7 Troubleshooting
EN28
YASKAWA Electric
TOEP C710606 27 AC Drive - J1000 Quick Start Guide
Heatsink
Overheat
• Surrounding temperature is too high.
• The cooling fan has stopped.
• The heatsink is dirty.
• The airflow to the heatsink is restricted.
Motor
Overload
• The motor load is too heavy.
• The motor is operated at low speed with heavy load.
• Cycle times of accel./ decel. are too short.
• Incorrect motor rated current has been set.
Drive
Overload
• The load is too heavy.
• The drive capacity is too small.
• Too much torque at low speed.
DC
Overvoltage
DC bus voltage rose too high.
• The deceleration time is too short.
• Stall prevention is disabled.
• Braking chopper/ resistor broken
• Too high input voltage.
Input Phase
Loss
• Input voltage drop or phase imbalance.
• One of the input phase is lost.
• Loose wires at the drive input.
DC
Undervoltage
The voltage in the DC bus fell below the undervoltage detection level.
• The power supply failed or one input phase has been lost.
• The power supply is too weak.
DC Charge
Circuit Fault
The charge circuit for the DC bus is broken.
LED Display ALM FLT
Cause
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