6.5 Alarm Detection
320 YASKAWA ELECTRIC SIEP C710616 27C YASKAWA AC Drive A1000 Technical Manual
Digital Operator Display Minor Fault Name
CE
MEMOBUS/Modbus Communication Error
Control data was not received correctly for two seconds.
Cause Possible Solutions
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 comm. 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 as well as 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 (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.
Digital Operator Display Minor Fault Name
CrST
Cannot Reset
Cause Possible Solutions
A fault reset command was entered while the Run
command was still present.
• Ensure that a Run command cannot be entered from the external terminals or option card during fault reset.
• Turn off the Run command.
Digital Operator Display Minor Fault Name
dEv
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.
Cause Possible Solutions
Load is too heavy Reduce the load.
Acceleration and deceleration times are set too short. Increase the acceleration and deceleration times (C1-01 through C1-08).
The load is locked up. Check the machine.
Parameter settings are inappropriate. Check the settings of parameters F1-10 and F1-11.
Incorrect speed feedback scaling if terminal RP is
used as speed feedback input in V/f Control.
• 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.
The motor brake engaged. Ensure the brake releases properly.
Digital Operator Display Minor Fault Name
dnE Drive Disabled
Cause Possible Solutions
“Drive Enable” is set to a multi-function contact
input (H1- = 6A) and that signal was switched
off.
Check the operation sequence.
Digital Operator Display Minor Fault Name
EF
Forward/Reverse Run Command Input Error
Both forward run and reverse run closed simultaneously for over 0.5 s.
Cause Possible Solutions
Sequence error
Check the forward and reverse command sequence and correct the problem.
Note: When minor fault EF detected, motor ramps to stop.
Digital Operator Display Minor Fault Name
EF0
Option Card External Fault
An external fault condition is present.
Cause Possible Solutions
An external fault was received from the PLC with
F6-03 = 3 (causing the drive to continue running
when an external fault occurs).
• Remove the cause of the external fault.
• Remove the external fault input from the PLC.
There is a problem with the PLC program. Check the PLC program and correct problems.
Digital Operator Display Minor Fault Name
EF1
External fault (input terminal S1)
External fault at multi-function input terminal S1.
EF2
External fault (input terminal S2)
External fault at multi-function input terminal S2.
EF3
External fault (input terminal S3)
External fault at multi-function input terminal S3.
EF4
External fault (input terminal S4)
External fault at multi-function input terminal S4.
EF5
External fault (input terminal S5)
External fault at multi-function input terminal S5.
EF6
External fault (input terminal S6)
External fault at multi-function input terminal S6.
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