Machine Control Board
7-6 CUSA EXcel Ultrasonic Surgical Aspiration System Service Manual
Cooling Pump
Cooling pump control results from the same kind of operation as irrigation and
suction pump control. The 3-bit D/A output signal range for the cooling pump is
approximately 0 to 5.1V DC. The following table shows the cooling steps:
Table 7-3.
Cooling pump voltage steps
Suction Valve
Optically isolated digital circuits control the suction valve. When current moves
through an internal LED, the output open collector transistor is saturated. The
pull-up resistors and the controlling hardware reside on the destination board.
Amplitude Control
The handpiece amplitude control circuit, a 4-bit D/A output signal range for the
handpiece control, operates from approximately 0 to 10V DC. The op amp
maximum supply voltage is 15V, so two diode drops prevent the op amp from
seeing the full 15V from the supply. The following table shows the handpiece
amplitude control steps:
Table 7-4.
Handpiece amplitude control
voltages
cool step +5v_x= 5.6v
desired voltage setpoint theoret v
10.73
21.46
default 2.208 3 2.19
42.94
53.67
64.40
max 5.152 7 5.13
amp step desired voltage D/A code theoret v
11.00
22.01
2.208 3 3.01
44.04
55.04
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