Emerson E2 Analog Sensor Control, Cut In/Cut Out Setpoint Con Trol, Power Monitoring Input

loads.

11.11.6.1 Power Monitoring Input

The Input Type Selection parameter defines the way the Power Monitoring input (INPUT under the Inputs tab in application Setup) will be used. The parameter can be set to: KW Analog, or Pulse KWH.

Settings

When KW Analog is selected, verify the input is con- nected to a board and point that is set up with Engineering Units of KW. When Pulse KWH has been selected, verify the input is connected to a board and point that is set up with Engineering Units of KW.

11.12 Sensor Control

11.12.1 Overview

The E2 is equipped with numerous generic control modules that may be used both for simple monitoring of an analog or digital sensor and for simple Cut In/Cut Out control of a digital output. These modules are called Sen- sor Control modules.

There are two different Sensor Control Module types. Analog Sensor Control modules read the values from one or more analog sensors, compare them to a set of Cut In/Cut Out setpoints, and operate a digital output (such as a relay) based on the analog input in relation to the set- points.

Digital Sensor Control modules read the values from one or more digital sensors, combine them using a series of logical commands, and operate a digital output (such as a relay) based on the result of the logical combination.

11.12.2 Analog Sensor Control

On a basic level, an Analog Sensor Control module performs three functions:

•COMBINER: Up to four analog inputs are com- bined into a single analog value.

•CUT IN/CUT OUT CONTROL: The combined input value is compared to a Cut In/Cut Out set- point. Based on this comparison, a digital output will be turned ON or OFF.

•ALARMING: Alarms and notices can be generated based on the combined value of the inputs and its relation to a set of high and low alarm and notice setpoints.

11.12.3Cut In/Cut Out Setpoint Con-

trol

Cut In/Cut Out setpoints work differently depending upon whether the Cut In/Cut Out setpoint is higher.

Cut In Higher Than Cut Out

Figure 11-22- Cut In Setpoint Higher than Cut Out

When the Cut In setpoint is higher than the Cut Out setpoint, the Sensor Control output turns ON when the sensor input goes higher than the Cut In setpoint. The Sen- sor Control output remains ON until the input falls below the Cut Out setpoint, at which time the output turns OFF. (See Figure 11-22for an illustration).

Cut/In Lower Than Cut/Out

Figure 11-23- Cut/In Setpoint Lower Than Cut/Out

When the Cut In setpoint is lower than the Cut Out set- point, the Sensor Control output turns ON when the sensor input goes lower than the Cut In setpoint. The Sensor Con- trol output remains ON until the input rises above the Cut Out setpoint, at which time the output turns OFF. (See Figure 11-23for an illustration).

Sensor Control Software Overview • 11-39