Watlow Series 988 - Manual (Page 21)

WATLOW Series 988 User’s Manual 2.11 Installation and Wiring, Chapter 2
Figure 2.11a —
Digital Event Input 1
Available on all units.
open 14-36VÎ (dc) Event Input 1 off
closed 0-3VÎ (dc) Event Input 1 on
23 24
+ -
24 23
+24V Î (dc)
10K Ω
4.99K Ω
OPTO
ISOLATOR
750 Ω
.01 µ f
4.99K Ω
Internal Circuitry
NOTE:
Successful installa-
tion requires five
steps:
• Model number and
software choice
(
Appendix );
• DIP switch set-
tings (
Chapter 1 );
• Sensor match
(
Chapter 2 and
Appendix );
• Sensor installation
(
Chapter 2 ); and
• Wiring ( Chapter 2 ).
Event Input 1 Wiring