YASKAWA LA500 - Page 29

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YASKAWA TOMPYEULA5001C LA500 Installation and Operation Instructions 29
Code Name Causes Possible Solutions
oC Overcurrent
• The motor main circuit cable is
contacting ground to make a
short circuit.
• The load is too large.
• The acceleration time is too
short.
• The V/f pattern settings are
incorrect.
• The motor data is incorrect.
• A magnetic contactor was
switched at the output.
• Replace damaged output cables or motor
cables.
• Repair damaged devices.
• Make sure that the parameter settings are
correct.
• Make sure that the sequence of the
electromagnetic contactor on the drive
output side is correct.
oL1 Motor Overload
The motor load is too large. Decrease the motor load.
The drive is operating a general-
purpose motor with a high load at
lower speed than the rated speed.
Use a motor with an external cooling fan
and set the correct motor type to L1-01
[Motor Overload (oL1) Protection].
The acceleration/deceleration
times or cycle times are too short.
Increase the acceleration and deceleration
times.
The setting of the motor rated
current is incorrect.
Make sure that the rated current set in E2-01
[Motor Rated Current (FLA)] is correct.
oL2 Drive Overload
• The load is too large.
• The drive capacity is too small.
• The torque is too large at low
speed.
• Examine the load.
• Make sure that the drive is large enough
for the load.
• The overload capability of the drive
decreases at low speeds. Decrease the
load or replace the drive with a larger
capacity drive.
ov Overvoltage
• The power supply voltage is
too high.
• The deceleration time is too
short.
• The stall prevention function is
disabled.
• The braking resistor is not
connected or is broken.
• Motor control is not stable.
• The input voltage is too high.
• Increase the deceleration time.
• Set L3-04 ≠ 0 [Stall Prevention during
Decel ≠ Disabled] to enable stall
prevention.
• Replace the braking resistor.
• Make sure that the motor parameter
settings are correct, and adjust the torque
and slip compensation if necessary.
• Make sure that the supply voltage is
correct for the drive specifications.
PF Input Phase Loss
There is a phase loss in the drive
input power.
Correct all wiring errors with the main
circuit power supply.
Loose wiring in the input power
terminals.
Tighten the screws to the correct tightening
torque.
The drive input power voltage is
changing too much.
• Examine the supply voltage for
problems.
• Make the drive input power stable.
Unsatisfactory balance between
voltage phases.
• Examine the supply voltage for
problems.
• Make the drive input power stable.
• If the supply voltage is good, examine
the magnetic contactor on the main
circuit side for problems.