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区 JALLINCKRODT
LAMP INTERFACE
The enabled and injecting lamp are powered by the power pack.
The powerhead board simply passes the control signals from the
powerhead connector to the lamp connector J4.
MOTOR INTERFACE
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The motor power is passed through a normally open relay, K1,
before being connected to the motor via J5. When open, the relay
shorts the two motor leads together providing dynamic braking of
the motor. When closed, the relay simply passes the two motor
lines supplied by the Power Pack to the motor.
K1 is energized by
the microcontroller whenever the motor should move.
A snubber
circuit, SN1, is connected across the motor leads for noise sup-
pression.
STATUS LEDS
There are five status LEDs used on the powerhead.
The meaning
of each is shown below:
Table 3-13. Status LED's
LED#
Description
ON
OFF
+5 VDC
+5 VDC
[ov
3
Not used
-
-
4
Heater PWM
Heat
No Heat
Not Used
-
6
Motor Encoder Direction
Expel
Fill
800961-C
Nov.
2000
3-43
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