Cause : Main circuit undervoltage comes when the main power is unstable or fails or voltage dip occurs during running.

Er.410 fault in inovance IS650 servo drive indicates Main circuit undervoltage. This means the main circuit voltage has dropped below the permissible limit. 

1. Ensure the power supply voltage is stable and within the specified range.
2. Check the power supply and replace it if necessary.
3. Check power input specification of servo drive.
4. Measure RST input voltage on servo drive side.