Troubleshooting
6
6.4 Faults
YASKAWA ELECTRIC SIEP C710617 05F YASKAWA AC Drive GA700 Technical Manual 359
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.
Set the date and time with the keypad.
Note:
• Do a Fault Reset to clear the fault.
• 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.
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 [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.
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