SV1054 Overcurrent (Beta i-Series) fault in Fanuc drive

SV1054 Overcurrent (Beta i-Series) fault in Fanuc drive

Description

SV1054 is the "Short Circuit" alarm for Beta i-Series drives. It is the Beta equivalent of the Alpha SV0438. It means the current passing through the output transistors exceeded the hardware trip point. Because Beta drives are often integrated (converter and inverter in one box), this alarm can indicate failure in either the motor output or the internal DC bus regulation.

Cause

• Motor Short: The Beta motor has failed (coolant ingress).
• Cable Short: The power cable rubbing against the casting.
• Module Failure: The power hybrid module (IPM) inside the Beta unit has blown up.

Solution

1. Disconnect Motor: Unplug the power connector (U, V, W). Cycle power. If SV1054 remains, the drive is dead.
2. Megger Motor: Test the motor insulation. Beta motors are small and overheat easily if the machine duty cycle is high.
3. Replace Unit: Beta drives are generally not serviceable at the component level in the field. Replacement of the entire unit is standard.