Principles of Operation

David L. Huffman

Reference the block diagram for details listed in this operation guide.

block.jpg (90K)

The CETEC supply is operated from a 208 VAC 20 Amp 3-phase outlet. Each phase of the input power is used as a single phase input to each commercial power supply unit and for the control power brick. The control power is ON whenever the AC input is connected to a live outlet. The commercial power supplies have their AC input controlled by a solid state relay that needs an External Interlock permit and On/Off signal from the monitor board.

Each output voltage has a shunt for measuring the load current and remote sensing is used to eliminate the shunt voltage drop. Output voltage is measured at the connection points where the wiring harness is attached. A front panel display provides visual feedback of the supply conditions as well as toggle switches for controlling the unit.