Mitsubishi Electric FR-A820-00046 Instruction Manual page 921

Protective functions
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
FR-A800
E.OD
Vector Vector Vector
Excessive position fault
The inverter trips when the difference between the position command and position feedback
exceeds Pr. 427 "Excessive level error" 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, Pr. 369 (851) "Number of encoder pulses" settings are correct.
Check the parameters.
Reduce the load.
Set Pr. 427, Pr. 369 correctly.
E.MB1 to E.MB7
Brake sequence fault
The inverter trips when a sequence error occurs during use of the brake sequence function
(Pr. 278 to Pr. 285). This protective function is not available in the initial status. (The brake
sequence function is invalid.) (For the details of fault record, refer to page 5-484.)
Find the cause of the fault occurrence.
Check the set parameters and perform wiring properly.
E.EP
Vector Vector Vector
Encoder phase fault
The inverter trips when the rotation command of the inverter differs from the actual motor
rotation direction detected from the encoder during offline auto tuning. This protective function
is not available in the initial status.
Check for mis-wiring of the encoder cable.
Check if the Pr. 359 852)"Encoder rotation direction" setting is incorrect.
Perform connection and wiring securely.
Change the Pr. 359 (852) setting.
E.MP
Magnetic pole position unknown
The inverter trips when the rotation command of the inverter differs from the actual motor
rotation direction detected from the encoder during offline auto tuning. This protective function
is not available in the initial status.
Check for mis-wiring of the encoder cable.
Check if the Pr. 359 "Encoder rotation direction" setting is incorrect.
Perform connection and wiring securely.
Change the Pr. 359 setting.
Causes and corrective actions
FR-LU-08
to FR-LU-08
FR-LU-08
FR-LU-08
Position fault
E.MB1 Fault to
E.MB7 Fault
Encoder signal loss
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