YASKAWA AC Drive-A1000 Technical Manual page 317

Communications wiring is faulty, there is a
short circuit, or something is not connected
properly.
Programming error on the master side.
Communications circuitry is damaged.
Termination resistor setting is incorrect.
Digital Operator Display
CE
Cause
A data error occurred due to noise.
Communication protocol is incompatible.
The CE detection time (H5-09) is set
shorter than the time required for a
communication cycle to take place.
Incompatible PLC software settings or
there is a hardware problem.
Communications cable is disconnected or
damaged.
Digital Operator Display
CrST
Cause
Fault reset was being executed when a Run
command was entered.
Digital Operator Display
dEv
Cause
Load is too heavy
Acceleration and deceleration times are set
too short.
The load is locked up.
Parameter settings are inappropriate.
Incorrect speed feedback scaling if terminal
RP is used as speed feedback input in V/f
Control.
The motor brake engaged.
Digital Operator Display
dnE
Cause
YASKAWA ELECTRIC SIEP C710616 31B YASKAWA AC Drive – A1000 Technical Manual
• Check for wiring errors.
• Correct the wiring.
• Check for disconnected cables and short circuits. Repair as needed.
Check communications at start-up and correct programming errors.
• 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.
A termination resistor must be installed at both ends of a communication line. Slave drives must have the
internal termination resistor switch set correctly. Place DIP switch S2 to the ON position.
MEMOBUS/Modbus Communication Error
Control data was not received correctly for two seconds.
• 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 comm. devices from drive input power lines. Install an EMC noise filter to the drive
input power supply.
• Check the H5 parameter settings as well as the protocol setting in the controller.
• Ensure settings are compatible.
• Check the PLC.
• Change the software settings in the PLC.
• Set a longer CE detection time (H5-09).
• Check the PLC.
• Remove the cause of the error on the controller side.
• Check the connector to make sure the cable has a signal.
• Replace the communications cable.
Cannot Reset
• Ensure that a Run command cannot be entered from the external terminals or option card during fault
reset.
• Turn off the Run command.
Speed Deviation (when using a PG option card)
The deviation between the speed reference and speed feedback is greater than the setting in F1-10 for longer
than the time in F1-11.
Reduce the load.
Increase the acceleration and deceleration times (C1-01 through C1-08).
Check the machine.
Check the settings of parameters F1-10 and F1-11.
• Set H6-02 to value of the speed feedback signal frequency when the motor runs at the maximum speed.
• Adjust the speed feedback signal using parameters H6-03 through H6-05.
• Make sure the speed feedback signal frequency does not exceed he maximum input frequency of terminal
RP.
Ensure the brake releases properly.
Drive Disabled
Minor Fault Name
Possible Solutions
Minor Fault Name
Possible Solutions
Minor Fault Name
Possible Solutions
Minor Fault Name
Possible Solutions
6.5 Alarm Detection
317
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