YASKAWA GA500 Maintenance & Troubleshooting page 58

2.4 Fault
Code Name
STPo Motor Step-Out Detected
Note:
Do a Fault Reset to clear the fault.
Code Name
TiM Keypad Time Not Set
Note:
• Do a Fault Reset to clear the fault.
• Parameter o4-24 [bAT Detection Selection] enables and disables TiM detection.
Code Name
UL3 Undertorque Detection 1
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
UL4 Undertorque Detection 2
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
UL5 Mechanical Weakening Detection 2
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
Uv1 DC Bus Undervoltage
58
Causes
The motor code is set incorrectly for PM Control
Methods.
The load is too large.
The load inertia is too large.
The acceleration/deceleration times are too short.
Speed response is too slow.
Causes
There is a battery in the keypad, but the date and time
are not set.
Causes
A fault occurred on the machine.
Example: There is a broken pulley belt.
The parameters are incorrect for the load.
Causes
A fault occurred on the machine.
Example: There is a broken pulley belt.
The parameters are incorrect for the load.
Causes
The drive detected undertorque as specified by the
conditions for mechanical weakening detection set in
L6-08 [Mechanical Fatigue Detect Select].
Causes
There is a phase loss in the drive input power.
There is loose wiring in the drive input power
terminals.
The drive input power voltage is changing too much.
There was a loss of power.
The main circuit capacitors have become
unserviceable.
YASKAWA TOEPYAIGA5001A GA500 DRIVE MAINTENANCE & TROUBLESHOOTING
Possible Solutions
• 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.
• 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.
Increase the value set in n8-55.
• 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].
Increase the value set in n8-55.
Possible Solutions
Use the keypad to set the date and time.
Possible Solutions
Examine the machine and remove the cause of the fault.
Adjust L6-02 [Torque Detection Level 1] and L6-03 [Torque
Detection Time 1] settings.
Possible Solutions
Examine the machine and remove the cause of the fault.
Adjust L6-05 [Torque Detection Level 2] and L6-06 [Torque
Detection Time 2] settings.
Possible Solutions
Examine the machine for deterioration.
Possible Solutions
Correct errors with the wiring for main circuit drive input power.
Tighten the terminal screws to the correct tightening torque.
• 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.
Use a better power supply.
Examine the capacitor maintenance time in monitor U4-05
[CapacitorMaintenance]. If U4-05 is more than 90%, replace the
control board or the drive. For information about replacing the
control board, contact Yaskawa or your nearest sales representative.