Fault Detection - YASKAWA L1000A Technical Manual

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
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
CPF00 or CPF01
or
<1>
Cause
There is a self diagnostic error in control circuit.
Connector on the operator is damaged.
Digital Operator Display
CPF02
Cause
Control circuit is damaged.
YASKAWA ELECTRIC SIEP C710616 38A YASKAWA AC Drive L1000A Technical Manual
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
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 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.
Control Circuit Error
<1>
• 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.
A/D Conversion Error
An A/D conversion error or control circuit error occurred.
• Cycle power to the drive.
• If the problem continues, replace the control board or the entire drive. Contact Yaskawa or a Yaskawa representative for
instructions on replacing the control board.
6.3 Fault Detection
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
Fault Name
Possible Solution
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