User Manual – Rev BE AMETEK Programmable Power
MX Series 196
5.4 System Interface Board
The System Interface Board is in the top section of the MX unit. To access this
assembly, the top cover needs to be removed. The System Interface board, A6,
receives the oscillator signal from the CPU controller assembly for all phases and
passes it through to all three amplifiers whose gains are controlled by a signal
from the over current circuit. The over current circuit senses the RMS value of
the current. If the load current exceeds the programmed value, the output of
this sensing circuit reduces the amplitude of the oscillator drive signal. The
output of the unit then becomes a constant current output, with the output
voltage dropping as the load increases.
The System interface also monitors a variety of status signals from the
amplifiers. This includes PFC good, over temperature signals and DC bus
regulation good signals. If any status signal is false, the system interface board
will shut down the MX. At power on, all status signals must return good (TRUE)
or the MX system power up sequence will be halted.
Finally, the System interface assembly also routes the required system interface
bus signals between multiple MX45 chassis for multi-box configurations (MX60,
MX90 and MX135). A DB-37 to DB-37 system interface cable is used to connect
two or more MX units in a multi-box configuration. Each MX30 or MX45 provides
two sets of system interface connectors on the rear-panel. One is the master
out (unit with CPU controller assembly installed), the other the Auxiliary in.
((unit without CPU controller or with CPU controller disabled.) The CPU
controller can be disabled using the internal DIP switch located on the GPIB /
RS232C / IO assembly. (Requires removal of the top cover).
5.5 Current / Voltage Sensor Board
The current and voltage sensor board, A4, senses the output current and
voltage of all three amplifiers and feeds this information back to the system
interface board. These same signals are also used by the controller for all
measurement functions. Voltage sense is accomplished either internally or
externally. For best voltage regulation at the EUT, external sense connections
should be made using the External Sense terminal block located at the top of
the back-panel.
Alternatively, internal sense mode may be selected. In this case, the voltage is
sensed at the sensor board.
5.6 Low Voltage Power Supply
The Low Voltage power supply is mounted behind the system interface board in
the top section of the MX chassis. This assembly generates all required low
voltage DC outputs. These outputs from the LV Power supply provide analog
and logic power to all the modules.
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