User Manual – Rev BE AMETEK Programmable Power
MX Series 190
5.3 Controller Assembly
The Controller Assembly is in the top section of the MX unit. To access this
assembly, the top cover needs to be removed. The controller assembly consists
of three printed circuit boards connected by a ribbon cable. 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.
MX Series I utilize a three board set controller. On Series II models, the
controller uses a two-board set instead (7003-718-2 or 7003-718-4 assembly).
The function of each of the boards that make up the controller module is
described in the following paragraphs.
5.3.1 CPU Controller
This board assembly, A2-A7, consists of the components for the CPU (DSP),
generating the Phase waveform signal to the power amplifier, programmable
impedance (MX30-3Pi or MX45-3Pi model only) and all the program, waveform,
and data memory. In addition, the waveform board contains the circuits for all
measurements. The clock and lock circuit required to support the clock and lock
mode of operation of multiple MX units is also on this board assembly.
On MX Series I units, this board contains only Phase A circuitry in addition to
the CPU logic. On MX Series II unit, all three phases are contained on the same
board. If the -413 option is present, a separate inter harmonic generator board
is connected to the CPU board.
5.3.2 Phase B and C Board (MX Series I only)
This assembly, A8, has the waveform, measurement and impedance
programming components for the Phase B and C power modules. This board is
not installed in an MX45-1 single-phase power system but is present for all
other configurations.
5.3.3 Keyboard / Display Board
The keyboard/display assembly is assembly A2-A9. It is mounted to the front
panel and holds the 23 rubber keys. It also has the LCD graphics display. A
shaft encoder is mounted on the board that is used as a shuttle input to allow
slewing of setup parameters. If the MX system is used over one of the remote-
control interfaces, the keyboard functions can be locked out by asserting the
REMOTE state. See the MX Series Programming Manual (P/N 9003-961) for
details.
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