6.3 Fault Detection
u
Fault Displays, Causes, and Possible Solutions
Table 6.2 Detailed Fault Displays, Causes, and Possible Solutions
LED Display LCD Display Fault Name
AJF
AJF
Anti-Jam Fault
Anti-Jam Fault
Cause Possible Solution
The drive was not able to clear debris from
the impeller in fewer than the number of
attempts set in P7-02. This is only effective
when P7-01, Anti-jam Operation is set to 1
(enabled).
• Check for proper pump operation. Remove debris from the pump impeller.
• Adjust the P7-03 level or the P7-02 counts.
• Drive response to this condition is controlled by P7-01, Anti-jam Operation Selection.
LED Display LCD Display Fault Name
bv5
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.
LED Display LCD Display Fault Name
ce
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.
LED Display LCD Display Fault Name
cpf02
CPF02
A/D Conversion Error
An A/D conversion error or control circuit error occurred.
Cause Possible Solution
Control circuit is damaged
• Cycle power to the drive.
• If the problem continues, replace the drive.
6.3 Fault Detection
YASKAWA TOEP YAIQPM 03B YASKAWA AC Drive - iQpump Micro User Manual
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6
Troubleshooting
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