Mitsubishi Electric FR-A700 Instruction Manual page 738

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
7 - 20
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 3-35)
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 excee-
ded 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 detec-
ted 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".
E.P24
24V DC power output short circuit
When the 24V DC power output from the PC terminal is shorted, this function shuts off the
power output.
At this time, all external contact inputs switch off. The inverter cannot be reset by entering
the RES signal. To reset it, use the operation panel or switch power off, then on again.
Check for a short circuit in the PC terminal output.
Remedy the earth (ground) fault portion.
FR-PU04
E.ECT
FR-PU07
FR-PU04 —
FR-PU07 E. Od
FR-PU04 Fault 14
FR-PU07 E.EP
FR-PU04
E.P24
FR-PU07
Troubleshooting