Mitsubishi FR-A800

Causes and corrective actions
650
PROTECTIVE FUNCTIONS
Operation panel
indication
SA FR-PU07 —
Name
Safety stop
Description
Appears when safety stop function is activated (during output shutoff). (Refer to page 57.)
Check point
• Check if an emergency stop device is activated.
• Check if the shorting wire between S1 and PC or between S2 and PC is disconnected when not using the
safety stop function.
Corrective action
• An emergency stop device is active when using the safety stop function. Identify the cause of emergency
stop, ensure the safety and restart the system.
• When not using the safety stop function, short across terminals S1 and PC and across S2 and PC with
shorting wire for the inverter to run.
• If is indicated when wires across S1 and SIC and across S2 and SIC are both conducted while using
the safety stop function (drive enabled), internal failure might be the cause. Check the wiring of terminals
S1, S2 and SIC and contact your sales representative if the wiring has no fault.
Operation panel
indication
MT1 to MT3
to
FR-PU07 MT

Name
Maintenance signal output 1 to 3
Description
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).
Check point
The set time of maintenance timer has been exceeded. (Refer to page 282.)
Corrective action
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.
 MT appears for all of MT1, MT2 and MT3.
Operation panel
indication
UF FR-PU07 —
Name
USB host error
Description
Appears when an excessive current flows into the USB A connector.
Check point
Check if a USB device other than a USB memory device is connected to the USB A connector.
Corrective action
• 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.
Operation panel
indication
HP1 to HP3
to
FR-PU07 —
Name
Home position return error
Description
Appears when an error occurs during the home position return operation under position control. For the
details, refer to page 241.
Check point
Identify the cause of the error occurrence.
Corrective action
Check the parameter setting, and check that the input signal is correct.
Operation panel
indication
EV FR-PU07 —
Name
24 V external power supply operation
Description
Flickers when the main circuit power supply is off and the 24 V external power supply is being input.
Check point
• Power is supplied from a 24 V external power supply.
Corrective action
• 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.