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Christopher AcostaAug 20, 2025
How to unlock password on Mitsubishi Inverter?
- KKimberly SpencerAug 20, 2025
To unlock a password-locked Mitsubishi Inverter, enter the password in Pr. 297 Password lock/unlock before operating.
How to unlock password on Mitsubishi 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 FR-D720-5.5K Inverter?
To release the operation panel lock on the Mitsubishi Inverter, press the lock button for 2 seconds.
What to do if Mitsubishi Inverter 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-D720-5.5K 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 FR-D720-5.5K 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 FR-D720-5.5K 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 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 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-D720-5.5K?
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.
Details on terminal connections, main circuit, control circuit, and safety stop wiring.
Important safety and operational guidelines to prevent damage or malfunction.
Details on the functions and indicators of the inverter's operation panel.
Procedures for resetting protective functions after a fault occurs.
Table of operation panel indications for faults, warnings, and alarms.
Detailed troubleshooting guide with possible causes and solutions for errors.
Step-by-step guide to diagnose common operational issues.
General| Model | FR-D720-5.5K |
|---|---|
| Series | FR-D700 |
| Category | Inverter |
| Rated Output Power | 5.5 kW |
| Applicable Motor Capacity | 5.5kW |
| Input Frequency | 50/60 Hz |
| Output Frequency | 0.5-400 Hz |
| Enclosure Rating | IP20 |
| Horsepower | 7.5 HP |
| Overload Capacity | 150% for 1 minute |
| Control Method | V/f control |
| Protection Features | Overcurrent, overvoltage, undervoltage, overload, short circuit, ground fault, overheating |
| Operating Temperature | -10°C to +50°C |
| Storage Temperature | -20°C to +65°C |
| Humidity | 95% RH or less (non-condensing) |
| Altitude | Up to 1000 m |
| Built-in Functions | PID control |
| Cooling Method | Forced air cooling |
