Fault Detection - YASKAWA U1000 Series Technical Manual

6.4 Fault Detection

6.4 Fault Detection
 Fault Displays, Causes, and Possible Solutions
Faults are detected for drive protection that cause the drive to stop while toggling the form-C output associated with
terminals MA-MB-MC.
Remove the cause of the fault and manually clear the fault before attempting to run the drive again.
Table 6.15 Detailed Fault Displays, Causes, and Possible Solutions
Digital Operator Display
Cause
• The power supply voltage exceeded the range listed in
drive input power specifications.
• Regenerative operation was performed when the
power supply capacity was too small.
• The power supply circuit opened during regeneration.
Digital Operator Display
Cause
The capacity of the power supply is too small.
The distortion in the power supply is too large.
A phase loss occurred in the input power supply.
The built-in fuse is open.
Digital Operator Display
Cause
No signal received from the PLC.
Faulty communications wiring or a short circuit exists.
A communications data error occurred due to noise.
The option card is damaged.
The option card is not properly connected to the drive.
Digital Operator Display
Cause
Faulty communications wiring or a short circuit exists.
Communication data error occurred due to noise.
Digital Operator Display
Cause
Motor parameters are not set properly.
Torque limit is too low.
Load inertia is too big.
312
Power Supply Overvoltage
The input power supply voltage became equal to or higher than the Input Power Supply Overvoltage Detection Level.
Aov
200 V Class: Approximately 277 Vrms
400 V Class: Approximately 630 Vrms
• Reduce the voltage to within the range in the power supply specifications.
• Increase the capacity of the power supply.
Power Supply Undervoltage
The input power supply voltage became equal to or lower than the Input Power Supply Undervoltage Detection Level (L2-21).
AUv
200 V Class: Approximately 150 Vrms
400 V Class: Approximately 300 Vrms
Increase the capacity of the power supply.
Lower the impedance of the input power supply wiring.
Check the input power supply for phase loss or an imbalance in the interphase voltages. Investigate and correct the cause and then
reset the fault.
An internal transistor was destroyed.
The input wiring is grounded or short-circuited.
The output transistor has failed because the drive output has grounded or short-circuited.
Replace the board or the drive. For instructions on replacing the control board, contact Yaskawa or your nearest sales
representative.
Option Communication Error
bUS
• After establishing initial communication, the connection was lost.
• Only detected when the run command frequency reference is assigned to an option card.
• Check for faulty wiring.
• Correct the wiring.
• Check for disconnected cables and short circuits. Repair as needed.
• Check the various options available to minimize the effects of noise.
• Take steps to counteract noise in the control circuit, main circuit, and ground wiring.
• Ensure that other equipment such as switches or relays do not cause noise. Use surge suppressors if necessary.
• Use only recommended cables or other shielded line. Ground the shield on the controller side or on the drive input power side.
• Separate all communication wiring from drive power lines. Install an EMC noise filter to the drive power supply input.
• Replace the option card if there are no problems with the wiring and the error continues to occur.
• The connector pins on the option card are not properly lined up with the connector pins on the drive.
• Reinstall the option card.
MEMOBUS/Modbus Communication Error
CE
Control data was not received for the CE detection time set to H5-09.
• Check for faulty wiring.
• Correct the wiring.
• Check for disconnected cables and short circuits. Repair as needed.
• Check the various options available to minimize the effects of noise.
• Take steps to counteract noise in the control circuit, main circuit, and ground wiring.
• Use only recommended cables or other shielded line. Ground the shield on the controller side or on the drive input power side.
• Ensure that other equipment such as switches or relays do not cause noise and use surge suppressors if required.
• Separate all communication wiring from drive power lines. Install an EMC noise filter to the drive power supply input.
Control Fault
CF
The torque limit was reached continuously for 3 seconds after the Stop command was input and deceleration was not possible in
Open Loop Vector Control.
Check the motor parameter settings and repeat Auto-Tuning.
Set the torque limit to the most appropriate setting (L7-01 through L7-04).
• Adjust the deceleration time (C1-02, C1-04, C1-06, C1-08).
• Set the frequency to the minimum value and interrupt the Run command when the drive finishes decelerating.
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
YASKAWA ELECTRIC SIEP C710636 03A YASKAWA U1000 Technical Manual