Mitsubishi Electric FR-F820-00077 Instruction Manual page 835

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-F800
E.SOT PM PM PM
Loss of synchronism detection
The inverter trips when the motor operation is not synchronized. (This function is only available
under PM 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 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.
Check the connection of the IPM motor.
For a test run without connecting a motor, select the PM motor control test operation. (Refer
to page 5-42.)
Drive an IPM motor (MM-EFS/MM-THE4 series)
When driving an IPM motor other than MM-EFS/MM-THE4 series, offline auto tuning must
be performed. (Refer to page 5-316.)
E.LUP
Upper limit fault detection
When the load exceeds the upper limit fault detection range, the inverter trips. 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
When the load falls below the lower limit fault detection range, the inverter trips. 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.GF
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 the inverter's output side (load side).
Check for an earth (ground) fault in the motor and connection cable.
Remedy the earth (ground) fault portion.
Causes and corrective actions
FR-LU08 Motor Step Out
FR-LU08 Upper limit fault
FR-LU08 Lower limit fault
FR-LU08 Ground Fault
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