150 Agilent 1200 Preparative Pump User Manual
9 Configuring the Preparative Pump
Preparative Pump Main Board (PPM)
Preparative Pump Main Board (PPM)
The board controls all information and activities of all assemblies within the
preparative pump. The operator enters parameters, changes modes and
controls the preparative pump through interfaces (CAN or RS-232C),
connected to the user-interfaces. Figure 35 on page 152 and Figure 36 on
page 153 show block diagrams of this board.
ASIC — Application-Specific Integrated Circuit
The application-specific integrated circuit (ASIC) includes all digital logic for
the core processor functions and also for module-specific functions.
Motor Drive
The drive comprises motor control and motor amplifier.
Electromechanical Proportional Valve
The EMPV consists of an electro-magnetic solenoid, driven by a PWM (Pulse
Width Modulator).
Pressure Converter
This block comprises a filter and amplifier for the pressure-sensor-signal, an
A/D converter with integrated multiplexer.
Leak Converter
This block comprises a PTC for the leak identification and a NTC for the
ambient temperature measurement. This assures that temperature changes
are not identified as leak. A leak would cool down the PTC and its change in
resistance results in a leak signal.
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