Sigma 7 troubleshooting answers
7 questions with answers cited from the manufacturer manuals.
- 0Yaskawa Sigma-7 A.400 trips on deceleration, what to check?
An A.400 Overvoltage alarm on a Yaskawa Sigma-7 SERVOPACK indicates that the main circuit DC voltage is too high. If this alarm specifically occurs during deceleration, it points to issues related to regenerated energy. …
- 0Yaskawa Sigma-7 A.100 at servo ON, even unloaded: what to check first?
Alarm A.100 on a Yaskawa Σ-7 SERVOPACK indicates an overcurrent has flowed through the power transistor or the heat sink has overheated. This is a Gr.1 alarm and cannot be cleared with a simple reset. When it occurs imme…
- 0Yaskawa Sigma-7 A.d00 after rewiring, motor jerks: what to check?
The Yaskawa Sigma-7 SERVOPACK alarm A.d00, Position Deviation Overflow, indicates that the position deviation (following error) has exceeded the Pn520 setting. This often occurs during acceleration when the motor cannot …
- 0Yaskawa Sigma-7 A.810: Encoder Backup Alarm after motor replacement, what to check?
The A.810 Encoder Backup Alarm on a Yaskawa Sigma-7 SERVOPACK indicates that the absolute encoder has lost its position data due to a power supply failure. This alarm cannot be cleared with a standard alarm reset; the en…
- 0Yaskawa Sigma-7 A.720 after running for a while, what to check?
An A.720 alarm on a Yaskawa Sigma-7 SERVOPACK indicates a continuous overload, meaning the servomotor has been operating under a torque exceeding its rating for an extended period. This is a Gr.1 alarm and can be reset o…
- 0Yaskawa Sigma-7 A.710 after motor change, motor growls: what to check?
Alarm A.710 on a Yaskawa Sigma-7 SERVOPACK indicates an instantaneous overload, meaning the servomotor operated under a torque significantly exceeding its rating for a short period. This is a Gr.2 alarm and can be reset …
- 0Yaskawa Sigma-7 A.C90 at power-up, what to check first?
Alarm A.C90 on a Yaskawa Sigma-7 SERVOPACK indicates an Encoder Communications Error, meaning the SERVOPACK cannot communicate with the encoder. This is a Gr.1 alarm that requires the underlying cause to be resolved befo…