Mitsubishi Electric FR-A700 Series Instruction Manual page 146

Operation Panel
E.ECT
Indication
Name
Open cable detection
Stops the inverter output when the encoder signal is shut off under orientation control, encoder
Description
feedback control or vector control.
· Check for the encoder signal loss.
· Check that the encoder specifications are correct.
· Check for a loose connector.
Check point
· 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 open cable.
· Use an encoder that meets the specifications.
· Make connection securely.
· Make a switch setting of the FR-A7AP correctly. (Refer to page 29)
Corrective action
· 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
E.EOD
Indication
Name
Position error large
Indicates that the difference between the position command and position feedback exceeded the
Description
reference under position control.
· 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 Excessive level error and Pr. 369 Number of encoder pulses are correct.
· Check the parameters.
Corrective action · Reduce the load weight.
· Set the Pr. 427 Excessive level error and Pr. 369 Number of encoder pulses correctly.
Operation Panel
E.EP
Indication
Name Encoder phase error
The rotation command of the inverter differs from the actual motor rotation direction detected from the
Description
encoder during offline auto tuning.
· Check for mis-wiring of the encoder cable.
Check point
· Check for wrong setting of Pr. 359 Encoder rotation direction.
· Perform connection and wiring securely.
Corrective action
· Change the Pr. 359 Encoder rotation direction value.
Operation Panel
E.P24
Indication
Name 24VDC power output short circuit
When the 24VDC power output from the PC terminal is shorted, this function shuts off the power output.
Description
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 point
· Check for a short circuit in the PC terminal output.
Corrective action
· Remedy the earth (ground) fault portion.
Operation Panel
E.CDO
Indication
Name
Output current detection value exceeded
This function is activated when the output current exceeds the Pr. 150 Output current detection level
Description
setting.
Check the settings of Pr. 150 Output current detection level, Pr. 151 Output current detection signal delay time,
Check point Pr. 166 Output current detection signal retention time, Pr. 167 Output current detection operation selection.
(Refer to
FR-PU04
FR-PU07
FR-PU04
FR-PU07
FR-PU04
FR-PU07
FR-PU04
FR-PU07
FR-PU04
FR-PU07
Instruction Manual (applied).)
Causes and corrective actions
No encoder signal
Fault 14
Excessive position error
Fault 14
E.EP
E.P24
Fault 14
OC detect level
4
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