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> Diy: balanced rotary converter for welder and machines
Diy: balanced rotary converter for welder and machines
This is for plans and instructions to build
1. a rotary converter 4kW (5hp) based on standard parts, and
2. a digital rotary single to three-phase converters between 4kW and 24kW (5hp to 30hp) which requires a digital controller.
Non-digital converters can be used with simple machines in a home workshop.
Non-digital rotary converters (plan included) do not require a controller but have some minor drawbacks:
- Contactors wear and may fail after some years.
Digital rotary converters (nine plans are included) offer advanced features but require a special controller:
* No EMC emission, no RFI, no harmonics are generated. No filter, no shielding needed.
* Rides through black- and brown-outs.
* Manufactured since 1998, E- T- and F- controllers are used in more than 2600 converters worldwide today.
Digital non-rotary inverters (see DriveBooster listings) are lightweight but have some drawbacks too:
- in 50Hz networks, machines must be modified electrically before an inverter based system can be used.
- Electrolytic capacitors used have a limited lifetime (shorter at high temperatures).
- Due to rectifiers, the power factor is poor. Not important with smaller inverters.
- Harmonics in input current are high. Not important with smaller inverters.
- RFI (Radio Frequency Interference) filtering is needed to comply with codes.
Ask an electrician to finish the wiring and to connect your new converter to your machines.
A standard three-phase induction motor, 2 pole for digital, high efficiency style.
If digital: a EuroTech digital controller.
Parts, controllers, complete kits, phone and email support, complete solutions are available in the UK, the US, in Australia, in NZ.
Sources, parts and other details are published (google them) and are also listed in the supplied documents.
One wiring diagram for a 4kW or 5hp single to three-phase converter using contactors instead of a controller.
Nine wiring diagrams covering different converters 4 8 12 16 24kW (5 10 15 22 30HP) based on controller types E, T and F.
Part specifications, building instructions, tips. 15 pages.
Email and phone support for an electrician if needed.
No movies, no books, not the internal circuitry of the digital controllers.
Three-phase output will be (voltages are unbalanced with non-digital and controller E and balanced with controller T and F):
* in 60Hz networks: 3x 240V USA, Canada
* in 50Hz networks: 3x 415V UK, Ireland, Europe, Asia, Australia, New Zealand.
