Yaskawa troubleshooting answers
13 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…
- 0GA500 oH Heatsink Overheat: what to check first?
The GA500 oH fault indicates the heatsink temperature has exceeded the level set in L8-02. This often points to high ambient temperatures, insufficient cooling, or a heavy load. The drive will stop as configured by L8-03…
- 0Yaskawa GA500 oL1 after running a while, output current above FLA: what to check?
The oL1 fault on a Yaskawa GA500 drive indicates a motor overload, meaning the drive's electronic thermal motor protection has tripped. This fault can only be reset once the motor overload level (U4-16) is below 100. Com…
- 0Yaskawa GA500 trips GF at startup, what to check first?
A Yaskawa GA500 Ground Fault (GF) indicates a current short to ground on the output side of the drive, exceeding 50% of the drive's rated current. This fault can be triggered by damaged motor insulation, a shorted motor …
- 0GA500 Uv1 fault on a conveyor, what to check first?
A Uv1 fault on a Yaskawa GA500 drive indicates a DC Bus Undervoltage, meaning the DC bus voltage dropped below the level set in L2-05 while the drive was operating. This typically occurs when the input power supply is un…
- 0GA500 trips ov fault during deceleration, what to check?
An 'ov' overvoltage fault on a Yaskawa GA500 drive indicates the DC bus voltage exceeded its detection level, typically 410V for 200V class or 820V for 400V class drives. This often occurs during deceleration due to rege…
- 0Yaskawa GA500 trips oC instantly at start, even unloaded: what to check?
An oC fault on a Yaskawa GA500 drive indicates that the output current exceeded the specified overcurrent detection level. An instant trip at start, especially when unloaded, strongly suggests an issue with the motor cab…