Mitsubishi Electronics FR-V500 instruction manual Overspeed occurrence, Excessive speed deflection

				Errors (Alarms)
Operation Panel	E.OS		FR-PU04V	Overspeed occurrence
Indication
Name	Overspeed	occurrence
Description	Indicates that the motor speed has exceeded the overspeed setting level.
Check point	• Check that the Pr. 374 "overspeed detection level" value is correct.
	• Check that the number of PLG pulses differ from the actual number of PLG pulses.
Corrective action	• Set the Pr. 374 "overspeed detection level" value correctly.
	• Set the correct number of PLG pulses in Pr. 851.
Operation Panel	E.OSD		FR-PU04V	Excessive speed deflection
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
Check point	correct.
	• 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		FR-PU04V	No encoder signal
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 point	• Check that the PLG specifications are correct.
	• Check for a loose connector.
	• Check that the jumper connector of the rear of the control terminal is correctly set.
	• Remedy the open cable.
Corrective action	• Use the PLG that meets the specifications.
	• Make connection securely.
	• Set the jumper connector of the rear of the control terminal correctly. (Refer to page 12.)
Operation Panel	E.OD		FR-PU04V	Excessive position error
Indication
Name	Position error	large
Description	Indicates that the difference between the position command and position feedback exceeded the
	reference.
	• Check that the position detecting encoder mounting orientation matches the parameter.
Check point	• Check that the load is not large.
	• 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		FR-PU04V	No encoder A signal
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 point	• Check for a loose connector.
	• Check for an open cable.
	• Check for a detector fault.
	• Make connection securely.
Corrective action	• Change the cable.
	• Replace the detector.

ERRORS AND PROTECTIVE FUNCTIONS

6

76