Mitsubishi Electric FR-E740-0.4K User Manual (English)

Questions and Answers:

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Kevin JacobsAug 23, 2025
What to do if Mitsubishi Electric FR-E740-0.4K has overcurrent trip during constant speed?
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  Haley MccormickAug 23, 2025
  If your Mitsubishi Electric Inverter is experiencing an overcurrent trip during constant speed operation, it indicates that an overcurrent has occurred. To address this: * Ensure the load is stable. * Inspect the wiring for any output short circuits or ground faults. * Lower the stall prevention operation level. * Activate the stall prevention operation and the fast-response current limit operation (Pr.156). * If the motor is coasting, bring it to a stop before sending a start command. Alternatively, you can use the automatic restart after instantaneous power failure/flying start function.
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Michael ObrienAug 25, 2025
How to resolve overcurrent trip during deceleration or stop on Mitsubishi Electric FR-E740-0.4K Inverter?
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  Jeffrey MorenoAug 25, 2025
  If the Mitsubishi Electric Inverter experiences an overcurrent trip during deceleration or stop, it signifies that an overcurrent has occurred during these phases. Here’s what you can do: * Increase the deceleration time. * Check the wiring for output short circuits or ground faults. * Verify that the mechanical brake isn't activating too early. * Lower the stall prevention operation level. * Activate the stall prevention operation and the fast-response current limit operation (Pr.156). * If the motor is coasting, stop it before issuing a start command. Alternatively, use the automatic restart after instantaneous power failure/flying start function.
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velasquezjoseAug 27, 2025
How to fix regenerative overvoltage trip during deceleration or stop on Mitsubishi Electric FR-E740-0.4K Inverter?
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  Ethan HaleAug 27, 2025
  If your Mitsubishi Electric Inverter is tripping due to regenerative overvoltage during deceleration or stop, it means overvoltage has occurred. Try these solutions: * Increase the deceleration time to match the load's moment of inertia. * Make the brake cycle longer. * Use the regeneration avoidance function (Pr. 882, Pr. 883, Pr.885, Pr.886). * Consider using a brake resistor, brake unit, or power regeneration common converter (FR-CV) as needed.
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Jimmy RiveraAug 27, 2025
How to resolve regenerative overvoltage trip during acceleration on Mitsubishi Electric FR-E740-0.4K Inverter?
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  matthewjohnsonAug 28, 2025
  If your Mitsubishi Electric Inverter is tripping due to regenerative overvoltage during acceleration, it means overvoltage has occurred during acceleration. Here are some steps to take: * Decrease the acceleration time. * Implement the regeneration avoidance function using parameters Pr. 882, Pr. 883, Pr.885, and Pr. 886. * Ensure that the stall prevention operation level (Pr. 22) is set correctly.
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David FranklinAug 29, 2025
What to do if Mitsubishi Electric Inverter shows inverter overload trip?
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  Shannon HernandezAug 29, 2025
  If the Mitsubishi Electric Inverter experiences an overload trip (electronic thermal O/L relay function), it signifies that the electronic thermal relay function for inverter element protection has been activated. To address this: * Increase the acceleration time. * Adjust the torque boost setting (Pr. 0). * Configure the load pattern selection setting (Pr. 14) according to the machine's load pattern. * Reduce the load. * Ensure the surrounding air temperature is within specified limits.
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Charles JensenAug 30, 2025
What to do if Mitsubishi Electric FR-E740-0.4K Inverter heatsink overheat?
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  Matthew PhillipsAug 30, 2025
  If your Mitsubishi Electric Inverter's heatsink is overheating, it indicates that the heatsink temperature is too high. To address this: * Ensure the surrounding air temperature is within the specified limits. * Clean the heatsink to remove any dust or obstructions. * Replace the cooling fan if it is not functioning correctly.
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ccombsSep 1, 2025
Why does Mitsubishi Electric FR-E740-0.4K Inverter show input phase loss?
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  David JenningsSep 1, 2025
  If the Mitsubishi Electric Inverter is indicating an input phase loss, it means one of the three input phases is missing or the phase-to-phase voltage is significantly unbalanced. To resolve this: * Ensure all cables are correctly wired. * Repair any breaks in the cable. * Check the input phase loss protection setting (Pr. 872). If the three-phase input voltage is largely unbalanced, set Pr. 872 to '0' to disable input phase loss protection.
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Shaun BakerSep 2, 2025
What causes stall prevention stop on Mitsubishi Electric FR-E740-0.4K?
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  Benjamin KnoxSep 2, 2025
  If the Mitsubishi Electric Inverter has a stall prevention stop, it means the output frequency has decreased to 1Hz because of deceleration caused by excessive motor load. To fix this, reduce the load and check the stall prevention operation level setting (Pr. 22).
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Dennis FosterSep 4, 2025
What to do if Mitsubishi Electric FR-E740-0.4K shows overcurrent trip during acceleration?
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  Lori RomanSep 4, 2025
  If the Mitsubishi Electric Inverter experiences overcurrent during acceleration, it indicates that overcurrent has occurred. To resolve this, try the following: Set a longer acceleration time. If 'E.OC1' appears at start, disconnect the motor and restart the inverter. If 'E.OC1' persists, the inverter may be faulty and you should contact your sales representative. Check the wiring for output short circuit and ground fault. When the rated motor frequency is 50Hz, set the Pr. 3 Base frequency to 50Hz. Lower the stall prevention operation level. Activate the stall prevention operation and the fast-response current limit operation (Pr.156). For operations with frequent regenerative driving, set the base voltage in Pr. 19 Base frequency voltage.
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Ashley GordonSep 5, 2025
What to do if Mitsubishi Electric Inverter shows regenerative brake pre-alarm?
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  Frederick WilsonSep 5, 2025
  If the Mitsubishi Electric Inverter's regenerative brake duty reaches 85% of the Pr. 70 Special regenerative brake duty setting or higher, set a longer deceleration time and check the settings of Pr.30 Regenerative function selection and Pr. 70 Special regenerative brake duty.