Single Phase Frequency Converters 50/60 Hz
18 models 1KVA to 20KVA
50 or 60hz input,
50hz or 60hz output
Single Phase Frequency Converters 400hz
18 models 1KVA to 20KVA
50hz or 60hz input and
400hz output
Three Phase Solid State Frequency Converters
50 or 60 Hz
57 models 10 to 320KVA
Three Phase Solid State Frequency Converters
57 models 10 to 320KVA
Solid State Design Considerations Manuals and Connection Diagrams Accessories
Outdoor Enclosures, Carts,
Distribution Panels etc.
Notes and Photos
Rotary 1 or 3 Phase Frequency Converters
50 or 60hz output
6KVA to 2000KVA
Rotary 400Hz output Frequency Converters
1 or 3phase
10KVA to 250 KVA
Rotary Frequency Converters Accessories
Enclosures (Indoor quietized and Outdoor) Digital Meters, RS232 and Data Logging, etc.
Rotary Design Considerations Starting Surge of motors in the load, Large SCR loads, power factor and resistive loads, Operating Noise Level.
Rotary Application Notes and Photos Operating Noise and solutions to this problem Line Isolation Sets
  Visicomm Industries
Solid State Frequency Converter Rotary Frequency Converter

Rotary Design


Industry: Multi-Plant Consumer Mfg.
Problem: Moving a plant to China and unable to convert all machines to 50 Hz operation

Solution: Model 62.5IND5060QV

The above 62.5 KVA unit takes in 3 phase, 380 VAC, 50 Hz (or 415 VAC) and produces 3 phase, 120/208 VAC, 60 Hz (or 480 VAC). The 62.5 KVA rated output is capable of carrying the entire plant load. Two were ordered for initial redundancy and future expansion. The unit is equipped with a standard output circuit breaker panel and numerous breakers for specific machines, which are shown mounted on the outside of the enclosure.

The enclosure is an acoustic foam (two layers separated by a dense damper and foil faced - flame retardant) lined heavy gauge enameled steel self ventilated indoor enclosure. The panels have knurled knobs for easy lift off and removal. The unit utilizes our vertical stacked construction to minimize floor space (note the forklift slots in the base).

The motor and generator are brushless and equipped with permanently sealed bearings. The only recommended spare parts are a solid state voltage regulator module (low coast) and a set of diodes, both of which are easily replaced, should the need ever arise. Over a typical 25 to 30-year operating life, we would anticipate changing the voltage regulator once to twice, the belts about ever 7 or 8 years and the bearings after 10 or 12 years of hard use. Belts and bearing are worldwide standard machinery parts in stock in any fair sized city worldwide. Replacement time is measured in hours. Compare this to a solid state design with it’s multitude of parts that go obsolete and impossible to find within a few years, and you can see why the rotary design should be used where reliability is crucial. Solid state designs involve several PC board modules and the repair approach is to switch out modules, which sounds simple. The reality is that damage usually involves more than one module (especially damage due to utility transients, to where solid state is much more vulnerable than rotary), and it takes a very skilled technician familiar with the circuitry and a full set of all components to repair. Which design would you rather be responsible for in China?

This size quietizing enclosure is used for units from 50 KVA to 100 KVA. The next size enclosure is used for 125 KVA to 313 KVA(Dimensions: A=79” B=41.25” C=86”).

Click Image to Enlarge
Photo showing the interior of the enclosure

Model 62.5IND5060QV
Sound level: 75dBa @ 3 ft.

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