Mitsubishi FR-A740-00023-EC, Инструкция по эксплуатации

Страница: 414 / 474

404
Causes and corrective actions
Operation Panel
Indication
E.OS
FR-PU04
FR-PU07
Overspeed occurrence
Name
Overspeed occurence
Description
Appears when the motor speed reaches and exceeds the overspeed setting level under encoder
feedback control, real sensorless vector control or vector control.
Check point
· Check that the
Pr. 374 Overspeed detection level
value is correct.
· Check that the number of encoder pulses does not differ from the actual number of encoder pulses.
Corrective action
· Set the Pr. 374 Overspeed detection level value correctly.
· Set the correct number of encoder pulses in Pr. 369 Number of encoder pulses .
Operation Panel
Indication
E.OSD
FR-PU04
FR-PU07
Excessive speed deflection
Name
Speed deviation excess detection
Description
Stops the inverter output if the motor speed is increased or decreased under the influence of the load
etc. during vector control and cannot be controlled in accordance with the speed command value.
Check point
· Check that the values of Pr. 285 Excessive speed deviation detection frequency and Pr. 853 Speed deviation
time are correct.
· Check for sudden load change.
· Check that the number of encoder pulses does not differ from the actual number of encoder pulses.
Corrective action
· Set Pr. 285 Excessive speed deviation detection frequency and Pr. 853 Speed deviation time correctly.
· Keep load stable.
· Set the correct number of encoder pulses in
Pr. 369 Number of encoder pulses .
Operation Panel
Indication
E.ECT
FR-PU04
FR-PU07
No encoder signal
Name
Signal loss detection
Description
Stops the inverter output when the encoder signal is shut off under orientation control, encoder
feedback control or vector control.
Check point
· Check for the encoder signal loss.
· Check that the encoder specifications are correct.
· Check for a loose connector.
· Check that the switch setting of the FR-A7AP is correct.
· Check that the power is supplied to the encoder. Or, check that the power is not supplied to the
encoder later than the inverter.
Corrective action
· Remedy the signal loss.
· Use an encoder that meets the specifications.
· Make connection securely.
· Make a switch setting of the FR-A7AP correctly.
(Refer to page 32)
· Supply the power to the encoder. Or supply the power to the encoder at the same time when the
power is supplied to the inverter.
If the power is supplied to the encoder after the inverter, check that the encoder signal is securely
sent and set "0" in
Pr. 376 .
Operation Panel
Indication
E.OD
FR-PU04
FR-PU07
Fault 14
Excessive position error
Name
Excessive position error
Description
Indicates that the difference between the position command and position feedback exceeded the
reference under position control.
Check point
· Check that the position detecting encoder mounting orientation matches the parameter.
· Check that the load is not large.
· Check that the
Pr. 427 Excessive level error and Pr. 369 Number of encoder pulses are correct.
Corrective action
· Check the parameters.
· Reduce the load weight.
· Set the
Pr. 427 Excessive level error and Pr. 369 Number of encoder pulses correctly.
Operation Panel
Indication
E.EP
FR-PU04 Fault 14
FR-PU07 E.EP
Name
Encoder phase error
Description
The rotation command of the inverter differs from the actual motor rotation direction detected from the
encoder during offline auto tuning.
Check point
· Check for mis-wiring of the encoder cable.
· Check for wrong setting of
Pr. 359 Encoder rotation direction .
Corrective action
· Perform connection and wiring securely.
· Change the
Pr. 359 Encoder rotation direction value.