SDM-CD16AC 16 Channel AC/DC Controller

TABLE 1. Datalogger to SDM-CD16AC Connections

Connection

 

 

 

Order

SDM-CD16AC

Datalogger (see note)

Function

First

12 V

12 V on datalogger or

Power

 

 

external supply

 

Second

Gnd

Gnd

Common ground

 

C1

SDM-C1 (CR3000,

Data

 

 

CR5000) or C1 (other

 

 

 

dataloggers)

 

 

C2

SDM-C2 (CR3000,

Clock

 

 

CR5000) or C2 (other

 

 

 

dataloggers)

 

 

C3

SDM-C3 (CR3000,

Enable

 

 

CR5000) or C3 (other

 

 

 

dataloggers)

 

NOTE

4. Installation

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.

If the 21X power supply is used to power the SDM-CD16AC, all low level analog measurements (thermocouples, pyranometers, thermopiles, etc.) must be made differentially. This is a result of slight ground potentials created along the 21X analog terminal strip when the 12 V supply is used to power peripherals. This limitation reduces the number of available analog input channels and may mandate an external supply for the SDM-CD16AC.

•The SDM-CD16AC must be installed in an enclosure that provides a pollution degree 2 environment (normally, only nonconductive pollution. However, a temporary conductivity caused by condensation may be expected). All Campbell Scientific enclosures meet this requirement.

•Use copper conductors only.

•Wire Range: 30 − 14 AWG

•Tightening Torque: 5 − 7 in./lb.

•Use minimum 60/75 degree C wire.

•Input power must be connected to a class 2 supply only. All Campbell Scientific power supplies meet the class 2 supply requirements.

CAUTION The order in which connections are made is critical. Always connect 12 V first, followed by ground, then Control Ports.

4