CLS200 Series User’s Guide
Chapter 2: Installation
39
NOTE!
Control outputs are SINK outputs. They are Low when the output is ON. Connect
them to
the negative side of solid state relays.
Figure 2.20
shows sample heat, cool and alarm output connections.
Cool Output
Alarm Output
+5VDC
+
-
+
-
+
-
SSR
SSR
SSR
TB50 or TB18
Heat Output
Figure 2.20
— S ample Heat, Cool and Alarm Output Connections
Heat Output
Cool Output
Alarm Output
Common
+
-
SSR
TB50 or TB18
- PS +
+
-
SSR
+
-
SSR
Figure 2.21
— Output Connections Using External Power Supply
CPU Watchdog Timer
The CPU watchdog timer constantly monitors the microprocessor. It is a sink output located on
TB50 terminal 6 or TB18 terminal 3. The output can be connected to an external circuit or device
in order to determine if the controller is powered and operational. Do not exceed 5VDC, 10mA DC)
rating for the watchdog output. The output is low (on) when the microprocessor is operating; when it
stops operating, the output goes high (off).
Figure 2.22
and
Figure 2.23
show the recommended circuit for the watchdog timer output for the
TB50 and the TB18.
SSR
+ 5VDC
Watchdog Timer
(Terminal 1)
(Terminal 6)
TB50
+
-
Figure 2.22
— TB50 Watchdog Timer Output
