Mitsubishi Electric FR-F800 Instruction Manual page 546

E.SOT
Operation panel
indication
Name
Loss of synchronism detection
The inverter trips when the motor operation is not synchronized. (This function is only available under PM
Description
motor 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 point
• Check if a motor is connected under PM motor control.
• Check if a PM motor other than the MM-EFS/MM-THE4 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.
Corrective action • Check the connection of the IPM motor.
• For a test run without connecting a motor, select the PM motor control test operation.(Refer to
• Drive an IPM motor (MM-EFS/MM-THE4)
• When driving an IPM motor other than MM-EFS/MM-THE4 series, offline auto tuning must be performed.
(Refer to
Operation panel
E.LUP
indication
Name
Upper limit fault detection
When the load exceeds the upper limit fault detection range, the inverter trips. This protective function is not
Description
available in the initial setting of Pr.1490 (Pr.1490 = "9999").
• Check if too much load is applied to the equipment.
Check point
• Check that the load characteristics settings are correct.
• Inspect the equipment.
Corrective action
• Set the load characteristics (Pr.1481 to Pr.1487) correctly.
Operation panel
E.LDN
indication
Name
Lower limit fault detection
When the load falls below the lower limit fault detection range, the inverter trips. This protective function is not
Description
available in the initial setting of Pr.1491 (Pr.1491 = "9999").
• Check if the equipment load is too light.
Check point
• Check that the load characteristics settings are correct.
• Inspect the equipment.
Corrective action
• Set the load characteristics (Pr.1481 to Pr.1487) correctly.
Operation panel
indication
Name
Output side earth (ground) fault overcurrent
The inverter trips if an earth (ground) fault overcurrent flows due to an earth (ground) fault that occurred on
Description
the inverter's output side (load side).
Check point
Check for an earth (ground) fault in the motor and connection cable.
Corrective action
Remedy the earth (ground) fault portion.
PM PM PM
page 351.)
E.GF
Causes and corrective actions
FR-PU07 Motor step out
FR-PU07
FR-PU07
FR-PU07 Ground Fault
PROTECTIVE FUNCTIONS
page 144.)
Fault
Fault
545
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