Yaskawa iQpump1000 AC Drive Quick Start - Manual (Page 262)

Communications circuitry is damaged.
• Perform a self-diagnostics check.
• If the problem continues, replace either the control board or the entire drive. For instructions on replacing
the control board, contact Yaskawa or your nearest sales representative.
Termination resistor setting is incorrect.
Install a termination resistor at both ends of a communication line. Set the internal termination resistor switch
correctly on slave drives. Place DIP switch S2 to the ON position.
HOA Keypad Display Minor Fault Name
CE
MEMOBUS/Modbus Communication Error
Control data was not received correctly for two seconds.
Cause Possible Solution
A data error occurred due to noise.
• Check options available to minimize the effects of noise.
• Take steps to counteract noise in the control circuit wiring, main circuit lines, and ground wiring.
• Reduce noise on the controller side.
• Use surge absorbers for the magnetic contactors or other components that may be causing the disturbance.
• Use only recommended shielded line. Ground the shield on the controller side or on the drive input power
side.
• Separate all wiring for communication devices from drive input power lines. Install an EMC noise filter
to the drive input power supply.
Communication protocol is incompatible.
• Check the H5 parameter settings and the protocol setting in the controller.
• Ensure settings are compatible.
The CE detection time (H5-09) is set
shorter than the time required for a
communication cycle to take place.
• Check the PLC.
• Change the software settings in the PLC.
• Set a longer CE detection time using parameter H5-09.
Incompatible PLC software settings or
there is a hardware problem.
• Check the PLC.
• Remove the cause of the error on the controller side.
Communications cable is disconnected or
damaged.
• Check the connector to make sure the cable has a signal.
• Replace the communications cable.
HOA Keypad Display Minor Fault Name
Current Limit
Foldback
Current Limit Foldback
Cause Possible Solution
Drive output speed is being limited due to
the output current limit.
• Reduce the load.
• Verify setting of Q3-02.
• Change to a larger drive size.
HOA Keypad Display Minor Fault Name
De-Scale/De-rag
Active
De-scale is running
Cause Possible Solution
De-scale is programmed and enough run-
time has been accumulated.
If De-scale/De-rag is not desired, program P8-01 = 0 (Disabled).
Adjust the De-scale Run Timer P8-08.
HOA Keypad Display Minor Fault Name
dnE Drive Disabled
Cause Possible Solution
“Drive Enable” is set to a multi-function
contact input (H1-oo = 6A) and the
contact is open.
Check the operation sequence.
HOA Keypad Display Minor Fault Name
EF
Forward/Reverse Run Command Input Error
Both forward run and reverse run closed simultaneously for longer than 0.5 s.
Cause Possible Solution
Sequence error
Check the forward and reverse command sequence and correct the problem.
Note: When minor fault EF detected, motor ramps to stop.
5.3 Alarm Detection
262 YASKAWA TOEP YAIP1W 01B YASKAWA AC Drive - iQpump1000 Quick Start Guide