Mitsubishi Electric FR-A800 Series Instruction Manual page 791

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
790
6. PROTECTIVE FUNCTIONS
6.5 Causes and corrective actions
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E.SOT
PM PM PM
Loss of synchronism detection
The inverter output is shut off when the motor operation is not synchronized. (This function is only available under
PM sensorless vector control.)
• Check that the PM motor is not driven overloaded.
• Check if a start command is given to the inverter while the PM motor is coasting.
• Check if a motor is connected under PM sensorless vector control.
• Check if a PM motor other than the MM-CF series is driven.
• Set the acceleration time longer.
• Reduce the load.
• If the inverter restarts during coasting, set Pr.57 Restart coasting time ≠ "9999", and select the automatic
restart after instantaneous power failure.
• Check the connection of the IPM motor.
• For the test operation without connecting a motor, select the PM sensorless vector control test operation.
(Refer to page 224.)
• Drive an IPM motor (MM-CF series).
• When driving an IPM motor other than MM-CF series, offline auto tuning must be performed. (Refer to
551.)
E.LUP
Upper limit fault detection
The inverter output is shut off when the load exceeds the upper limit fault detection range. This protective
function is not available in the initial setting of Pr.1490 (Pr.1490 = "9999").
• Check if too much load is applied to the equipment.
• Check that the load characteristics settings are correct.
• Inspect the equipment.
• Set the load characteristics (Pr.1481 to Pr.1487) correctly.
E.LDN
Lower limit fault detection
The inverter output is shut off when the load falls below the lower limit fault detection range. This protective
function is not available in the initial setting of Pr.1491 (Pr.1491 = "9999").
• Check if the equipment load is too light.
• Check that the load characteristics settings are correct.
• Inspect the equipment.
• Set the load characteristics (Pr.1481 to Pr.1487) correctly.
E.BE
Brake transistor alarm detection
• The inverter output is shut off if a fault due to damage of the brake transistor and such occurs in the brake
circuit.
In such a case, the power supply to the inverter must be shut off immediately.
• Appears when an internal circuit fault occurred for separated converter types and IP55 compatible models.
• Reduce the load inertia.
• Check that the brake duty is proper.
Replace the inverter.
E.GF
Output side earth (ground) fault overcurrent
The inverter output is shut off if an earth (ground) fault overcurrent flows due to an earth (ground) fault that
occurred on the inverter's output side (load side).
Check for a ground fault in the motor and connection cable.
Remedy the earth (ground) fault portion.
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FR-LU08 indication Motor Step Out
FR-LU08 indication Upper limit fault
FR-LU08 indication Lower limit fault
FR-LU08 indication Brake transistor err
FR-LU08 indication Ground Fault
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