DRN3.1 - The DRN3.1 is an interface that allows microprocessor control of a variable resistance. The DRN3.1's isolated resistor network can be controlled by several different DDC signal types. It directly replaces a variable resistance controller and simulates the action of a slide wire or rotary potentiometer. All connections of the simulated potentiomete the wiper and both ends of the resistance rang are available on the DRN3.1terminal strip.  The DRN3.1 accepts an ANALO PULS or FLOATING POINT input signal (including triac) and converts it into a proportional resistive output. The output resistance does not wrap around if the input signal exceeds the highest or lowest selected input value.  The DRN3.1 has on-board fail-back relays that lock out the original resistive signal during operation.  Howeve if the supply power is los control of the circuit will revert back to the original controller signal.  An easy local override can be made by placing a fixed (or variable) resistor between W and R Fail-safe terminals.  The DRN3.1 is covered by ACI's Two (2) Year Limited Warranty. Electronic potentiomete Electric Actuator control

DRN4 - The DRN4 is a resistive output motor actuator interface that accepts several types of DDC system signals. The DRN4 output is 0 to 135 ohms. The input signal types are field selectable by an 8-position DIP switch.  The floating point input accepts two digital signal one for increase and the other for decrease.  The floating point full scale rate of change is 55 seconds.  Some triac input signals require an accessory.  The DRN4 is supplied in an enclosure that can be directly mounted to a 1/2" knockout on the motor acuator.  Color coded wire leads with spade connectors are provided for electrical connections.  The DRN4 is covered by ACI's Two (2) Year Limited Warranty. Resistive sensor simulatio Electronic potentiomete Electric Actuator control