7.4 Faults
266 SIEPYEUOQ2A01A AC Drive Q2A Technical Manual
Code Name Causes Possible Solutions
oL2 Drive Overload
The load is too heavy. Decrease the load.
The acceleration/deceleration times or cycle times
are too short.
• Examine the acceleration/deceleration times and the motor
start/stop frequencies (cycle times).
• Increase the value set in Acceleration/Deceleration Times C1-
01 to C1-08.
The V/f pattern does not fit the motor qualities. • Examine the ratios between the V/f pattern frequency and
voltage. Lower the voltage if it is too high compared to the
frequency.
• Adjust V/f Pattern Parameters E1-04 to E1-10. Lower the
values set in E1-08 [Mid A Voltage] and E1-10 [Min Output
Voltage] For motor 2, adjust E3-04 to E3-10.
Note:
If E1-08 and E1-10 are set too low, the overload tolerance is
will decrease at low speeds.
The drive capacity is too small. Replace the drive with a larger capacity model.
Overload occurred while running at low speed. • 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].
The torque compensation gain is too large. Decrease the value set in C4-01 [Trq Comp Gain] to make sure
that the motor does not stall.
The speed search-related parameters are set
incorrectly.
• Examine the settings for all speed search related parameters.
• Adjust b3-03 [SpSrch Deceleration Time].
• Set b3-24 = 1 [SpSrch Method Selection = Speed Estimation]
after Auto-Tuning.
Phase loss in the input power supply is causing the
output current to change.
• Correct any wiring errors in the main circuit drive input power.
• Make sure that there is no phase loss, and repair problems.
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 [OL1-4 Auto-Reset Select] disables the Auto Restart function.
Code Name Causes Possible Solutions
oL3 Overtorque Detection 1
A fault occurred on the machine.
Example: The machine is locked.
Examine the machine and remove the cause of the fault.
The parameters are incorrect for the load. Adjust L6-02 [Trq Det1 Level] and L6-03 [Trq Det1 Time]
settings.
Note:
• The drive detects this fault if the drive output current is more than the level set in L6-02 for longer than L6-03.
• Do a Fault Reset to clear the fault.
• If the drive detects this fault, it will operate the motor as specified by the Stopping Method set in L6-01 [Trq Det1 Select].
• L5-07 [OL1-4 Auto-Reset Select] disables the Auto Restart function.
Code Name Causes Possible Solutions
oL4 Overtorque Detection 2
A fault occurred on the machine.
Example: The machine is locked.
Examine the machine and remove the cause of the fault.
The parameters are incorrect for the load. Adjust L6-05 [Trq Det2 Level] and L6-06 [Trq Det2 Time]
settings.
Note:
• The drive detects this fault if the drive output current is more than the level set in L6-05 for longer than L6-06.
• Do a Fault Reset to clear the fault.
• If the drive detects this fault, it will operate the motor as specified by the Stopping Method set in L6-04 [Trq Det2 Select].
• L5-07 [OL1-4 Auto-Reset Select] disables the Auto Restart function.
Code Name Causes Possible Solutions
oL5 Mechanical Weakening Detection 1
The drive detected overtorque as specified by the
conditions for mechanical weakening detection set
in L6-08 [MechF Enable], and in L6-56, L6-57, L6-
58 [MechF Action, MechFAbsSpeed, MechF
Method].
Do a deterioration diagnostic test on the machine side.
Note:
• Do a Fault Reset to clear the fault.
• If the drive detects this fault, it will operate the motor as specified by the Stopping Method set in L6-08, and in L6-56, L6-57, L6-58 [MechFAction, MechF AbsSpeed, MechF
Method].
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