Mitsubishi Electric 800 Series Instruction Manual page 641

Causes and corrective actions
Abbreviation
Name
Description
Check point
Corrective action
Abbreviation
Name
Description
Check point
Corrective action
Abbreviation
Name
Description
Check point
Corrective action
Abbreviation
Name
Description
Check point
Corrective action
Abbreviation
Name
Description
Check point
Corrective action
Abbreviation
Name
Description
Check point
Corrective action
640
PROTECTIVE FUNCTIONS
E.LUP
Brake transistor alarm 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 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.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.
• 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. (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.
FR-LU08
Upper limit fault detection
FR-PU07
FR-LU08
Lower limit fault detection
FR-PU07
FR-LU08
Br.Cct.Fault
FR-PU07
FR-LU08
Ground Fault
FR-PU07
FR-LU08 Output phase loss
FR-PU07 E.LF
FR-LU08
OH Fault
FR-PU07