Operating instructions
Current Sinking (NPN)
Requirements
IIIII
A
k
II
Ill
-
1
t
2
3
I
4
~
""
~
I
Installation 3-15
A current sinking (NPN) device capable
of
sinking at least 10 rnA must
be
used to stimulate the signal inputs.
The
internal circuitry for the
Nordson photosensor is pre-wired to include the required NPN
switching element. Figure
3.
10
shows
the
wiring diagram for the
Nordson photosensor.
B
- 8
!
*
~
7
T
Figu
re
3.
10
- Nordson photosensor wiring diagram
(wired as a sinking device)
A
-Photosensor
1-
+12VDC
2-Signal
3-Ground
4
-Shield
5-
Sw
itching element (NPN transistor), pre-wired within sensor circuitry
6 - Pigtail wire for shield
B - PC40
7-
To
logic circuit
8 - +12V
Tips
for
Minimizing Unwanted
Triggering
C
NOI'clson
Corpotabon 1993
AI Aoghts Aeser.red
The
occure
nc
e
of
unwanted trigger signals can
be
reduced
by
following
these recommendat
io
ns:
• Avoid routing sensor wires near
AC
power lines, solenoid output
lines,
or
other electrical devices (i.e., motors, contactors, relays,
etc.) that
may
cause electrical interference. Especially avoid
routing wires in troughs
or
conduits with other high
current-carrying conductors.
• Make sure that no objects other than the substrate pass between
the sensor and substrate during line operation.
• Mount the sensors within the recommended distance range
of
the
substrate.
P/N 108 389A
57
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