YASKAWA A1000 Quick Start Manual page 35

Digital Operator AL FLT
Safe Disable Fault

HbbF
Output Phase Loss

PF
Overcurrent

oC
Heatsink Overheat
 
oH or oH1
Motor Overload

oL1
Drive Overload

oL2
DC Overvoltage
 
ov
Input Phase Loss

LF
Braking Transistor
Fault

rr
Thermistor
Disconnect
 
THo
DC Undervoltage
 
Uv1
Controller
Undervoltage

Uv2
DC Charge Circuit
Fault 
Uv3
YASKAWA Europe TOEP C710616 88A - AC Drive A1000 IP23/54 Floor Standing - Quick Start Guide
Cause
Drive output is disabled while only one of the Safe
Disable inputs is open. (normally both input signals H1
and H2 should be open)
• One channel is internally broken and does not switch
off, even if the external signal is removed.
• Only one channel is switched off by the upper
controller.
Output cable is disconnected or the motor winding is
damaged.
Loose wires at the drive output.
Motor is too small (less than 5% of drive current).
Short circuit or ground fault on the drive output side
The load is too heavy.
The accel./decel. times are too short.
Wrong motor data or V/f pattern settings.
A magnetic contactor was switched at the output.
Surrounding temperature is too high.
The cooling fan has stopped.
The filter mats are clogged.
The airflow to the heatsink is restricted.
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.
The motor thermistor is not connected properly.
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.
The charge circuit for the DC bus is broken.
7 Troubleshooting
Corrective Action
• Check the wiring from the upper controller and make
sure that both signals are set correctly by the
controller.
• If the signals are set correctly and the alarm does not
disappear, replace the drive.
• Check the motor wiring.
• Make sure all terminal screws in the drive and motor
are properly tightened.
• Check the motor and drive capacity.
• Check the output wiring and the motor for short
circuits or broken insulation. Replace the broken
parts.
• Check the machine for damages (gears, etc.) and
repair any broken parts.
• Check the drive parameter settings.
• Check the output contactor sequence.
• Check the surrounding temperature and install
cooling devices if necessary.
• Check the drive cooling fan.
• Replace filter mats.
• Check the airflow around the heatsink.
• 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 as needed.
• Make sure that the power supply voltage meets the
drives specifications.
• Check the power supply.
• Make sure that all cables are properly fixed to the
correct terminals.
• Cycle the power supply.
• Replace the drive if the fault reoccurs.
Check the wiring for the thermistor.
• 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.
• Cycle power to the drive. Check if the fault reoccurs.
• Replace the drive if the fault reoccurs.
EN 35