CPS - Contactless Power System

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CPS for cranes

In August of 1997 the comination of CPS and SMG was installed on a container crane at the Newport News Marine Terminal in Virginia, USA. The CPS system ist rated at 50 kW and the SMG system transmits PLC data at the maximum Genius bus data rate, emergency stop on an independent channel, and voice. The combined CPS-SMG system, which is contactless and maintenance-free, is functionally eqivalent to the cable festoon system and replaces it in this kind of application.

Technical details:

Automatic Tensioning Device
The CPS primary loop is a 4-conductor flat cable supported by U-shaped brackets. The cable is anchored and has a tensioning device to compensate for thermal expansion and to assure optimal positioning.

Large Runway Tolerance
The secondary pickup coil is installed on the trolley and allows for this installation a motion tolerance relative to the primary loop cable of +/- 25 mm.

Several Output Voltages
CPS provides the crane electrification commonly required several output voltages (see following diagram).


Voltage 1:   3-phase 415 VAC / 50 Hz 50 kW
 (for spreader)
Voltage 2:   1-phase 230 VAC / 50 Hz 10 kW
 (for PLC)
Voltage 3:   24 VDC 300 W
 (for SMG system)



Space Saving Installation
As shown on the illustration, CPS and SMG systems are installed side-by-side on an common support beam.

System Advantages
The economical and technical advantages of this system are impressive. Not only is the cost less than comparable motor driven festoon systems, also size and weight are significantly reduced and a cable carrier storage area and maintenance platform is no longer required. The CPS / SMG systems operate virtually noiseless, are very reliable and are not affected by acceleration or speed.