Mitsubishi Electric 800 Series Instruction Manual page 635

Causes and corrective actions
Abbreviation
Name
Description
Check point
Corrective action

MT appears for all of MT1, MT2 and MT3.
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
634
PROTECTIVE FUNCTIONS
MT1 to MT3
Maintenance signal output 1 to 3
Appears when the inverter's cumulative energization time reaches or exceeds the parameter set value. Set
the time until the MT is displayed using Pr.504 Maintenance timer 1 warning output set time (MT1), Pr.687
Maintenance timer 2 warning output set time (MT2), and Pr.689 Maintenance timer 3 warning output
set time (MT3).
MT does not appear when the settings of Pr.504, Pr.687, and Pr.689 are initial values (9999).
The set time of maintenance timer has been exceeded. (Refer to
Take appropriate countermeasures according to the purpose of the maintenance timer setting.
Setting "0" in Pr.503 Maintenance timer 1, Pr.686 Maintenance timer 2, and Pr.688 Maintenance timer 3
clears the indication.
UF
USB host error
Appears when an excessive current flows into the USB A connector.
Check if a USB device other than a USB memory device is connected to the USB A connector.
• If a device other than a USB memory device is connected to the USB A connector, remove the device.
• Setting Pr.1049 USB host reset = "1" or inverter reset clears the UF indication.
HP1 to HP3
Home position return error
Appears when an error occurs during the home position return operation under position control. For the
details, refer to page 218.
Identify the cause of the error occurrence.
Check the parameter setting, and check that the input signal is correct.
CF
Continuous operation during communication fault
Appears when the operation continues while an error is occurring in the communication line or
communication option (when Pr.502 = "4").
• Check for a break in the communication cable.
• Check for communication option faults.
• Check the connection of communication cable.
• Replace the communication option.
LDF
Load fault warning
Appears when the load is deviated from the detection width set in Pr.1488 Upper limit warning detection
width or Pr.1489 Lower limit warning detection width.
• Check if too much load is applied to the equipment, or if the 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.
FR-LU08 MT1 to MT3
FR-PU07 MT

page 266.)
FR-LU08 UF
FR-PU07 —
FR-LU08 HP1 to HP3
FR-PU07 —
FR-LU08 CF
FR-PU07 —
FR-LU08 LDF
FR-PU07 —