOOTING
Table 5 TROUBLESHOOTING CHART, continued
LED
PROGRAMMER
CODE
LCD DISPLAY
EFFECT OF FAULT
RECOVERY
POSSIBLE CAUSE
4,3
Thermal Cutback
Output current reduced. 1. Current reduced during
1. Temperature
≥
Temp Cutback
overtemperature.
setpoint or
≤
-10°C.
2. Current reduced to 50% 2. Excessive load on motor or
during undertemperature.
controller.
3. Improper mounting of
controller.
4. Operation in extreme
environments.
5. Controller thermistor damaged.
4,4
Over Temperature
PWM output disabled.
Heatsink temperature
1. Heatsink temperature exceeds
≤
100°C.
the Temperature Cutoff
threshold (110°C).
Note: Faults related to the main contactor (LED codes 3,1 / 3,2 / 3,3 / 3,4)
are detected only when the main contactor is driven by the controller – wiring
configuration shown in Figure 4, and Rev Input / Main Driver parameter = 2
(see page 24). Also “Main contactor disabled” only applies when the main
contactor is driven by the controller – wiring configuration shown in Figure
4, and Rev Input / Main Driver parameter = 2 (see page 24).
Curtis 1204M/1205M/1209M/1221M Manual
29