DC Link Not Charged

What does V4 mean?

The V4 (Red) LED indicates that the DCLINK circuit inside the servo amplifier is charged to the specified voltage. If this LED does not light after the pre-charge sequence is finished, it suggests a problem with the DC link charging, potentially due to a short circuit or a defective charge current control resistor.

• DC link capacitor bank not adequately charged.
• Main power supply voltage is too low (e.g., P6-01).
• Faulty rectifier or charging circuit in the power module.
• Inrush current limiter failure.

Click steps to track your progress.

1. 1

   Check the DC Link circuit for a short-circuit connection.

2. 2

   Replace the emergency stop unit, as the charge current control resistor may be defective within it.

3. 3

   Replace the servo amplifier.