Mitsubishi Electric FR-A800, Instruction Manual

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Protective functions Causes and corrective actions
FR-A800 6 - 33
Operation panel
indication
E.OD FR-LU-08 Position fault
Name Excessive position fault
Description
The inverter trips when the difference between the position command and position feedback
exceeds Pr. 427 "Excessive level error" under position control.
Check point
앫
Check that the position detecting encoder mounting orientation matches the parameter.
앫
Check that the load is not large.
앫
Check that the Pr. 427, Pr. 369 (851) "Number of encoder pulses" settings are correct.
Corrective action
앫
Check the parameters.
앫
Reduce the load.
앫
Set Pr. 427, Pr. 369 correctly.
Operation panel
indication
E.MB1 to E.MB7 to FR-LU-08
E.MB1 Fault to
E.MB7 Fault
Name Brake sequence fault
Description
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.)
Check point Find the cause of the fault occurrence.
Corrective action Check the set parameters and perform wiring properly.
Operation panel
indication
E.EP FR-LU-08 Encoder signal loss
Name Encoder phase fault
Description
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 point
앫
Check for mis-wiring of the encoder cable.
앫
Check if the Pr. 359 852)"Encoder rotation direction" setting is incorrect.
Corrective action
앫
Perform connection and wiring securely.
앫
Change the Pr. 359 (852) setting.
Operation panel
indication
E.MP FR-LU-08 —
Name Magnetic pole position unknown
Description
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 point
앫
Check for mis-wiring of the encoder cable.
앫
Check if the Pr. 359 "Encoder rotation direction" setting is incorrect.
Corrective action
앫
Perform connection and wiring securely.
앫
Change the Pr. 359 setting.
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