[Servo board XX] (Power regeneration amplifier (No. XX)) current sensor voltage exceeds the upper limit. (U) (for E0x series controllers)

Error handling: Motor power OFF.
Error reset: Possible.

Description: The regenerative current detection circuit on the power block board for the power regeneration axis detected a voltage exceeding the upper limit.

Servo FPGA
Current feedback
Servo board
PWM
Current detection
Circuit
External power supply
IPM
Reactor unit
Power block for power regeneration axis
Controller

Main causes:

1. A problem with the power block for the power regeneration axis.

2. A problem with the servo board.

3. There is a short circuit between phase U, V, or W and the ground wire in the wiring between the power block for the power regeneration axis, reactor unit, power regeneration unit, and external power supply.

4. A problem with the power regeneration unit.

5. The reactor unit is faulty.

6. A problem with the power supply unit.

Countermeasures:

1. Replace the servo amplifier unit.

2. Check the wiring between the power module for the power regeneration axis, reactor unit, power regeneration unit, and external power supply for short circuits, ground faults, or open circuits. Replace the reactor unit or harness if necessary.

3. Replace the power regeneration unit.

4. Check the reactor unit for abnormalities such as a short circuit.

5. Replace the power supply unit.