M
Mark SmithAug 20, 2025
How to unlock password on Mitsubishi FR-D740-5.5K?
- SSteven ScottAug 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-D740-5.5K?
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-D740-5.5K 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 Inverter 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 FR-D740-5.5K?
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 FR-D740-5.5K?
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 FR-D740-5.5K 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-D740-5.5K Inverter 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-D740-5.5K 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 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-D740-5.5K |
| Category | Inverter |
| Language | English |
Detailed instructions and diagrams for all wiring connections.
Overview of the basic steps for operating the inverter and motor.
Overview of the operation panel components and their functions.
Step-by-step guide to basic inverter operation using factory settings.
Step-by-step guide to changing parameter values via the operation panel.
Essential checks and parameter settings before starting inverter operation.
Setting Pr.9 for motor overheat protection using the inverter's electronic thermal relay.
Using Pr.0 to adjust torque boost for improved starting torque.
Selecting start and frequency command sources via Pr.79.
Using magnetic flux vector control for improved torque performance.
Guide to performing offline auto tuning for motor optimization.
Instructions for starting and stopping the motor using the operation panel.
How to set frequency using the operation panel buttons.
Using the setting dial as a potentiometer for operation.
Procedures to reset the inverter's protective functions.
Table listing fault and alarm codes and their corresponding pages.
Troubleshooting common error messages, warnings, alarms, and faults.
Procedure to check and clear the inverter's faults history.
Initial checks for common operational issues.
Checks and countermeasures when the motor does not start.
Checks and countermeasures for excessive motor current.
