286 YASKAWA ELECTRIC SIEP C710616 38F YASKAWA AC Drive - L1000A Technical Manual
6.3 Fault Detection
6.3 Fault Detection
◆ Fault Displays, Causes, and Possible Solutions
Faults are detected for drive protection, and cause the drive to stop while triggering the fault output terminal
MA-MB-MC. Remove the cause of the fault and manually clear the fault before attempting to run the drive again.
Table 6.8 Detailed Fault Displays, Causes, and Possible Solutions
Digital Operator Display Fault Name
boL
Braking Transistor Overload
The braking transistor has reached its overload level.
Cause Possible Solution
The wrong braking resistor is installed. Make sure the rating of the braking resistor fits drive and application. Use an external braking transistor if necessary.
Digital Operator Display Fault Name
bUS
Option Communication Error
• The connection was lost after establishing initial communication.
• Only detected when the Up/Down command speed reference is assigned to an option card.
Cause Possible Solution
No signal was received from the PLC.
• Check for faulty wiring.
• Correct the wiring.
• Check for disconnected cables and short circuits and repair as needed.
Faulty communications wiring or an existing short
circuit.
A communications data error occurred due to noise.
• Check the various options available to minimize the effects of noise.
• 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 absorbers 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.
The option card is damaged. Replace the option card if there are no problems with the wiring and the error continues to occur.
The option card is not properly connected to the drive.
• The connector pins on the option card do not line up properly with the connector pins on the drive.
• Reinstall the option card.
Digital Operator Display Fault Name
CE
MEMOBUS/Modbus Communication Error
Communication data was not received for the amount of time set in parameter, H5-09 Communication Fault Detection Time.
Cause Possible Solution
Faulty communications wiring or an existing short
circuit.
• Check for faulty wiring.
• Correct the wiring.
• Check for disconnected cables and short circuits and repair as needed.
Communication data error occurred due to noise.
• Check the various options available to minimize the effects of noise.
• 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. Use surge absorbers if required.
• Separate all communication wiring from drive power lines. Install an EMC noise filter to the drive power supply input.
Digital Operator Display Fault Name
CF
Control Fault
The torque limit was reached continuously for three seconds or longer while ramping to stop in OLV Control.
Cause Possible Solution
Motor parameters are improperly set. Check the motor parameter settings and repeat Auto-Tuning.
Torque limit is too low. Set the torque limit to the most appropriate setting (L7-01 through L7-04).
Load inertia is too big.
• Adjust the deceleration ramp (C1-02, -04, -06, -08).
• Set the speed reference to the minimum value and interrupt the Up/Down command when the drive finishes decelerating.
Digital Operator Display Fault Name
CoF
Current Offset Fault
The current sensor is damaged or there was residual induction current in the motor (e.g., during sudden deceleration or when
coasting) when the drive attempted to start the motor.
Cause Possible Solution
Due to residual induction current in the motor when the
drive attempted to start the motor, the drive attempted to
adjust the current offset value beyond the allowable
range.
• Create a motor restart sequence that allows enough time for the residual induction voltage to dissipate.
• Enable Speed Search at start (b3-01 = 1). Use the multi-function terminals to execute External Speed Search 1 and 2 (H1- =
61 or 62).
Note: When using a PM motor, both External Speed Search 1 and 2 perform the same operation.
Hardware is damaged. Replace the drive. Replace the drive.
Digital Operator Display Fault Name
or
<1>
CPF00 or CPF01 Control Circuit Error
Cause Possible Solution
There is a self diagnostic error in control circuit.
• Cycle power to the drive.
• Set the frequency to the minimum value and interrupt the Run command when the drive finishes decelerating.
Connector on the operator is damaged. Replace the operator.
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