YASKAWA GA800 Technical Reference page 400

7.5 Minor Faults/Alarms
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.
• If the drive detects this error, the terminal assigned to H2-01 to H2-03 = 10 [MFDO Function Select = Alarm] will be ON.
• 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.
• If detected, the terminal assigned to H2-01 to H2-03 = 10 [MFDO Function Select = Alarm] will be ON.
• 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:
• If the drive detects this error, the terminal assigned to H2-01 to H2-03 = 10 [MFDO Function Select = Alarm] will be ON.
• If the drive detects this error, it will operate the motor as specified by the Stopping Method set in L6-08.
Code Name
Uv Undervoltage
Note:
• The drive detects this error if one of these conditions is correct when the Run command has not been input (while the drive is stopped).
–The DC bus voltage < L2-05 [Undervoltage Detection Lvl (Uv1)].
–The Contactor that prevents inrush current in the drive was opened.
–There is low voltage in the control drive input power.
• If the drive detects this error, the terminal assigned to H2-01 to H2-03 = 10 [MFDO Function Select = Alarm] will be ON.
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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
The drive input power voltage is changing too much.
There is a phase loss in the drive input power.
There is loose wiring in the drive input power
terminals.
There was a loss of power.
The main circuit capacitors have become
unserviceable.
The drive input power transformer is too small and
voltage drops when the power is switched on.
Air inside the drive is too hot.
The Charge LED is broken.
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
• 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.
Correct errors with the wiring for main circuit drive input power.
Tighten the terminal screws to the correct tightening torque.
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.
• Check for an alarm when a molded-case circuit breaker, Leakage
Breaker (ELCB, GFCI, or RCM/RCD) (with overcurrent
protective function), or magnetic contactor is ON.
• Check the capacity of the drive power supply transformer.
Check the ambient temperature of the drive.
Replace the control board or the entire drive. For information about
replacing the control board, contact Yaskawa or your nearest sales
representative.
YASKAWA SIEPC71061737D GA800 Drive Technical Reference