Chicago Dryer King Edge VAc, Инструкция по эксплуатации

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King Edge Vac Repair
7-43
General Photosensor Sensitivity
Adjustment
The correct sensitivity for a sensor depends
on its location. Some sensors have slightly
reduced sensitivity to eliminate false triggering
by background objects.
There are two parts to adjusting the sensitivity
of a photosensor:
The first is to adjust the sensitivity so
that the green LED glows bright and
steady. In the case of retroreflective
sensors, both the green and red LEDs
will glow.
The second is to either, as appropriate,
turn on or turn off the red LED while
checking the control system input cards
to make sure the communications signal
is being received.
NOTE: This procedure is best
performed by two workers. The
“buddy system” is the safest
system.
•
•
Required Tools
thin slotted screwdriver.
Perform only when the unit is OFF
with power connected.
Use extreme caution.
Turn power ON at the main disconnect
switch.
Press the green START button.
Press any of the red safety STOP but-
tons.
CAUTION
The sensitivity potentiometer
on photosensors is a
precision electronic device.
Forcing it beyond its range
and/or using too large a
screwdriver may ruin it.
Use the proper size screwdriver to fit the
slot in the potentiometer (Figure 7-56,
A). Note that there is a different slot for
switching between LO and DO (B). Do
not change this setting.
With no material in view, turn the potenti-
ometer clockwise until the green LED on
the photosensor lights bright and steady
(both green and red LEDs in the case of
retroreflective photosensors).
A bright LED means a stable signal.
A dim or flickering LED means a non-
stable signal.
Open the left endframe door and posi-
tion a worker at the control system input
boards.
Manually trigger the photosensor so that,
as appropriate, either the red LED lights
or goes out.
1.
2.
3.
4.
5.
•
•
6.
7.
Figure 7-56: Photosensor sensitivity is adjusted
using the potentiometer.
A
B
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