7.4 Faults
236 SIEPCYEUOQ2V01A Q2V Technical Manual
Code Name Causes Possible Solutions
STPo Motor Step-Out Detected
The motor code is set incorrectly for PM Control
Methods.
• Set E5-01 [PM Mot Code Selection] correctly as specified by
the motor.
• For specialized motors, refer to the motor test report and set
E5-xx correctly.
The load is too large. • Increase the value set in n8-55 [Load Inertia].
• Increase the value set in n8-51 [Ac/Dec Pull-In Current]. If the
drive detects STPo during deceleration when increasing the
value set in n8-51, set the value of n8-79 [Pull-In
Curr@Deceleration] lower than n8-51.
• Decrease the load.
• Replace the drive and motor with larger capacity models.
The load inertia is too large. Increase the value set in n8-55.
The acceleration/deceleration times are too short. • Increase the values set in C1-01 to C1-08 [Acceleration/
Deceleration Times].
• Increase the value set in C2-01 [Jerk@Start of Accel].
Speed response is too slow. Increase the value set in n8-55.
Note:
Do a Fault Reset to clear the fault.
Code Name Causes Possible Solutions
TiM Keypad Time Not Set
There is a battery in the keypad, but the date and
time are not set.
Use the keypad to set the date and time.
Note:
• Do a Fault Reset to clear the fault.
• Parameter o4-24 [bAT Detection Selection] enables and disables TiM detection.
Code Name Causes Possible Solutions
UL3 Undertorque Detection 1
A fault occurred on the machine.
Example: There is a broken pulley belt.
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 error if the drive output current is less 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 error, it will operate the motor as specified by the Stopping Method set in L6-01 [Trq Det1 Select].
Code Name Causes Possible Solutions
UL4 Undertorque Detection 2
A fault occurred on the machine.
Example: There is a broken pulley belt.
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 error if the drive output current is less 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 error, it will operate the motor as specified by the Stopping Method set in L6-04 [Trq Det2 Select].
Code Name Causes Possible Solutions
UL5 Mechanical Weakening Detection 2
The drive detected undertorque as specified by the
conditions for mechanical weakening detection set
in L6-08 [MechF Enable].
Examine the machine for deterioration.
Note:
• Do a Fault Reset to clear the fault.
• If the drive detects this error, it will operate the motor as specified by the Stopping Method set in L6-08.
Code Name Causes Possible Solutions
Uv1 DC Bus Undervoltage
There is a phase loss in the drive input power. Correct errors with the wiring for main circuit drive input power.
There is loose wiring in the drive input power
terminals.
Tighten the terminal screws to the correct tightening torque.
The drive input power voltage is changing too
much.
• Examine the input power for problems.
• Make the drive input power stable.
• If the input power supply is good, examine the magnetic
contactor on the main circuit side for problems.
There was a loss of power. Use a better power supply.
The main circuit capacitors have become
unserviceable.
Examine the capacitor maintenance time in monitor U4-05
[Capacitor Maintenance]. If U4-05 is more than 90%, replace the
control board or the drive. For information about replacing the
control board, contact the manufacturer or your nearest sales
representative.
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