Mitsubishi Electric FR-A820-00046 Instruction Manual page 913

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.BE
Brake transistor alarm detection
The inverter trips 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 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.
E.LF
Output phase loss
The inverter trips if one of the three phases (U, V, W) on the inverter's output side (load side) is
lost.
Check the wiring. (Check that the motor is normally operating.)
Check that the capacity of the motor used is not smaller than that of the inverter.
Check if a start command is given to the inverter while the motor is coasting.
(PM sensorless vector control)
Wire the cables properly.
Input a start command after the motor stops. Alternatively, use the automatic restart after
instantaneous power failure/flying start function (page 5-571).
(PM sensorless vector control)
E.OHT
External thermal relay operation
The inverter trips if the external thermal relay provided for motor overheat protection or the
internally mounted thermal relay in the motor, etc. switches ON (contacts open).
This function is available when "7" (OH signal) is set in any of Pr. 178 to Pr. 189 (input terminal
function selection). This protective function is not available in the initial status. (OH signal is not
assigned.)
Check for motor overheating.
Check that the value "7" (OH signal) is set correctly to any of Pr. 178 to Pr. 189 (input terminal
function selection).
Reduce the load and operation duty.
Even if the relay contacts are reset automatically, the inverter will not restart unless it is reset.
Causes and corrective actions
FR-LU-08 Br.Cct.Fault
FR-LU-08 Ground Fault
FR-LU-08 Output phase loss
FR-LU-08 Ext TH relay oper
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