8 Troubleshooting
EN 46
YASKAWA Europe
TOEP C710606 50B - AC Drive L1000V - Quick Start Guide
Motor
Overload
• The motor load is too heavy.
• Acceleration and deceleration cycle times
are too short.
• Value set for the motor rated current is
incorrect.
• Check the elevator mechanics.
• Check the sequence.
• Check the rated current setting.
Drive
Overload
• The load is too heavy.
• The drive is too small.
• Too much torque at low speed.
• 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.
DC
Overvoltage
• DC bus voltage rose too high.
• Braking transistor is too small
• Braking chopper or resistor is broken.
• Unstable motor control in OLV.
• Input voltage is too high.
• 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.
Over Speed
• F1-03 is set to 0, 1, or 2 and the motor
speed exceeded the value of F1-08 for lon-
ger than the time set in F1-09)
• Check and adjust the speed control loop
settings (C5-
)
• If an external speed reference signal (ana-
log, etc.) is used make sure the signal is ok.
• Check the settings of F1-08 and F1-09.
• F1-03 is set to 3 and the motor speed
exceeded the value of F1-08 for longer
than the time set in F1-09)
Input Phase
Loss
• Input voltage drop or phase imbalance.
• One of the input phases is lost.
• Drive input wire are loose.
• Check the motor wiring.
• Make sure all terminal screws in the drive
and motor are properly tightened.
• Check the motor and drive capacity.
Encoder
Disconnected
• F1-02 is set to 0, 1, or 2 and no signal is
received from the encoder for longer than
the time set in F1-14.
• Check the encoder wiring and fix it if
needed.
• Check the encoder power supply.
• Check the command sequence. Check if
the brake fully opens before acceleration
starts.
• F1-02 is set to 3 and no signal is received
from the encoder for longer than the time
set in F1-14.
Braking
Transistor
Fault
• The internal braking transistor is broken or
the braking resistor is connected wrong.
• Make sure the braking resistor is con-
nected correctly.
• Cycle the power supply.
• Replace the drive if the fault reoccurs.
Motor
Contactor
Response
Error
• The motor contactor response was not
input within the time set in S1-10.
• Make sure the motor contactor really
closes.
• Check the setting of S1-10.
• Check the motor contactor feedback wir-
ing.
LED Display AL FLT
Possible Cause
Corrective Action
oL1
oL2
ov
oS
PF
PGo
rr
SE1
