YASKAWA HV600 Installation & Startup page 128

5.5 Faults
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
UL6 Underload or Belt Break Detected
Note:
Do a Fault Reset to clear the fault.
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 208/240 V bypasses. The detection level is approximately 380 V for 480 V bypasses. 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.
128
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 output current decreased less than the motor
underload curve set in L6-14 [Motor Underload Level
@ Min Freq] for longer than the time set in L6-03
[Torque Detection Time 1].
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.
YASKAWA TOEPYAIH6B01A HV600 AC Drive Narrow Bypass Installation & Startup
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
Adjust the L6-14 setting to set the output current to stay the level
more than the motor underload curve during usual operations.
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.