YASKAWA L1000A Quick Start Manual page 44

8 Troubleshooting
Digital Operator AL FLT
Motor Overload

(oL1)
Drive Overload

(oL2)
DC Bus
Overvoltage
 
(ov)

Over Speed
(oS)

Input Phase Loss

(PF)
Encoder

Disconnected
(for Control Mode
with Encoder)

(PGo)
Braking Resistor
Fault

(rF)
Internal Braking
Transistor Fault

(rr)
Motor Switch
during Run

(rUn)
IGBT Short
Circuit

(SC)
Safety Circuit
Fault

(SCF)
Motor Contactor
Response Error

(SE1)
Starting Current
Error

(SE2)
EN 44
Possible Cause
• The motor load is too heavy.
• Acceleration and deceleration cycle times are too
short.
• Value set for the motor rated current is incorrect.
• The load is too heavy.
• The drive is too small.
• Too much torque at low speed.
• 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.
F1-03 is set to 0, 1, or 2 and the motor speed exceeded
the value of F1-08 for longer than the time set in 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 voltage drop or phase imbalance.
• One of the input phases is lost.
• Drive input wire are loose.
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.
F1-02 is set to 3 and no signal is received from the
encoder for longer than the time set in F1-14.
• The proper braking resistor option has not been
installed.
• Regenerative converter, regenerative unit, or braking
unit is being used.
The internal braking transistor is defective or the
braking resistor is connected wrong.
A motor switch command was entered during run.
• The motor has been damaged due to overheating or
the motor insulation is damaged.
• One of the motor cables has shorted out or there is a
grounding problem.
• The drive is damaged.
The safety circuit is damaged.
The motor contactor response was not input within the
time set in S1-10.
The output current was lower than 25% of the motor
no-load current at start.
• Check the elevator mechanics.
• 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.
• 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 and adjust the speed control loop settings (C5-
).
• If an external speed reference signal (analog, etc.) is
used make sure the signal is ok.
• Check the settings of F1-08 and F1-09.
• 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 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.
• Select the braking resistor option so that fits to the
drives braking transistor specification.
• Disable the braking transistor protection selection (set
L8-55 to 1).
• Make sure the braking resistor is connected correctly.
• Cycle the power supply.
• Replace the drive if the fault reoccurs.
Change the operation pattern so that the motor switch
command is entered while the drive is stopped.
• Check the insulation resistance.
• Check the wiring to the motor. Turn the power supply
off and then on again to check operation.
• Check the drive output side short circuit for broken
output transistor.
B1 and U/V/W

– (negative) and U/V/W

Contact your YASKAWA representative or nearest
YASKAWA sales office.
If the problem continues, replace the control board or
the entire drive. Contact YASKAWA or a YASKAWA
representative for instructions on replacing the control
board.
• Make sure the motor contactor really closes.
• Check the setting of S1-10.
• Check the motor contactor feedback wiring.
• Check the motor wiring.
• Check the motor contactor and the contactor
sequence. Make sure it closes properly during start.
YASKAWA ELECTRIC TOEP C710616 33G AC Drive L1000A - Quick Start Guide
Corrective Action