Mitsubishi Electric FR-F800 Instruction Manual page 541

Causes and corrective actions
Operation panel
indication
Name
Description
Check point
Corrective action

MT appears for all of MT1, MT2 and MT3.
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
540
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.
EV
24 V external power supply operation
Flickers when the main circuit power supply is off and the 24 V external power supply is being input.
• Power is supplied from a 24 V external power supply.
• Turning ON the power supply (main circuit) of the inverter clears the indication.
• If the indication is still displayed after turning ON of the power supply (main circuit) of the inverter, the power
supply voltage may be low, or the jumper between the terminals P/+ and P1 may be disconnected.
ED
Emergency drive in operation
Appears during emergency drive operation.
• Emergency drive operation is performed by turning ON X84 signal.
• The display is cleared when the emergency drive operation ends. (Refer to
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.
to
FR-PU07
page
FR-PU07
FR-PU07
FR-PU07
FR-PU07
MT

184.)
—
—
—
page 238.)
—