Johnson Controls Penn System 450 Series Technical Bulletin page 81

Term
Proportional Plus
Integral (P-I)
Control
PSI
1
PULS
Relay Output
Reset Control
Modules
Definition
Incorporates a time-integral control action with proportional control action
and, if properly set up, a PI control loop can effectively eliminate offset
error and enable a controlled system to drive to setpoint even under large
constant loads. On a properly sized system with predictable loads, PI
control can maintain the controlled system very close to setpoint. See
Proportional Plus Integral Control and Integration Constants on page 23
for more information.
When a pounds per square inch (psi) pressure sensor is set up in your
control system, PSI appears in the Main (sensor status) screens, along with
the current sensed pressure value. PSI sensors include Sensor Types P 100,
P 110, P 200, P 500, and P 750. See Accessing and Navigating the User
Interface on page 42 and System 450 Sensors and Transducers for
Standard Control Modules on page 16 for more information.
Pulse Region Setup Start screen. Press
screens, which are used to optimize and enhance low-speed control of EC
motors. The Pulse Region Setup screens are only available on Analog
Output 1 on the hybrid analog output control module. Press the Menu (M)
button to go to the Output 2 Setup Start (OUTX
output (analog or relay) setup screen. You cannot select values in the Pulse
Region Setup Start screen or any other System Setup Start screen. See
Setting up a Pulse Region Hybrid Analog Output on page 55 for more
information.
System 450 provides Single-Pole, Double-Throw (SPDT) relay outputs
rated to 240 VAC. The relay outputs can be set up to provide a wide
variety of on/off control applications, including multi-stage control
applications. Relay outputs are identified in the System 450 UI as OUTR
in the Output Setup Start screens and with ON or OFF in the System Status
screens. See Relay Outputs on page 18, Setting up a Relay Output on page
47, and Viewing the System Status Screens on page 42 for more
information.
Provide Reset Setpoint (RSP) control, real-time clock, Setback scheduling
(SbK) control, and load balancing, in addition to providing many of the
features and control types provided by standard control modules. Reset
control modules include the C450RxN-x models. Reset control modules
do not control pressure applications and do not provide Differential
Control, High Input Signal Selection, or Hybrid Analog Output control.
Communication modules do not provide Reset Setpoint control, real-time
clock, Setback scheduling control, or load balancing. Refer to the
System 450 Series Reset Control Systems Technical Bulletin
(LIT-12011842) for more information.
to go to the Pulse Region Setup
2
) screen for the second
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