baxter Flo-Gard 6301, Service Manual, Page: 189 / 252

07-19-B1-729 FLO-GARD 6301 DUAL CHANNEL VOLUMETRIC INFUSION PUMP SERVICE MANUAL
12-1
Chapter 12
Chapter 12
Theory of Operation
Overview
This chapter covers the operating principles of the device. The theory of
operation does not cover the specific circuitry in great detail, but provides
general information needed to perform fault isolation. Active-low signals on
all schematic diagrams in Chapter 13, “Diagrams” are denoted by an
exclamation point (!) preceding the signal name.
CPU System
CPUs
See Figure 13-9 through Figure 13-16. The pump uses two identical CPUs,
U101 and U001. U101 always functions as the master CPU and U001 always
functions as the slave.
The master CPU controls all pump functions except motor control, which is
handled by the slave CPU. The master CPU sends rate information and motor
start/stop messages to the slave CPU and also monitors the motor control by
the slave CPU.
The master CPU gathers data from and/or controls the interlock switches, the
power control circuit, the communication controller, two I/O controllers, the
occlusion detection multiplexer, the RAM, the real time clock, the air sensor,
the universal pulse processor and the alarm control circuit.
The master CPU also handles RS-232 serial communication with an external
computer through the communication controller.
The slave CPU controls the pump motors via the motor control circuit in three
ways:
Q
Generates pulses to rotate the motors.