70
Control Module The primary module in a System 450 control system, and sometimes the
only module in stand-alone control systems. Each System 450 control
system has only one control module, which contains the control system
processor, firmware, memory, and LCD. The control module receives the
input signals from the system sensors, and it monitors and controls all of
the system outputs, including the expansion module outputs. There are
four types of System 450 control modules: standard control modules,
reset control modules, hybrid analog output control modules, and
communications control modules. See C
ontrol Module and User Interface
on page 5 and Repair and Ordering Information
on page 55 for more
information.
dEP
x
In the Differential End Point (dEP
x
) screen in the Analog Output Setup
screens, select the differential value that analog output number x is
driving the controlled loop or process away from. The dEP value, along
with Differential Setpoint (dSP) value, establishes the output’s
proportional control band. The dEP screen appears in the Analog Output
Setup screens after you set up and select the Differential Sensor (Sn-d)
for the output reference. See Differential Control
on page 24 for more
information.
Differential Control The Differential Control feature is used to monitor and maintain a selected
difference in a condition (temperature, pressure, or humidity) between two
sensor points within a system, process, or space. See Differential Control
on page 24 for more information.
Direct Acting With Direct Acting proportional control, an increase in the sensor signal
results in a proportional increase of the output signal generated to the
controlled equipment and vice versa. See Direct and Reverse Control
Actions for Analog Outputs on page 18 for more information.
dSP
x
In the Differential Setpoint (dSP
x
) screen in the Analog Output Setup
screens, select the target differential value that analog output number x is
driving the controlled loop towards. The dSP value, along with Differential
End Point (dEP) establishes the output’s proportional control band. The
dSP screen appears in the Analog Output Setup screens after you select
the Differential Sensor (Sn-d) for the output reference. See Differential
Control on page 24 for more information.
EC Motor Brushless, low-radio-frequency emitting motors, available in variable-
speed (full-range modulating) motor models, multiple-speed (selectable
fixed-speeds) motor models, and models capable of being set up as either
variable or multiple speed motors. Electronically Commutated (EC)
motors are quiet, clean, energy-efficient motors that operate efficiently at
low speeds. PENN by Johnson Control EC motors provide a wide range
of models for both indoor and outdoor HVAC/R applications. The System
450 control module with hybrid analog output (C450DPW-100) is
designed to enhance and optimized EC motor operation at very low
speeds. See Sensor Failure Mode
on page 25, Hybrid Analog and High
Input Signal Selection Control System Example on page 32, and Setting
up a Pulse Region Hybrid Analog Output on page 50 for more information.
EP
x
In the End Point Selection (EP
x
) screen in the Analog Output Setup
screens, select the condition value that analog output number x is driving
the control loop away from and towards the Setpoint (SP) value. The EP
and SP values define the proportional band that the analog output is
intended to control the condition within. See Direct and Reverse Control
Actions for Analog Outputs on page 18 for more information.
TERM DEFINITION
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