Mark V ProVis Injection System
13 - 6
Arm Light Bar Enable:
When the injector is armed, ARMLTDR alternates low then high, caus-
ing the Arm Light Bar to flash. When the handswitch is pressed to ini-
tiate the injection, ARMLTDR stays low, keeping the Arm Light Bar lit
continuously throughout the injection. When the injection is complete,
ARMLTDR will either alternate low then high (MULTI Arm), or remain
high (SINGLE Arm).
Mechanical Stop
Motor Disable
This circuit disables the Mechanical Stop motor M2 if the piston is in
the full forward position when power is applied. This prevents the
Mechanical Stop and piston plates from colliding during Self Test. The
voltage path for M2 goes through the normally-closed contacts of
relay K1 (located on the Injector Head Card), which is controlled by
U2C. U2C compares the plunger position with a set reference to ener
-
gize K1. The non-inverting input of U2C (pin 9), is fixed at +9.35 volts
by a voltage divider network (R7,R8,R9,R17), while the inverting input
(pin 8), receives the buffer plunger position voltage from U3A. When
the piston is not at full forward limit, voltage at pin 9 is greater than
that at pin 8, making the output of U2C (pin 14) positive saturation, de-
energizing K1. As the piston moves forward, voltage at pin 8
increases. When the voltage at pin 8 exceeds that at pin 9, U2C
switches to zero, making Q4 conduct, and energizing K1. The nor
-
mally-closed contacts of K1 open, breaking the Mechanical Stop
motor voltage path.
SIP Switches The injector head Display Card contains several SIP type switches for
proper set-up of the card. The switches must be set according to the
type of injector head in which the card is installed. Refer to the chart
below:
SWITCH SETTINGS
S1-1 S1-2 S1-3 S1-4 S2-1 S2-2 S2-3 S2-4
60/150 ON OFF OFF ON ON OFF OFF OFF
150/200 ON OFF ON OFF ON ON OFF OFF
S1 - 1 = 150 ml SCALE SELECTION
S1 - 2 = NOT USED
S1 - 3 = 200 ml SCALE SELECTION
S1 - 3 = NOT USED
S1 - 4 = 63 ml SCALE SELECTION
S2 - 1 = SYRINGE SELECT BAR LAMPS ON/OFF
S2 - 2 = TURRET 60 ml POSITION DISABLE/ENABLE (ON/OFF)
S2 - 3 = TURRET POSITION SENSE DISABLE/ENABLE (ON/OFF)
S2 - 4 = TURRET POSITION SENSE DISABLE/ENABLE (ON/OFF)
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