[Servo board XX](Power regeneration amplifier (No.XX)) Current sensor disconnected or abnormal. (U) (for E0x series controllers)

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

Description: The U-phase regenerative current detection circuit on the power module board for the power regeneration axis is damaged, or there is a problem with the servo board signal cable.

Servo FPGA
Current feedback
Servo board
PWM
Current detection
Reactor unit
Circuit
IPM
External power supply
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. A poor harness connection between the power block for the power regeneration axis and servo board.

4. A problem with the power supply unit.

Countermeasures:

1. Replace the servo amplifier unit.

2. Replace the servo board.

3. Replace the power supply unit.