Inverter Overvoltage

What does E47 mean?

The inverter has detected an overvoltage condition, indicating that the DC bus voltage has exceeded its safe operating limit. This can be caused by regeneration from the compressor motor or an unstable incoming power supply.

1. 1

   Measure the DC bus voltage at the inverter's +UDC/-UDC terminals — verify it is within the specified range for the input voltage (e.g., 540-750VDC for 400V input).

2. 2

   Check the incoming AC line voltage at the main power terminals for stability and overvoltage conditions.

3. 3

   Inspect the inverter's braking resistor circuit and its connections if applicable to your unit.