Mitsubishi Electric FR-A820-00046 (0.4K) Instruction Manual page 755

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
756
6. PROTECTIVE FUNCTIONS
6.5 Causes and corrective actions
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.
E.LF
Output phase loss
The inverter output is shut off 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
E.OHT
External thermal relay operation
The inverter output is shut off 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.
FR-LU08 indication Lower limit fault detection
FR-LU08 indication Br. Cct. Fault
FR-LU08 indication Ground Fault
FR-LU08 indication Output phase loss
604). (PM sensorless vector control)
FR-LU08 indication Ext TH relay oper