Watlow Electric Micro-Based Autotuning Control SERIES 980/985 - Manual (Page 16)

Output 1 Option “B”, Solid State Relay
Figure 14 -
Solid State Relay,
Output 1, Option “B”
Wiring Diagram.
Figure 15 -
DC Output 1 (Open
Collector), Option
72” Wiring Diagram.
ModeI# 98_A-_ B _0-0000
Solid
State
Relay
Solid State Relay
Watlow's solid state relays change state at zero volts, which is *zero-cross switching.”
They are also optically isolated, which means the output circuitry is energized by
infrared light striking a photo-sensitive device. This results in virtual absence of electri-
cally generated noise, pIus output to input electrical isolation. Off state impedance is
2 O K o h m minimum.
Output 1 Option “C”, DC Output (Open Collector)
Model# 98_A-_C_0-0000
+
,
.
3
DCLoad
Switched DC
Watlow’s solid state switch is a low current DC output (open collector) used to switch an
external power switching device such as an SSR or an electromechanical relay. The
input specifications of the power switching device must those listed for the SS
switch output. The power switching device must provide isolation between the SS
switch output and load power since the SS switch output is a non-isolated output.
Minimum load resistance is 5 O O o h m s.
Available current is minimum 9mA, 22mA maximum.
16
WATLOW Series 980/985 User’s Manual Install and Wire, Chapter 2