Okay, you're in a tricky spot. Running a Miller Proheat 35 designed for 460/575V on a 380V supply is a significant problem. Here's a breakdown of options and their considerations, ranging from simplest (but possibly impractical) to more complex (and likely more expensive)

Understanding the Problem:
Voltage Drop

Running the Proheat 35 at 380V will significantly reduce its output power. It's unlikely to work properly, and you risk damaging the equipment. Components inside the machine may be rated for a specific voltage range.

Transformer Availability

You're right, finding a readily available 380V to 460V/575V transformer is uncommon. This is because 380V is a more European standard, while 460V/575V is more North American.

Possible Solutions (Ordered by increasing complexity/cost)


Source a Custom Transformer



Details

This is the most reliable option, but likely the most expensive and time-consuming. You need a custom-built transformer designed to step up 380V to both 460V and 575V with the proper kVA rating (at least 35 kVA, but probably a bit higher to account for inrush current).

Pros

Provides the correct voltage, ensuring the Proheat 35 operates as intended. Extends the life of your machine and protects components from damage.

Cons

High cost, long lead time (custom manufacturing), potential for size and weight issues.

Action

Contact transformer manufacturers (search for "custom transformer manufacturers"). Provide them with the input voltage (380V), output voltages (460V and 575V), kVA rating (35kVA minimum, ideally higher), and frequency (typically 50 Hz or 60 Hz). They can provide a quote and lead time.2.

Step-Up Transformer to One Voltage (and Potentially Modify the Proheat)



Details

Find a 380V to 460V or a 380V to 575V transformer. You'll still need a custom or less common unit, but searching for only one of those voltage transformations might broaden the available options slightly.

Potentially (this requires VERY CAREFUL evaluation)

Investigate if the Proheat 35 can be internally rewired or reconfigured to operate on only one of the voltage options (460V or 575V). This is HIGHLY dependent on the internal design of the machine.

DO NOT ATTEMPT THIS WITHOUT THE MANUAL AND/OR CONSULTING WITH A QUALIFIED ELECTRICIAN FAMILIAR WITH THE PROHEAT 35. Pros

Potentially lower transformer cost compared to a dual-voltage custom transformer.

Cons

Requires modification of the Proheat 35 (potentially voiding warranty, creating safety hazards if done incorrectly). Still likely requires a special-order transformer.3.

Variable Frequency Drive (VFD) as a Voltage Booster (Highly Unlikely, Be Careful)



Details

Some advanced VFDs have the capability to boost voltage slightly. However, this is not their primary function, and using them solely for voltage boosting is generally a bad idea.

Why it's problematic



Not Designed for That

VFDs are primarily for motor speed control. Boosting voltage is a secondary function at best.

Voltage Limits

VFDs typically don't have the wide voltage boosting range you need (380V to 460V or 575V).

Harmonic Distortion

VFDs can introduce harmonic distortion into the power supply, which could damage the Proheat 35 or other equipment.

Overheating/Damage

Forcing a VFD to operate outside its designed parameters (just for voltage boosting) can lead to overheating and failure.

When it might be considered (VERY CAREFULLY)

If you only need a small voltage boost (e.g., 380V to 400V), and the VFD is significantly oversized, and you can confirm with the VFD manufacturer that it's acceptable to use it for this purpose within those limited parameters.

Even then, it's a risky approach. Pros

Potentially cheaper than a transformer (but often not).

Cons

Extremely risky, high potential for equipment damage, likely not suitable for the required voltage boost.

Action



DO NOT DO THIS WITHOUT EXTENSIVE RESEARCH, EXPERTISE, AND CONSULTATION WITH BOTH THE PROHEAT 35 MANUFACTURER AND THE VFD MANUFACTURER.4. Consider a Different Heating Method



Details

This is a "think outside the box" approach. If your application allows, could you use a different type of heating equipment that's compatible with 380V? Induction heating units, resistance heaters, or other technologies might be available that run directly on your site's power.

Pros

Avoids the voltage conversion problem altogether.

Cons

Requires a completely different equipment purchase, may not be suitable for your specific application, and might have different operating characteristics than the Proheat 35.

Action

Research alternative heating methods and their compatibility with your process requirements.5.

Change the Site Power Supply (Least Likely, Most Expensive, Most Disruptive)



Details

Theoretically, you could upgrade the electrical supply to your site to provide 460V or 575V. This is likely to be extremely expensive and time-consuming, involving working with the power company and re-wiring significant portions of your facility.

Pros

Solves the voltage problem permanently for all equipment.

Cons

Extremely high cost, significant downtime, major disruption to operations.

Action

This is usually not a viable option unless you have other compelling reasons to upgrade your site's power supply.

Recommendations


Contact Miller Electric

The first thing you should do is contact Miller Electric directly. They might have a recommended solution or know of transformers that have worked for other customers in similar situations. They might also be able to advise on whether the Proheat 35 can be reconfigured for single-voltage operation.2.

Custom Transformer

If Miller Electric doesn't offer a simpler solution, pursuing a custom transformer is the most reliable, although costly, option. Get quotes from several transformer manufacturers.3.

Careful Evaluation

If you're considering modifying the Proheat or using a VFD, proceed with extreme caution. Get expert advice from qualified electricians and engineers. The risk of damage is high.4.

Explore Alternatives

Consider if a different heating method would be more practical and cost-effective.

Crucial Warnings



Safety First

Working with high voltages is dangerous. Always disconnect power before working on electrical equipment. Use qualified electricians for all electrical work.

Warranty Voiding

Modifying the Proheat 35 or operating it outside its specified voltage range may void the warranty.

Equipment Damage

Running the Proheat 35 at the wrong voltage can damage the machine and create a fire hazard.*

Compliance: Ensure any modifications or electrical work complies with local electrical codes and regulations.I hope this comprehensive breakdown helps! Good luck finding the best solution for your situation. Flag for review