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Code
Name
oC
Overcurrent
oL1
Motor Overload
oL2
Drive Overload
ov
Overvoltage
PF
Input Phase Loss
YASKAWA TOMPYEULA5001C LA500 Installation and Operation Instructions
Causes
• 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.
The motor load is too large.
The drive is operating a general-
purpose motor with a high load at
lower speed than the rated speed.
The acceleration/deceleration
times or cycle times are too short.
The setting of the motor rated
current is incorrect.
• The load is too large.
• The drive capacity is too small.
• The torque is too large at low
speed.
• 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.
There is a phase loss in the drive
input power.
Loose wiring in the input power
terminals.
The drive input power voltage is
changing too much.
Unsatisfactory balance between
voltage phases.
Possible Solutions
• 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.
Decrease the motor load.
Use a motor with an external cooling fan
and set the correct motor type to L1-01
[Motor Overload (oL1) Protection].
Increase the acceleration and deceleration
times.
Make sure that the rated current set in E2-01
[Motor Rated Current (FLA)] is correct.
• 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.
• 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.
Correct all wiring errors with the main
circuit power supply.
Tighten the screws to the correct tightening
torque.
• Examine the supply voltage for
problems.
• Make the drive input power stable.
• 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.
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