Mitsubishi Inverter Repair in Rayong, Thailand: FR-A700 / FR-A800 / FR-F700 Series
Ducheng Industrial (Thailand) Limited (DCiT) runs a repair center in Phana Nikhom Subdistrict, Nikhom Phatthana District, Rayong, for regional and multinational plants. We inspect and repair VFDs (inverters). This page is for users of Mitsubishi FR-A700, FR-A800 and FR-F700 series inverters who want the general meaning of common alarm codes and to know how sending a unit in for repair works.
Our scope, stated plainly
We do not repair every model or brand. We only take on work we can do well.
Brand and model names are used only to identify equipment and do not imply any agency or manufacturer certification.
- —Mitsubishi models we have repaired: FR-A740 / FR-A840
- —Any other model, including the FR-F700 series: please send the model from the nameplate and ask first
- —High-power low-voltage drives can be repaired as complete units
A real case (anonymous)
A high-power Mitsubishi FR-A740 was repaired by replacing the IGBT and the Hall elements.
This is our repair experience, not a diagnosis of any specific unit, and not a guarantee of the result for any other unit.
Common Mitsubishi inverter alarm codes
This table summarizes the meanings of codes published in Mitsubishi's public manuals (based on the FR-A700 manual). Code names and the models that support them can differ slightly between series, so always follow the manual for your exact model. The same code can come from several causes, so the unit has to be inspected before concluding which part has failed.
| Code | Meaning per Mitsubishi manual (general) |
|---|---|
| E.OC1 | Overcurrent trip during acceleration |
| E.OC2 | Overcurrent trip during constant speed |
| E.OC3 | Overcurrent trip during deceleration or stop |
| E.OV1 | Regenerative overvoltage trip during acceleration |
| E.OV2 | Regenerative overvoltage trip during constant speed |
| E.OV3 | Regenerative overvoltage trip during deceleration or stop |
| E.THT | Inverter overload trip (electronic thermal relay function) |
| E.THM | Motor overload trip (electronic thermal relay function) |
| E.FIN | Heatsink (fin) overheat |
| E.IPF | Instantaneous power failure |
| E.UVT | Undervoltage |
| E.ILF | Input phase loss (applies to some models only) |
| E.GF | Output-side earth (ground) fault overcurrent |
| E.LF | Output phase loss |
How sending a unit for repair works
- 01Send us the details by phone or email: brand and model from the nameplate (clear photo), the alarm code or symptom on the display, what the drive was doing before it failed (for example at start-up, under load, or after a power dip), and photos of the unit.
- 02We give a first assessment from the information received.
- 03When the unit arrives, we open it and inspect its actual condition to see which parts have failed.
- 04Price and lead time are given after the inspection.
Testing
We have a high-power back-to-back motor test setup. Test scope depends on the model and the condition of each unit.
FAQ
What should I prepare before sending a Mitsubishi inverter for repair in Rayong?
The brand and model from the nameplate (a clear photo), the alarm code or symptom shown on the display, what the drive was doing when it failed (for example at start-up, under load, or after a power dip), and photos of the unit. Send them by phone or email and we can give a first assessment before the unit is sent in.
Which Mitsubishi inverter models do you repair? Do you repair every model?
No, we do not repair every model or brand. The Mitsubishi models we have repaired are the FR-A740 and FR-A840. For any other model, for example one in the FR-F700 series, send the model from the nameplate and ask first, and we will tell you whether we can take it in. Brand and model names are used only to identify equipment and do not imply any agency or manufacturer certification.
What should I do when a Mitsubishi inverter shows E.OC1 or E.GF?
The meaning of an alarm code must follow the manufacturer's manual for that exact model. Do not keep re-applying power to try restarting. Photograph the display and nameplate and send them to us, and we will tell you whether the unit should come to our bench. The same code can come from several causes, so the unit has to be opened and inspected before any conclusion is drawn.
How much does a Mitsubishi inverter repair cost, and how long does it take?
Price and lead time are given after we have inspected the actual unit, because the same symptom can come from different failed parts. We do not quote a price or a time in advance from the model or the alarm code alone.
Is it better to repair or replace a Mitsubishi inverter?
It depends on what has actually failed in each unit. We suggest opening it first to see exactly which parts are damaged, then deciding. A real anonymous example: a high-power Mitsubishi FR-A740 was repaired by replacing the IGBT and the Hall elements. Each unit differs, and this is not a guarantee of the result for any other unit.
Contact
- Ducheng Industrial (Thailand) Limited
- Address: 437/3, Moo 8, Phana Nikhom Subdistrict, Nikhom Phatthana District, Rayong 21180, Thailand
- Phone · China: +86 151 5812 7706
- Phone · Hong Kong: +852 4442 5000
- Phone · Vietnam: +86 186 1176 1939
- Phone · Thailand: +66 88 660 6999
- Phone · Thailand: 090 896 0086 (+66 90 896 0086)
- Hours: Mon–Sat 7:30–22:00, Sun 7:30–12:00
- Email: dongsheng.zhu@ducheng-industrial.com
- Website: ducheng-industrial.com
Drive fault, or a planned shutdown coming up?
Send the drive brand, model, fault code and nameplate photo — an engineer reviews every request.