Mitsubishi Electric FR-A700 Instruction Manual page 420

Causes and corrective actions
Operation Panel
Indication
Name
Description
Check point
Corrective action
Operation Panel
Indication
Name
Description
Check point
Corrective action
Operation Panel
Indication
Name
Description
Check point
Corrective action
Operation Panel
Indication
Name
Description
Check point
Corrective action
Operation Panel
Indication
Name
Description
Check point
Corrective action
410
E.OS
Overspeed occurence
Appears when the motor speed reaches and exceeds the overspeed setting level under encoder
feedback control, real sensorless vector control or vector control.
· 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.
· Set the Pr. 374 Overspeed detection level value correctly.
· Set the correct number of encoder pulses in Pr. 369 Number of encoder pulses.
E.OSD
Speed deviation excess detection
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 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.
· 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.
E.ECT
Signal loss detection
Stops the inverter output when the encoder signal is shut off under orientation control, encoder
feedback control or vector control.
· 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.
· 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 37)
· 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.
E.OD
Excessive position error
Indicates that the difference between the position command and position feedback exceeded the
reference under position control.
· 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.
· Check the parameters.
· Reduce the load weight.
· Set the Pr. 427 Excessive level error and Pr. 369 Number of encoder pulses correctly.
E.EP
Encoder phase error
The rotation command of the inverter differs from the actual motor rotation direction detected from the
encoder during offline auto tuning.
· Check for mis-wiring of the encoder cable.
· Check for wrong setting of Pr. 359 Encoder rotation direction.
· Perform connection and wiring securely.
· Change the Pr. 359 Encoder rotation direction value.
FR-PU04
Overspeed occurrence
FR-PU07
FR-PU04
Excessive speed deflection
FR-PU07
FR-PU04
No encoder signal
FR-PU07
Fault 14
FR-PU04
FR-PU07
Excessive position error
FR-PU04 Fault 14
FR-PU07 E.EP