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
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Solid State Frequency Converter Rotary Frequency Converter

Rotary Design


Problem:Transocean cable repair ship requires 50 Hz
Solution:Model 200IND6050 in modified shipping container

Our Model 200IND6050QM is designed for converting shore power(60hz. in this case, could be 50hz.) to ships 50hz.(could be 60hz.) "hotel power", i.e., air conditioning, lighting, pumps etc. that are normally needed when the ship is in port to support personnel on board without running the main engines while at the dock.

The unit is housed in a 10' long X 8' wide X 90" high modified half of an international standard 20' shipping container. The ventilated container is equipped with splash proof, weather tight doors, interior lighting and fork lift slots. The unit pictured above is rated at 200KVA (and the same container 10' long can be used up to 313KVA) but this type of container can be used for units up to 1000KVA and perhaps higher in longer configurations.

The unit has anti-condensation heating coils in the windings of both the motor and generator and is designed for both onshore (land end of pier, no wave action) or on board (splash but no wave action) use. The unit shown above is installed on board on-deck a transocean cable repair ship but is actually used when the ship is docked at any 60hz. port(that is No. and So. America). While on board, the coil heaters are kept separately powered by 50hz. source to prevent condensation (not needed in a 60hz. shore installation, it is automatic). The louvered air intake (located in the bottom half of one side of the doors) is equipped with a splash guard duct type riser and the 24" motor-driven fan louvered air outlet is located on the end opposite the doors. This design provides complete protection from high wind driven splash but not inundating wave protection (the air intake duct only rises 3', see photo back of door).

The units operating noise is reduced with a specially designed sound attenuating partial foam interior lining which reduces the audible noise level to 74dBa@ 3 ft.(except right up in the air exhaust stream which is @80dBa unless you add an upward/ downward foam lined maze to the air outlet). This satisfies the environmental concerns of port authorities. A home dishwasher runs at about 75dBa.@3ft.

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