Johnson Controls System 450 Series Installation Instructions And Operators Manual page 23

Table 10: System 450 Setup Screen Information and Procedures for Analog Output (Part 2 of 4)
LCD Screen Name, Description or Function, User Action, Example
When an analog output references Sn-1, Sn-2, Sn-3, HI-2, or HI-3, the Standard Setpoint Selection
screen appears.
Setpoint Selection Screen: Setpoint is the target value that the controlled system drives towards and
along with End Point, defines this output's proportional band.
Note: An output's minimum proportional band (between Setpoint and End Point) is automatically
Or
enforced in the output's Setpoint and End Point Selection screens.
3. Press
go to the End Point Selection screen.
The screen example shows a Setpoint value of 225 (psi) selected for Output 3.
When an analog output references Sn-d, the Differential Setpoint Selection screen appears.
Differential Setpoint Selection Screen: Differential Setpoint (dSP) is the target value that the controlled
system drives towards and along with Differential End Point (dEP), defines this output's proportional band.
The dSP value is a differential value that represents a (selected) difference in the condition (temperature,
pressure, or humidity) between Sn-1 and Sn-2 (Sn-1 minus Sn-2). Depending on the intended
proportional control action and the physical location of Sn-1 and Sn-2 sensors in the condition process,
dSP may be a positive or negative value.
Note: The unit of measurement, resolution increment, minimum proportional band, and range of usable
values for dSP and dEP are determined by the Sensor Type selected for Sn-1 and Sn-2. (See Table 4 and
Table 7 for more information.) The output's minimum proportional band (between dSP and dEP) is
automatically enforced in the output's Setpoint and End Point Selection screens.
3. Press
Setpoint value selection and go to the End Point Selection screen.
The screen example shows a dSP value of 30 (psi) selected for Output 3.
When the output references Sn-1, Sn-2, Sn-3, HI-2, or HI-3, the Standard End Point Selection screen
appears.
End Point Selection Screen: End Point is the value that the controlled system drives away from (towards
Setpoint) and, along with Setpoint, defines this output's proportional band.
Note: An output's minimum proportional band (between Setpoint and End Point) is automatically
Or
enforced in the output's Setpoint and End Point Selection screens.
4. Press
and go to the %Output Signal Strength at Setpoint Selection screen.
The screen example shows an End Point value of 250 (psi) selected for Output 3.
When the Output references Sn-d, the Differential End Point Selection screen appears.
Differential End Point Selection Screen: Differential End Point (dEP) is the target value that the
controlled system drives away from (towards Differential Setpoint) and along with Differential Setpoint
(dSP), defines this output's proportional band. The dEP value is a differential value that represents a
(selected) difference in the condition (temperature, pressure, or humidity) between Sn-1 and Sn-2 (Sn-1
minus Sn-2). Depending on the intended proportional control action and the physical location of Sn-1 and
Sn-2 sensors in the condition process, dEP may be a positive or negative value.
Note: The unit of measurement, resolution increment, minimum proportional band, and range of usable
values for dSP and dEP are determined by the Sensor Type selected for Sn-1 and Sn-2. (See Table 4 and
Table 7 for more information.) The output's minimum proportional band (between dSP and dEP) is
automatically enforced in the output's Setpoint and End Point Selection screens.
4. Press
Point value selection and go to the %Output Signal Strength at Setpoint Selection screen.
The screen example shows a dEP value of 25 (psi) selected for Output 3.
Output Signal Strength at Setpoint Selection Screen: Select the strength of the signal that this output
generates when the sensed condition is at the Setpoint value. The signal strength range is 0 to 100 (%).
5. Press
save your selection and go to the %Output Signal Strength at End Point Selection screen.
The screen example shows an OSP value of 10 (%) selected for Output 3. Therefore Output 3 generates
10% of the total signal strength (1 V or 5.6 mA) when the input is at the Setpoint value of 200 (psi).
System 450™ Series Control Module with Ethernet Communications Installation Instructions
or to select this output's Setpoint value. Press
or to select this output's Differential Setpoint value. Press
or to select this output's End Point value. Press
or to select this output's Differential End Point value. Press
or to select this output's %Output Signal Strength at Setpoint (OSP) value. Press
to save your Setpoint value selection and
to save your End Point value selection
23
to save your Differential
to save your Differential End
to