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LED Display AL FLT
Motor
Overload
Drive
Overload
DC
Overvoltage
Input Phase
Loss
Braking
Transistor
Fault
IGBT Short
Circuit
DC
Undervoltage
Controller
Undervoltage
YASKAWA ELECTRIC TOEP C710606 15E - AC Drive V1000 - Quick Start Guide
Cause
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.
The load is too heavy.
The drive capacity is too small.
Too much torque at low speed.
DC bus voltage rose too high.
The deceleration time is too short.
Stall prevention is disabled.
Braking chopper / resistor broken.
Unstable motor control in OLV.
Too high input voltage.
Input voltage drop or phase imbalance.
One of the input phase is lost.
Loose wires at the drive input.
The internal braking transistor is broken.
IGBT short circuit detection and circuit
fault
The voltage in the DC bus fell below the
undervoltage detection level (L2-05).
The power supply failed or one input phase
has been lost.
The power supply is too weak.
The drives controller power supply voltage
is too low.
7 Troubleshooting
Corrective Action
• Reduce the motor load.
• Use a motor with external cooling and set
the correct motor in parameter L1-01.
• Check the sequence.
• Check the rated current setting.
• Check the load.
• Make sure that the drive is big enough to
handle the load.
• The overload capability is reduced at low
speeds. Reduce the load or increase the
drive size.
• Increase the deceleration time.
• Enable stall prevention by parameter
L3-04.
• Make sure the braking resistor and
braking chopper are working correctly.
• Check motor parameter settings and
adjust torque and slip compensation, AFR
and hunting prevention as needed.
• Make sure that the power supply voltage
meets the drives specifications.
• Check the motor wiring.
• Make sure all terminal screws in the drive
and motor are properly tightened.
• Check the motor and drive capacity.
• Cycle the power supply.
• Replace the drive if the fault reoccurs.
• Check motor wiring
• Cycle power to the drive.
• If the problem continues, contact your
YASKAWA representative or the nearest
YASKAWA sales office.
• Check the power supply.
• Make sure, that the power supply is
strong enough.
• Cycle power to the drive. Check if the
fault reoccurs.
• Replace the drive if the fault continues to
occur.
EN 35
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