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1100 Series Nano Pump Service Manual
5
Introduction to the Nano Pump
Electromagnetical 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, a
multiplexer, an A/D converter and an offset correction for the analog pressure
output signal. The output voltage is 2 mV/bar.
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.
Fan Drive
The revolution of the fan is controlled by the main processor depending on the
internal heat distribution in the nano pump. The fan provides a PWM signal
which is proportional to the revolution. This fan status signal is used for
diagnostics.
Electronic Fuses
The valve circuits are electronically fused on the board. Any error on the
board or shortages of the valves will activate the electronic fuses that will
switch off the supply voltage. This prevents the damage of components.
Onboard Battery
An onboard lithium battery buffers the electronic memories when the nano
pump is turned off.
For safety information on lithium batteries, see “Lithium Batteries
Information” on page 265.
Interfaces
The nano pump provides the following interfaces:
•
two CAN connectors as interface to other Agilent 1100 Series modules,
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