CT Oh fault code meaning

CT / Oh

Series: Commander CDE/CDLE

Oh 4

AC drive

Meaning: Heatsink over-temperature

Possible causes

Source: CT Control Techniques Commander CDE/CDLE User Guide 9 Trip codes P9-1–9-2

Series: Vector

Heat sink over-temperature

AC drive

Meaning: Heat sink over-temperature. The heat sink has reached its upper safe working limit due to loss of ambient air or ambient air too hot, PWM switching frequency too high, or heat sink thermistor circuit open-circuit. This code may also indicate (V3700 - V7500 drives only) that the inrush contactor (in the DC bus) has failed to close.

Possible causes

Source: