Mitsubishi Electric FR-A820-00046 Instruction Manual page 904

Causes and corrective actions
Operation panel
indication
Name
Description
Check point
Corrective action
MT appears for all of MT1, MT2 and MT3 on the FR-PU07.
Operation panel
indication
Name
Description
Check point
Corrective action
Operation panel
indication
Name
Description
Check point
Corrective action
The FR-PU07 does not display them.
Operation panel
indication
Name
Description
Check point
Corrective action
6 - 16
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 page 5-227.)
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 5-166.
Identify the cause of the error occurrence.
Check the parameter setting, and check that the input signal is correct.
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.
to
FR-LU-08
FR-LU-08
to
FR-LU-08
FR-LU-08
Protective functions
MT1 to MT3
UF
HP1 to HP3
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