Troubleshooting
7
7.4 Fault
YASKAWA SIEPC71061753C GA500 Technical Manual 275
Code Name Causes Possible Solutions
SEr Speed Search Retries Exceeded
The speed search-related parameters are set
incorrectly.
• Decrease b3-10 [Speed Estimation Detection Gain].
• Increase b3-17 [Speed Est Retry Current Level].
• Increase b3-18 [Speed Est Retry Detection Time].
• Do Auto-Tuning again.
The motor is coasting in the opposite direction of
the Run command.
Set b3-14 = 1 [Bi-directional Speed Search = Enabled].
Note:
• The drive detects this error if the number of speed search restarts is more than b3-19 [Speed Search Restart Attempts].
• Do a Fault Reset to clear the fault.
Code Name Causes Possible Solutions
STPo Motor Step-Out Detected
The motor code is set incorrectly for PM Control
Methods.
• Set E5-01 [PM Motor 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 [Motor to Load Inertia Ratio].
• Increase the value set in n8-51 [Pull-in Current @
Acceleration]. If the drive detects STPo during deceleration
when increasing the value set in n8-51, set the value of n8-79
[Pull-in Current @ 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 [S-Curve Time @ 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 [Torque Detection Level 1] and L6-03 [Torque
Detection Time 1] 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 [Torque Detection Selection 1].
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 [Torque Detection Level 2] and L6-06 [Torque
Detection Time 2] 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 [Torque Detection Selection 2].
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 [Mechanical Fatigue Detect Select].
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.
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