Watlow CAS200 - Manual (Page 43)

CAS200 User’s Guide Chapter 2: Installation
Watlow Anafaze 31
Figure 2.16 Wiring Digital Outputs
Alarm Output Connections
Typical alarm outputs use external optically isolated solid-
state relays (SSRs). The SSRs use a 3 to 32Vdc input for
control, and you can size them to switch up to 100A at
480Vac. For larger currents, you can use SCR power
controls or optically isolated SSRs to drive contactors.
NOTE! Alarm outputs are SINK outputs. They are Low
when the output is On. Connect them to the nega-
tive side of Solid State Relays.
The figure below shows sample alarm output connections.
Figure 2.17 Wiring Alarm Output Connections
Digital Output 1
Digital Output 2
TB50
Control Common
+5Vdc
Load
Digital Output 1
Digital Output 2
Using Internal Power Supply
Using External Power Supply
Do not connect to earth
ground or equipment ground
External
Power Supply
+
-
Alarm Output 1
Alarm Output 2
Alarm Output 3
+5Vdc
+ - + - + -
SSR SSR SSR
TB50