Power Supply Circuit

The power supply is available in two different styles. The Type S power supply has a single source input

which accepts only 24 Vdc. The Type D power supply has a dual input (redundant) which accepts both

125 Vdc and 120 Vac simultaneously. Thus, with a Type D power supply, if one of the two input voltages

should fail, the reference adjuster will remain operational by using the other input voltage. Both types of

power supplies provide all the internal operating power for the reference adjuster. Refer to the

Specifications chapter for the input power requirements.

Output Circuits

This circuit provides the necessary control resistance to the various devices that the reference adjuster

will control. Depending upon the type of application, the output will simulate a two-wire rheostat or a

three-wire potentiometer. Refer to the style charts in the Introduction chapter for values and applicability.