Campbell Scientific SDM-CD16AC 16-Channel ac/dc Relay Controller - Manual (Page 9)

SDM-CD16AC 16 Channel AC/DC Controller
The order in which connections are made is critical.
Always connect 12 V first, followed by ground, then Control
Ports. CAUTION
On a CR7, SDMs connect to the ports at the upper right corner
of the 700X Control Module. On a CR9000X, SDMs connect to
the ports on the CR9032 CPU Module, and on a CR9000, SDMs
connect to the ports on the CR9080 PAM Module. NOTE
4.1.2 Controlled Device to SDM-CD16AC Connections
ELECTROCUTION HAZARD! USE EXTREME CAUTION
WHEN WORKING WITH HIGH VOLTAGE INPUTS. DO
NOT COME IN CONTACT WITH HOT LEADS! DANGER!
Figure 3 shows how the switches in each channel operate. NO means
“normally open”, NC means “normally closed”. COM means “common” to
NO and NC.
Position of Contacts When Position of Contacts When
Coil is Energized (ON) Coil Is Not Energized (OFF)
FIGURE 3. Switch Operation
In most applications, the SDM-CD16AC acts as a switch (controllable break)
in one wire of the circuit powering the controlled device. One side of this
break may have power (hot). Figure 4 shows an example.
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