Mitsubishi Electric FR-V520-1.5K to 55K Instruction Manual page 80

Operation Panel
E.OS
Indication
Name
Overspeed occurrence
Description
Indicates that the motor speed has exceeded the overspeed setting level.
• Check that the Pr. 374 "overspeed detection level" value is correct.
Check point
• Check that the number of PLG pulses differ from the actual number of PLG pulses.
• Set the Pr. 374 "overspeed detection level" value correctly.
Corrective action
• Set the correct number of PLG pulses in Pr. 851.
Operation Panel
E.OSD
Indication
Name Speed deviation excess detection
Stops the inverter output if the motor speed is increased or decreased under the influence of the
Description
load etc. during vector control and cannot be controlled in accordance with the speed command
value.
• Check that the Pr. 870 "speed deviation level" and Pr. 871 "speed deviation time" values are
correct.
Check point
• Check for sudden load change.
• Check that the number of PLG pulses differ from the actual number of PLG pulses.
• Set the Pr. 870 "speed deviation level" and Pr. 871 "speed deviation time" values correctly.
Corrective action • Keep load stable.
• Set the correct number of PLG pulses in Pr. 851.
Operation Panel
E.ECT
Indication
Name Open cable detection
Description Stops the inverter output if the PLG signal is shut off.
• Check for an open cable of the PLG signal.
• Check that the PLG specifications are correct.
Check point
• Check for a loose connector.
• Check that the jumper connector of the rear of the control terminal is correctly set.
• Remedy the open cable.
• Use the PLG that meets the specifications.
Corrective action
• Make connection securely.
• Set the jumper connector of the rear of the control terminal correctly. (Refer to page 12.)
Operation Panel
E.OD
Indication
Name
Position error large
Indicates that the difference between the position command and position feedback exceeded the
Description
reference.
• Check that the position detecting encoder mounting orientation matches the parameter.
• Check that the load is not large.
Check point
• Check that the Pr. 427 "error excess level" and Pr. 851 "number of PLG pulses" values are
correct.
• Check the parameters.
Corrective action
• Reduce the load weight.
• Set the Pr. 427 "error excess level" and Pr. 851 "number of PLG pulses" values correctly.
Operation Panel
E.ECA
Indication
Name
Orientation encoder no-signal
Description
The encoder pulse for the FR-V5AM or FR-A5AP is not input.
• Check that the FR-V5AM or FR-A5AP is connected correctly.
• Check for a loose connector.
Check point
• Check for an open cable.
• Check for a detector fault.
• Make connection securely.
Corrective action
• Change the cable.
• Replace the detector.
FR-PU04V Overspeed occurrence
FR-PU04V Excessive speed deflection
FR-PU04V No encoder signal
FR-PU04V Excessive position error
FR-PU04V No encoder A signal
76
Errors (Alarms)
6