User Manual – Rev AV AMETEK Programmable Power
MX Series 152
5.3 Controller Assembly
The Controller Assembly is located 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 models use 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 of 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.
5.3.4 GPIB / RS232 or GPIB / RS232 / USB / LAN IO Board
This board assembly is identified as A1. It has the IEEE 488, RS232 and USB transceivers and
optionally an Ethernet interface (-LAN option). USB and LAN are available on top assembly
7003-427 MX models only. It also has isolators to provide safety isolation for both interfaces and
additional user accessible I/O lines. Additional user accessible inputs and outputs available
through this assembly are:
x Trigger Input BNC
x Trigger Output BNC
x Function Strobe BNC
x Remote Inhibit (terminal strip)
x External Sync (terminal strip)
x Clock BNC (option)
x Lock BNC (option)
x Output Status (Available on top assembly 7003-427 only.)
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