Electronic Thermal O/L Relay Pre-Alarm (Th Display) And Motor Overload Trip; L Relay) (E.thm Display) [Demonstration] - Mitsubishi Electric FATEC FR-A800 Manual

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BREAKDOWN MAINTENANCE
5.2.4 Electronic thermal O/L relay pre-alarm (TH display) and motor
overload trip (electronic thermal O/L relay) (E.THM display)
[Demonstration]
Change H000 (Pr.9) (Electronic thermal O/L relay) from "2.0" (setting value of the electronic thermal
O/L relay for the demonstration machine) to "1.00". Turn ON STF and high speed RH, and turn the
potentiometer of the load setting to the right as far as it goes after 60 Hz is displayed. Run the
inverter with the load ON at load torque 150%. Check that TH is displayed in approximately 30
seconds and E.THM is displayed in approximately 50 seconds, and that the motor is coasting.
(1) Corrective action
1) Use FR Configurator2 to measure the output current value when the electronic thermal O/L
relay pre-alarm (TH display) and the motor overload trip (Electronic thermal O/L relay)
(E.THM display) occurred.
Set the trigger position to 90%.
Task 1 Change H000 (Pr.9) (Electronic thermal O/L relay) and compare the output current values
and timings when E.THM is displayed.
After the demonstration
Reset H000 (Pr.9) (Electronic thermal O/L relay) to "2.0" (setting value of the electronic thermal O/L
relay for the demonstration machine).
5.2 Troubleshooting by the demonstration machine
Electronic thermal
relay function load
factor increases.
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