Driver Error

What does E30. mean?

A driver error indicates a fault detected by the inverter's internal driver IC, protecting the main power elements (e.g., IGBTs). This can be triggered by severe momentary overcurrents (above 350% of rated), abnormal internal temperatures, or a drop in the main element drive power supply. This fault prevents inverter restart and usually requires internal component inspection.

• Severe momentary overcurrent (e.g., >350% of rated current) due to an instantaneous short circuit in the motor wiring or within the motor windings.
• Failure of an IGBT module (e.g., internal short, gate-emitter short) causing the gate driver to detect an abnormal condition and trip.
• High frequency noise or significant voltage spikes on the DC bus disturbing the gate driver IC's operation, leading to false trips.
• Faulty gate driver board or component on the inverter's main power board responsible for controlling the IGBT switching.

Click steps to track your progress.

1. 1

   Disconnect power. Perform a diode check on the IGBT modules between the DC bus terminals (P and N) and the output terminals (U, V, W) for shorts or open circuits.

2. 2

   Disconnect the motor from the inverter output terminals (U, V, W). Power up the inverter without the motor connected. If the fault clears, the motor or motor cable is suspect.

3. 3

   Measure the insulation resistance of the motor windings to ground and between phases using a megohmmeter (e.g., 500VDC test voltage). Expected reading should be >1MΩ.

4. 4

   Inspect the motor cabling for any signs of damage, chafing, or short circuits, especially where cables enter conduits or terminal boxes.

5. 5

   If the fault persists with the motor disconnected and IGBTs test good, the gate driver board or main power board likely has an internal defect and requires replacement.