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Amber WilliamsAug 19, 2025
How to unlock password on Mitsubishi FR-D740-1.5K Inverter?
- CChristina LoganAug 20, 2025
To unlock a password-locked Mitsubishi Inverter, enter the password in Pr. 297 Password lock/unlock before operating.
To Next PageTo Next PageHow to unlock password on Mitsubishi FR-D740-1.5K Inverter?
To unlock a password-locked Mitsubishi Inverter, enter the password in Pr. 297 Password lock/unlock before operating.
How to unlock operation panel on Mitsubishi Inverter?
To release the operation panel lock on the Mitsubishi Inverter, press the lock button for 2 seconds.
What to do if Mitsubishi FR-D740-1.5K shows overload trip error?
If the temperature of the output transistor element exceeds the protection level when a current not less than the rated inverter current flows (200% or less), the electronic thermal relay activates, stopping the Mitsubishi Inverter output. To resolve this, try increasing the acceleration/deceleration time or adjusting the torque boost setting.
Why is my Mitsubishi FR-D740-1.5K showing an undervoltage error?
If the Mitsubishi Inverter's power supply voltage decreases, the control circuit won't function normally. Check the power supply system equipment, including the power supply itself, to resolve this issue.
How to fix a write disable error on a Mitsubishi Inverter?
A write disable error on your Mitsubishi Inverter can occur due to several reasons. First, it could be because you're trying to change a parameter when Pr. 77 (Parameter write selection) is set to disable writing. Check the setting of Pr. 77 to resolve this. Second, the frequency jump setting range might be overlapping; review the settings of Pr. 31 to Pr. 36 (frequency jump). Finally, the PU and inverter may not be communicating correctly; check their connection.
What causes a motor overload trip on a Mitsubishi Inverter?
The Mitsubishi Inverter's electronic thermal relay function detects motor overheat, which can be caused by overload or reduced cooling during constant-speed operation. To resolve this, reduce the load weight.
What does stall prevention (overcurrent) mean on a Mitsubishi Inverter?
During acceleration, if the Mitsubishi Inverter's output current exceeds the stall prevention operation level (Pr. 22 Stall prevention operation level, etc.), the function stops the frequency increase until the overload current decreases. This prevents the inverter from an overcurrent trip.
What to do if Mitsubishi FR-D740-1.5K shows input phase loss?
The Mitsubishi Inverter trips if Pr. 872 Input phase loss protection selection is set to valid (=1) and one phase of the three-phase power input is lost. Ensure the cables are properly wired and repair any breaks in the cable.
Why does my Mitsubishi FR-D740-1.5K Inverter show a write error during operation?
A write error during operation on a Mitsubishi Inverter happens when parameter writing is performed during operation with a value other than "2" set in Pr. 77, and the STF (STR) is ON. To solve this, set "2" in Pr. 77 or stop the operation before making parameter settings.
How to troubleshoot output phase loss on a Mitsubishi FR-D740-1.5K Inverter?
Output phase loss on a Mitsubishi Inverter occurs if one of the three phases (U, V, W) on the inverter's output side is lost during operation. Ensure the cables are properly wired.
General| Brand | Mitsubishi |
|---|---|
| Model | FR-D740-1.5K |
| Category | Inverter |
| Language | English |
Details the electrical wiring of the inverter, including terminal diagrams, main circuit, control circuit, and safety stop signals.
Lists essential safety and operational precautions to prevent product damage or shortened lifespan.
Explains failsafe methods, including interlocks and backup systems, to ensure machine safety during inverter operation.
Describes the names and functions of the inverter's operation panel for control and monitoring.
Covers essential pre-operation checks and parameter settings for optimal inverter and motor performance.
Explains using magnetic flux vector control for improved starting torque and low-speed performance.
Details the process of offline auto tuning to optimize motor performance by automatically measuring motor constants.
Explains how to start and stop the motor using the inverter's operation panel for frequency control.
Covers starting and stopping the motor using external signals connected to the inverter terminals.
Details the procedures for resetting inverter protective functions after a fault occurs.
Provides a comprehensive list of all possible fault and alarm codes displayed by the inverter, with page references.
Offers detailed explanations of common error messages and their corresponding causes and corrective actions.
Explains how to view and clear the inverter's fault history log for diagnostics.
Provides a systematic troubleshooting guide for common inverter and motor issues, covering various symptoms.
Lists possible causes and countermeasures when the motor fails to start, covering main circuit and input signal checks.
Addresses causes of abnormal noise from the motor or machine and suggests troubleshooting steps.
Details reasons for abnormal motor heating and troubleshooting steps, including motor and parameter checks.
Covers troubleshooting steps when the motor rotates in the wrong direction, checking wiring and settings.
Provides checks for discrepancies between the set speed and actual motor speed, including input signal and load issues.
Offers solutions for uneven acceleration or deceleration, focusing on time settings and torque boost.
Troubleshoots issues with changing operation modes, checking parameter settings and command sources.
Provides troubleshooting steps for excessive motor current, examining torque boost, V/F patterns, and load conditions.
