YASKAWA L1000A Technical Manual page 267

Digital Operator Display
Cause
The feedback contact on the brake is broken or the
wiring is incorrect.
The brake control circuit does not work properly.
Digital Operator Display
Cause
Torque limit is set too low.
Excessive load torque.
Noise interference along encoder wiring.
Digital Operator Display
Cause
Parameter settings are not appropriate for the load.
There is a fault on the machine side.
Digital Operator Display
Cause
Parameter settings are not appropriate for the load.
There is a fault on the machine side.
Digital Operator Display
Cause
Input power phase loss.
One of the drive input power wiring terminals is loose.
There is a problem with the voltage from the drive input
power.
The power has been interrupted.
The main circuit capacitors are worn.
The relay or contactor on the soft-charge bypass circuit
is damaged.
Digital Operator Display
Cause
Control power supply wiring is damaged.
Internal circuitry is damaged.
YASKAWA ELECTRIC SIEP C710616 38A YASKAWA AC Drive L1000A Technical Manual
Brake Feedback Error
SE4
The input terminal set for "Brake feedback" (H1-
terminal set for "Brake release" (H2-
Check the brake feedback contact and the wiring.
Ensure the motor brake operates properly with a brake control command from the drive.
Position Lock Error
SvE
Position deviation during Position Lock.
Set the torque limit to an appropriate value using parameters L7-01 to L7-04.
Reduce the amount of load torque.
Check the encoder signal for noise interference.
Undertorque Detection 1
UL3
The current has fallen below the minimum value set for torque detection (L6-02) for longer than the allowable time (L6-03).
Check the settings of parameters L6-02 and L6-03.
Check the load for any problems.
Undertorque Detection 2
UL4
The current has fallen below the minimum value set for torque detection (L6-05) for longer than the allowable time (L6-06).
Check the settings of parameters L6-05 and L6-06.
Check the load for any problems.
DC Bus Undervoltage
One of the following conditions occurred while the drive was stopped:
Uv1
• Voltage in the DC bus fell below the undervoltage detection level (L2-05)
• For 200 V class: approximately 190 V
• For 400 V class: approximately 380 V (350 V when E1-01 is less than 400)
• The main circuit drive input power is wired incorrectly.
• Correct the wiring.
• Ensure there are no loose terminals.
• Apply the tightening torque specified in this manual to fasten the terminals.
page 62
• Check the voltage.
• Correct the voltage to be within the range listed in drive input power specifications.
• If there is no problem with the power supply to the main circuit, check for problems with the main circuit magnetic contactor.
Correct the drive input power.
• Check the maintenance time for the capacitors (U4-05).
• Replace either the control board or the entire drive if U4-05 exceeds 90%. For instructions on replacing the control board,
contact Yaskawa or a Yaskawa representative.
• Cycle power to the drive and see if the fault reoccurs.
• If the problem continues, replace either the control board or the entire drive. For instructions on replacing the control board,
contact Yaskawa or a Yaskawa representative.
• Check monitor U4-06 for the performance life of the soft-charge bypass.
• Replace either the control board or the entire drive if U4-06 exceeds 90%. For instructions on replacing the control board,
contact Yaskawa or a Yaskawa representative.
Control Power Supply Voltage Fault
Uv2
Voltage is too low for the control drive input power.
• Cycle power to the drive. Check if the fault reoccurs.
• If the problem continues, replace the control board, the entire drive, or the control power supply. For instructions on replacing
the control board, contact Yaskawa or a Yaskawa representative.
• Cycle power to the drive. Check if the fault reoccurs.
• If the problem continues, replace either the control board or the entire drive. For instructions on replacing the control board,
contact Yaskawa or a Yaskawa representative.
Fault Name
= 79) did not respond within the SE4 error time set to S6-05 after an output
= 50) closed.
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
Refer to Wire Gauges and Tightening Torque on
Fault Name
Possible Solution
6.3 Fault Detection
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