YASKAWA GA800 Technical Reference page 388

7.4 Fault
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
Note:
• The drive detects this error if the DC bus voltage decreases below the level set in L2-05 [Undervoltage Detection Lvl (Uv1)] while the drive is running.
• The Uv1 detection level is approximately 190 V for a 200 V class drives. The detection level is approximately 380 V for 400 V class drives. The detection level is approximately
350 V when E1-01 [Input AC Supply Voltage] < 400.
• Do a Fault Reset to clear the fault.
• Fault trace is not available for this fault.
• L5-08 [Fault Reset Enable Select Grp2] disables the Auto Restart function.
Code Name
Uv2 Control Power Undervoltage
Note:
• The drive detects this error if the control power supply voltage decreases.
• Do a Fault Reset to clear the fault.
• Fault trace is not available for this fault.
388
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.
The relay or contactor on the soft-charge bypass relay
is damaged.
Causes
The value set in L2-02 [Power Loss Ride Through
Time] increased and the momentary power loss
recovery unit is not connected to the drive.
There was a problem with the drive hardware.
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.
U4-06 [PreChargeRelayMainte] shows the performance life of the
soft-charge bypass relay. If U4-06 is more than 90%, replace the
board or the drive. For information about replacing the board,
contact Yaskawa or your nearest sales representative.
Possible Solutions
Connect the momentary power loss recovery unit to the drive.
• Re-energize the drive.
• If the fault stays, replace the control board or the drive. For
information about replacing the control board, contact Yaskawa
or your nearest sales representative.
YASKAWA SIEPC71061737D GA800 Drive Technical Reference