User Manual – Rev B
FCS Series II
5. Principle of Operation
5.1 Overall Description
Input power from the rear panel is routed through an EMI filter, the circuit breaker, and to th
input transformer, T1. The input transformer provides three isolated six phase supplies each of
which are rectified to supply 300 VDC for the power amplifiers. A low power three-phase
secondary provides isolated AC power to drive the oscillator and current limit boards and the
two fans on the low
e
er front panel of the cabinet.
The power amplifiers, A3, A4, A5, provide high power AC outputs using DC power from the 300
from the oscillator assembly.
5.2 Controller Assembly
The oscillator assembly, A2, generates the oscillator waveforms and power source control and
measurement signals. The oscillator assembly plugs into the motherboard, A6, through the
cabinet front panel.
The current limit assembly, A1, provides the programmable current limit function.
The motherboard, A6, makes the interconnections between the oscillator, current limit board,
power amplifiers, output sense and system interface.
volt bus, and signal reference
One line of each of the outputs is routed through current transformers on A7, the current
transformer assembly; this is the means of measuring output current. Voltage sense is also
received from the sense terminal block and directed to the motherboard.
The assemblies are described in more detail in the following paragraphs.
The Controller Assembly is located on the front panel of the master unit behind the
keyboard/display. The controller assembly consists of a single printed circuit board that plugs
into the backplane motherboard. The controller contains the main oscillator, which generates
the sine wave signal setting the frequency, amplitude and current limit level. It also senses the
output voltage to provide closed loop control of the output. The controller also handles all user
interface and remote control related tasks. The function of the controller module is described in
the following paragraphs.
5.2.1 Programmable Controller
This board assembly, A7, consists of the components for the CPU (DSP), generating all three
Phase waveform signals to the power amplifier and all of the program, waveform and data
memory. In addition, this board contains the circuits for all measurements. The clock and lock
circuit required to support the clock and lock mode of operation of multiple units is also on this
board assembly.
5.2.2 Keyboard / Display Board
The keyboard/display assembly is assembly A9 and is mounted to the front panel. If the power
system is used over one of the remote control interfaces, the keyboard functions can be locked
out by asserting the REMOTE state. See the Lx/Ls Series Programming Manual (P/N 7004-981)
for details.
California Instruments
88
Summary of Contents for FCS Series II
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