Okay, let's break down the situation with this customer's Vevor digital phase converter and your considerations for installation.

Understanding Digital (Static) Phase Converters (like Vevor)



How They Work (Simplified)

You're right, they don't create a true third phase in the same way a rotary converter or VFD does. They use capacitors and electronic switching (controlled by the DSP) to introduce a phase shift, mimicking a three-phase waveform. This allows a three-phase motor to start and run.

Key Difference from Rotary and VFDs

The biggest drawback is that the generated "third leg" often isn't a perfectly balanced sine wave. This can lead to:

Reduced Motor Torque

The motor might not perform at its full rated power. This is often expressed as a percentage of rated HP (e.g., 60-80%).

Motor Heating

The imbalanced voltage and current can cause the motor to run hotter, potentially shortening its lifespan.

Starting Issues

Some motors can be difficult to start, especially under load.

Sensitivity to Load

Performance can vary significantly depending on the load on the motor. A near-no-load situation might be okay, but a heavily loaded motor can struggle.

Advantages



Lower Cost

Generally less expensive than rotary converters or VFDs, as your customer has found.

Smaller Size

More compact and easier to install than rotary converters.

Quieter Operation

Significantly less noisy than rotary converters.

Your Concerns and Installation Considerations



Overload Protection

The fact that the router has inherent overload protection is good. This will help protect the motor from damage if the converter isn't providing adequate power and the motor is working too hard. Verify exactly what overload protection is present. Is it a simple thermal overload switch or something more sophisticated?

Sizing

It's crucial to verify the converter's output capacity. Some of these cheaper converters might be optimistically rated. It might say it can handle 2 HP, but in reality, it might struggle with that load.

Vevor Brand

Vevor is generally considered a budget brand. While they can sometimes offer acceptable value, reliability can be a concern. Don't expect the same level of performance or lifespan as a higher-end brand.

Single 3-Phase Equipment

Since it's only one piece of equipment, trying the cheaper solution is a reasonable gamble. If the customer had multiple 3-phase machines, I'd strongly recommend a rotary converter or VFD.

Duty Cycle

Is this router going to be used intermittently for short periods, or will it be running for hours at a time? If it's only for hobby use and not constant production, the converter is less likely to be pushed to its limits.

Recommendations


Thoroughly Test

Before leaving the job, perform a thorough test with the router under a reasonable load. Use a good-quality multimeter with the ability to measure True RMS (TRMS) voltage and current.

Voltage Balance

Check the voltage on all three phases. A significant imbalance (more than a few percent) is a red flag. Ideally, phase-to-phase voltages should be very close to each other.

Current Draw

Measure the current on each phase while the router is running under load. Again, look for imbalances.

Motor Temperature

Run the router for a while and feel the motor housing. If it's excessively hot to the touch, the converter might be under-performing and stressing the motor.2.

Inform the Customer

Be upfront with the customer about the limitations of this type of converter. Explain that: The router might not deliver its full rated power. The motor could run hotter than it would on a true three-phase supply. There's a chance it could shorten the motor's lifespan. If he experiences problems (poor performance, motor overheating), a rotary converter or VFD would be a better solution.3.

Clear Installation

Follow all applicable electrical codes and best practices. Ensure proper grounding and overcurrent protection. Clearly label the converter and the 3-phase circuit.4.

Documentation

Document everything you do, including the voltage and current measurements you take during testing. This provides a record if the customer has problems later.5.

Consider a Clamp Meter with Phase Rotation

If you do a lot of three-phase work, a clamp meter that also reads phase rotation is incredibly valuable. It will quickly tell you if the phases are wired correctly.6.

VFDs

You mention VFDs. While they are more expensive, they offer significant advantages like variable speed control of the router (which can be very useful in woodworking) and smoother starting, reducing stress on the motor. A VFD is almost always the better solution, especially for more sophisticated woodworking setups.

In summary: You're right to be cautious. These cheaper DSP phase converters can be a bit of a gamble. Proceed carefully, test thoroughly, and be clear with the customer about the potential downsides. If the router runs smoothly, doesn't overheat, and the customer understands the limitations, it might be an acceptable solution for his hobby use. However, be prepared for the possibility that he might need to upgrade to a rotary converter or VFD later on. Flag for review