5.2 Fault Detection
u
Fault Displays, Causes, and Possible Solutions
Faults are detected for drive protection, and 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 5.2 Detailed Fault Displays, Causes, and Possible Solutions
Digital Operator Display Fault Name
boL
Braking Transistor Overload Fault
The braking transistor reached its overload level.
Digital Operator Display Fault Name
bUS
Option Communication Error
• The connection was lost after establishing initial communication.
•
Only detected when the run command frequency 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
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.
• 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 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
Control data was not received for the CE detection time set to H5-09.
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 the
drive input power side.
• Ensure that other equipment such as switches or relays do not cause noise. Use surge suppressors 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 after the Stop command was input and
deceleration was not possible in OLV Control.
Digital Operator Display Fault Name
CoF
Current Offset Fault
Drive starts operation while the current-detection circuit failure, or the induced voltage remains in the
motor (coasting and after rapid deceleration).
5.2 Fault Detection
YASKAWA ELECTRIC TOEP C710616 41G YASKAWA AC Drive - A1000 Quick Start Guide
179
5
Troubleshooting
To Next Page
Loading...
Need help?
General
