Fault Detection - YASKAWA 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.
Digital Operator Display
Cause
The wrong braking resistor is installed.
Digital Operator Display
Cause
No signal was received from the PLC.
Faulty communications wiring or an existing short
circuit.
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 an existing short
circuit.
Communication data error occurred due to noise.
Digital Operator Display
Cause
Motor parameters are improperly set.
Torque limit is too low.
Load inertia is too big.
Digital Operator Display
Cause
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.
Hardware is damaged. Replace the drive.
Digital Operator Display
or
CPF00 or CPF01
<1>
Cause
There is a self diagnostic error in control circuit.
Connector on the operator is damaged.
286
Table 6.8 Detailed Fault Displays, Causes, and Possible Solutions
Braking Transistor Overload
boL
The braking transistor has reached its overload level.
Make sure the rating of the braking resistor fits drive and application. Use an external braking transistor if necessary.
Option Communication Error
bUS
• The connection was lost after establishing initial communication.
• Only detected when the Up/Down command speed reference is assigned to an option card.
• Check for faulty wiring.
• Correct the wiring.
• Check for disconnected cables and short circuits and repair as needed.
• 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.
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 do not line up properly with the connector pins on the drive.
• Reinstall the option card.
MEMOBUS/Modbus Communication Error
CE
Communication data was not received for the amount of time set in parameter, H5-09 Communication Fault Detection Time.
• Check for faulty wiring.
• Correct the wiring.
• Check for disconnected cables and short circuits and repair as needed.
• 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.
Control Fault
CF
The torque limit was reached continuously for three seconds or longer while ramping to stop in OLV 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 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.
Current Offset Fault
CoF
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.
• 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.
Replace the drive.
Control Circuit Error
• Cycle power to the drive.
• Set the frequency to the minimum value and interrupt the Run command when the drive finishes decelerating.
Replace the operator.
Fault Name
Possible Solution
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Possible Solution
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Possible Solution
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Possible Solution
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Possible Solution
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Possible Solution
YASKAWA ELECTRIC SIEP C710616 38F YASKAWA AC Drive - L1000A Technical Manual