8-106 Fresenius Medical Care 4008 4/09.03 (TM)
● Balancing chamber control (circuit diagram 4/9)
Upon each positive edge, the D-FF IC 17 is energized via the Clk-Bc signal line. At the Q./Q
outputs, D-FF IC 17 informs the GAL module IC 23, which of the balancing chamber valves is to
be activated.
The data word of IC 12 decides upon the PRG type of valve switching.
Data word IC 12
Flow “off” 0000 0011
Hemodialysis operation 0000 0010
Prime program 0000 1010
Emptying program 0001 0010
Switching to single-valve control is possible via the FBKU signal line (the respective balancing
chamber valve is controlled by the data word of IC 12).
● ASP control (air separating pump) (circuit diagram 5/9)
UF pump control:
At pin 4, the monoflop IC 42 is triggered by H level from IC 4, pin 14, via IC 39, pins 1 and 3. Via
the power transistor T8, the output of IC 42, pin 6, controls the UF pump 1, with the starting time
being determined by the RC element R82 and C47.
At pin 12, the monoflop IC 42 is triggered by H level from IC 4, pin 13, via IC 39, pins 4 and 6. Via
the power transistor T3, the output of IC 42, pin 10, controls the UF pump 2, with the starting time
being determined by the RC element R65 and C45.
The UF pumps can also be activated by CPU 2 via the UF-P-CTRL and UF_P2_CTRL signal
lines.
● Digital control outputs (circuit diagram 6/9)
Via the open collector drivers IC 34, IC 21, and IC 20, or via level converters IC 41, the respective
signal lines are controlled by the data residing at latch IC 13, IC 11, and IC 6.
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