Mark V Provis Injection System
11 - 2
U3 is at negative saturation), the Mechanical Stop will move toward
the front of the injector head (when the injection is complete).
Triangular Ramp
Generator
A triangular waveform is generated on the U2D non-inverting input.
Overcurrent
Shutdown Circuit
If excessive current flows through sampling resistor R32, the voltage
developed activates Q5 and Q6, triggering one-shot U1, and disabling
ramp generator U2D.
Switched -26 VDC
A pair of normally-closed contacts on the Safe Relay complete the
path for -26 VDC to the Mechanical Stop Drive Card, which enables
the motor to run while the injector is disarmed. When the injector is
armed and the system has determined that the Mechanical Stop is in
position, the Safe Relay is energized and the contacts are opened to
the MSD Card, removing -26 VDC, which disables the motor.
Injector Head
Indicators
The armed light (L1) on the head is controlled by Q1. Syringe size
indicators are controlled by Q2 and Q3. Control signals for these indi-
cators originate at the 150/200 Enable on the I/O Card.
Figure 11.1: Block Diagram: Mechanical Stop Drive Card
Содержание ProVis Mark V
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Страница 60: ...Injector Head 13 7 Figure 13 1 Block Diagram Head Card...
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Страница 64: ...Imaging System Interface 14 3 Figure 14 1 Connector Locations...
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