Section 6 • Compressor Control

As mentioned in the above paragraph, the distance of the process variable from the control setpoint deter- mines the size of the pulse used to move the capacity slide. This is called the proportional band and is set by the Proportional Setpoint. When the process variable is outside the proportional band, the slide will move in the direction of the error continuously. Increasing the size of the proportional band can help slow the compres- sors reaction by varying loads if desired, see Figure 6-2. Proportional Band & Setpoint.

The Dead Band Setpoint defines area around the control setpoint where the algorithm stops adjusting the capac- ity slide. This area is a percentage of the proportional band. By default the proportional band is set to 4 Psig and the dead band is set to 10% of 4 Psig. Making the dead band +/- 0.4 Psig of the control setpoint. Once the process variable is within the dead band, the algorithm considers the compressor to be on setpoint. If the op- erator wishes the compressor to operate closer, the set- point can be set to a smaller percentage. However this

will result in the capacity slide excessively moving to maintain the setpoint and could over heat the actuator or shorten the actuators operational life.

Auto-Cycle

The auto-cycle setpoints define the control points in which the compressor will automatically cycle on and off when the compressor has been placed into “Auto” run mode. These setpoints can be “enabled” or “disabled” using the check box. A delay can be entered to momen- tarily delay the start or stop from immediately occurring when the setpoint is met. If a compressor shutdown is desired on a suction pressure drop and a manual reset is required, set the OFF value below the Low Suction Pressure safety trip value. This will shut down the com- pressor and a Reset will be required to restart it.

Figure 6-2. Proportional Band & Setpoint

6 – 2

Vission 20/20 • Operation and Service Manual •Vilter/Emerson • 35391SC 1.8.5153

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Emerson 20/20 service manual Auto-Cycle, Proportional Band & Setpoint

20/20 specifications

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