YASKAWA GA500 Maintenance & Troubleshooting page 53

Code Name
Note:
• The drive detects this fault if the electronic thermal protector of the drive started the motor overload protection.
• Do a Fault Reset to clear the fault.
• L5-07 [Fault Reset Enable Select Grp1] disables the Auto Restart function.
Code Name
oL2 Drive Overload
YASKAWA TOEPYAIGA5001A GA500 DRIVE MAINTENANCE & TROUBLESHOOTING
Causes
Overload occurred while running at low speed.
L1-01 [Motor Overload (oL1) Protection] is set
incorrectly.
The V/f pattern does not fit the motor qualities.
E1-06 [Base Frequency] is set incorrectly.
One drive is operating more than one motor.
The electronic thermal protector qualities and the
motor overload properties do not match.
The electronic thermal protector is operating at an
incorrect level.
There is increased motor loss from overexcitation
operation.
The speed search-related parameters are set
incorrectly.
Phase loss in the input power supply is causing the
output current to change.
The motor main circuit cable is too long.
Causes
The load is too large.
The acceleration/deceleration times or cycle times are
too short.
The V/f pattern does not fit the motor qualities.
The drive capacity is too small.
Overload occurred while running at low speed.
The torque compensation gain is too large.
Possible Solutions
• Decrease the load when running at low speed.
• Increase the motor speed.
• If the motor is run frequently at low speeds, replace the motor
with a larger motor or use a drive-dedicated motor.
Note:
For general-purpose motors, overload can occur while running
at low speed when operating at below the rated current.
Set L1-01 in as specified by the motor qualities for a drive-dedicated
motor.
• Examine the ratios between the V/f pattern frequency and
voltage. Decrease the voltage if it is too high compared to the
frequency.
• Adjust E1-04 to E1-10 [V/f Pattern Parameters]. For motor 2,
adjust E3-04 to E3-10. Decrease the values set in E1-08 [Mid
Point A Voltage] and E1-10 [Minimum Output Voltage].
Note:
If the values set in E1-08 and E1-10 are too low, the overload
tolerance will decrease at low speeds.
Set E1-06 to the rated frequency shown on the motor nameplate.
Set L1-01 = 0 [Motor Overload (oL1) Protection = Disabled],
connect thermal overload relay to each motor to prevent damage to
the motor.
• Examine the motor qualities and set L1-01 [Motor Overload
(oL1) Protection] correctly.
• Connect a thermal overload relay to the motor.
Set E2-01 [Motor Rated Current (FLA)] correctly to the value
specified by the motor nameplate.
• Lower the value set in n3-13 [OverexcitationBraking (OEB)
Gain].
• Set L3-04 ≠ 4 [Stall Prevention during Decel ≠ Overexcitation/
High Flux].
• Set n3-23 = 0 [Overexcitation Braking Operation = Disabled].
• Examine the settings for all speed search related parameters.
• Adjust b3-03 [Speed Search Deceleration Time].
• Set b3-24 = 1 [Speed Search Method Selection = Speed
Estimation] after Auto-Tuning.
Make sure that there is no phase loss, and repair problems.
• Replace the drive with a larger capacity model.
• Decrease C6-02 [Carrier Frequency]. Or set C6-02 = B.
Possible Solutions
Decrease the load.
• Examine the acceleration/deceleration times and the motor start/
stop frequencies (cycle times).
• Increase the values set in C1-01 to C1-08 [Acceleration/
Deceleration Times].
• Examine the ratios between the V/f pattern frequency and
voltage. Decrease the voltage if it is too high compared to the
frequency.
• Adjust E1-04 to E1-10 [V/f Pattern Parameters]. Decrease the
values set in E1-08 [Mid Point A Voltage] and E1-10 [Minimum
Output Voltage]. For motor 2, adjust E3-04 to E3-10.
Note:
If the values set in E1-08 and E1-10 are too low, the overload
tolerance will decrease at low speeds.
Replace the drive with a larger capacity model.
• Decrease the load when running at low speed.
• Replace the drive with a larger capacity model.
• Decrease the value set in C6-02 [Carrier Frequency Selection].
Decrease the value set in C4-01 [Torque Compensation Gain] to
make sure that the motor does not stall.
2.4 Fault
2
53