System 450™ Series Control Module with Ethernet Communications Installation Instructions
20
Setting Up an Analog Output
Analog outputs provide an analog signal to control equipment in your application based on the input from a
standard fixed setpoint sensor (Sn-1, Sn-2, or Sn-3) or a High Input Signal Selection sensor (HI-2 or HI-3).
Note: The differential sensor, Sn-d, is used to set up analog and relay outputs for Differential Control. See
Differential Control
on page 15 for more information.
Analog outputs provide an auto-selecting analog signal that is proportional to the sensed input condition. The
System 450 analog output senses the impedance of the controlled equipment’s analog input circuit and
automatically delivers either a 0–10 VDC or 4–20 mA signal to the controlled equipment.
Figure 5 shows an example of the analog output setup values and the resulting output signal in a typical space
heating application (SP > EP and OSP < OEP).
The control action between the input signal and the output signal can be set up four ways, depending on the values
selected for the Setpoint (SP), End Point (EP), Percent Output Signal Strength at Setpoint (OSP), and Percent
Output Signal Strength at End Point (OEP). The LCD displays different Control Ramp icons for the four control
actions.
Edit Sensor Screen: This screen displays the sensor that this output currently references. Typically, no
action is taken in this screen. But if you need to change the sensor that this output references, you can
select a different sensor for this output in this screen.
Note: If you change the sensor that an output references to a sensor with a different Sensor Type, the
default setup values for the output change, and you must set the output up again.
10. If you do not need to change this output’s sensor, simply press to save the current sensor selection
and return to the Relay Output Setup Start screen.
To change the sensor this output references, press or to select the new sensor that this output
references. Then press to save the new sensor selection and return to the Relay ON Selection
screen (ON or dON). If the new sensor has a different Sensor Type from the previously referenced
sensor, repeat the output setup procedure for this output.
This relay output is now set up in the System 450 UI.
The screen example shows Sn-2 is selected Sensor for Output 1.
Relay Output Setup Start Screen: After you have set up this relay output, you can go to another Output
Setup Start screen, the Sensor Setup Start screen, or return to the Main screens.
11. Press to scroll through the remaining Output Setup Start screens and return to the Sensor Setup
Start screen, or press and simultaneously to return to the System 450 Main screens.
The screen example shows a Relay Output Setup Start screen for Output 1.
Table 8: System 450 Setup Screen Information and Procedures for Relay Outputs (Part 4 of 4)
LCD Screen Name, Description or Function, User Action, Example
M
System Output
Condition Value
Less Greater
65°F
10%
70°F
SP > EP
SP = 70 ( )
EP = 65 ( )
OSP = 10 (%)
OEP = 100 (%)
OSP
SP
EP
Proportional
Band
Fig:sys450_cntrl_rmp_exmpl
Figure 5: Control Ramp Example for a Typical
Heating Application (SP > EP and OSP < OEP)
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