YASKAWA GA700 Technical Manual page 289

Code Name
Note:
• Detected if the electronic thermal protector of the drive triggered the drive overload protection.
• Perform Fault Reset to clear the fault.
Code Name
oL3 Overtorque Detection 1
Note:
• Detected if the drive output current has exceeded the level set in L6-02 [Torque Detection Level 1] for longer than L6-03 [Torque
Detection Time 1].
• Perform Fault Reset to clear the fault.
• If detected, the drive will operate the motor according to the stop method set in L6-01 [Torque Detection Selection 1].
Code Name
oL4 Overtorque Detection 2
Note:
• Detected if the drive output current has exceeded the level set in L6-05 [Torque Detection Level 2] for longer than L6-06 [Torque
Detection Time 2].
• Perform Fault Reset to clear the fault.
• If detected, the drive will operate the motor according to the stop method set in L6-04 [Torque Detection Selection 2].
Code Name
oL5 Mechanical Weakening
Detection 1
Note:
• Perform Fault Reset to clear the fault.
• If detected, the drive will operate the motor according to the stop method set in L6-08 [Mechanical Weakening Detect Ope].
YASKAWA ELECTRIC SIEP C710617 01B YASKAWA AC Drive GA700 Technical Manual
Cause
The V/f pattern does not fit the motor
characteristics.
The drive capacity is too small.
Overload occurred while running at low
speed.
Torque compensation gain is too large.
The speed search-related parameters are
set incorrectly.
The output current is fluctuating due to
input power supply phase loss.
Cause
A fault occurred on the machine side.
Example: The machine is locked.
The parameters for load are not
appropriate.
Cause
A fault occurred on the machine side.
Example: The machine is locked.
The parameters for load are not
appropriate.
Cause
Overtorque was detected based on the
conditions for mechanical weakening
detection set in L6-08 [Mechanical
Weakening Detect Ope].
Possible Solution
• Check the ratios between the V/f pattern
frequency and voltage. Lower the voltage if it is
too high relative to the frequency.
• Adjust E1-04 to E1-10 [V/f Pattern Parameters].
For motor 2, adjust E3-04 to E3-10. In particular,
reduce the values set in E1-08 [Mid Point A
Voltage] and E1-10 [Minimum Output Voltage].
Note:
If E1-08 and E1-10 are reduced too much, the
overload tolerance is reduced at low speeds.
Replace the drive with a larger capacity model.
• Lower the load when running at low speed.
• Replace the drive with a larger capacity model.
• Lower the value set in C6-02 [Carrier
Frequency Selection].
Lower the value set in C4-01 [Torque
Compensation Gain] enough that the motor does
not stall.
• Check 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.
• Correct any wiring errors in the main circuit
drive input power.
• Check whether or not there is input phase loss,
and remedy any phase loss.
Possible Solution
Check the condition of the machine and remove the
cause of the fault.
Adjust L6-02 and L6-03.
Possible Solution
Check the condition of the machine and remove the
cause of the fault.
Adjust L6-05 and L6-06.
Possible Solution
Perform deterioration diagnostics on the machine
side.
6.4 Fault
6
289