Yaskawa L1000E AC Drive Technical Manual for CIMR-LE Models for Elevator Applications - Manual (Page 287)

6.3 Fault Detection
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The motor contactor opened. Check the contactor for any problems.
Digital Operator Display Fault Name
SE4
Brake Feedback Error
The input terminal set for “Brake feedback” (H1-†† = 79) or “Brake feedback 2” (H2-†† = 5B) did not respond within the
SE4 error time set to S6-05 after an output terminal set for “Brake release” (H2-†† = 50) closed.
Cause Possible Solution
The feedback contact on the brake is broken or the
wiring is incorrect.
Check the brake feedback contact and the wiring.
The brake control circuit does not work properly. Ensure the motor brake operates properly with a brake control command from the drive.
Digital Operator Display Fault Name
SvE
Position Lock Error
Position deviation during Position Lock.
Cause Possible Solution
Torque limit is set too low. Set the torque limit to an appropriate value using parameters L7-01 to L7-04.
Excessive load torque. Reduce the amount of load torque.
Noise interference along encoder wiring. Check the encoder signal for noise interference.
Digital Operator Display Fault Name
UL3
Undertorque Detection 1
The current has fallen below the minimum value set for torque detection (L6-02) for longer than the allowable time (L6-03).
Cause Possible Solution
Parameter settings are not appropriate for the load. Check the settings of parameters L6-02 and L6-03.
There is a fault on the machine side. Check the load for any problems.
Digital Operator Display Fault Name
UL4
Undertorque Detection 2
The current has fallen below the minimum value set for torque detection (L6-05) for longer than the allowable time (L6-06).
Cause Possible Solution
Parameter settings are not appropriate for the load. Check the settings of parameters L6-05 and L6-06.
There is a fault on the machine side. Check the load for any problems.
Digital Operator Display Fault Name
Uv1
DC Bus Undervoltage
One of the following conditions occurred while the drive was running:
• 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)
Cause Possible Solution
Input power phase loss.
• The main circuit drive input power is wired incorrectly.
• Correct the wiring.
One of the drive input power wiring terminals is loose.
• Ensure there are no loose terminals.
• Apply the tightening torque specified in this manual to fasten the terminals.
Refer to Wire Gauges and Tightening Torque on
page 64 .
There is a problem with the voltage from the drive input
power.
• 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.
The power has been interrupted. Correct the drive input power.
The main circuit capacitors are worn.
• 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.
The relay or contactor on the soft-charge bypass circuit
is damaged.
• 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.
Digital Operator Display Fault Name
Uv2
Control Power Supply Voltage Fault
Voltage is too low for the control drive input power.
Cause Possible Solution
Control power supply wiring is damaged.
• 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.
Internal circuitry is damaged.
• 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.
Digital Operator Display Fault Name
Uv3
Soft-Charge Bypass Circuit Fault
The soft-charge bypass circuit failed.
Cause Possible Solution