Emerson Vission Guía para resolver problemas descargar pdf (Pagina 30)

These screens enable the operator to view and

adjust settings that affect compressor control.

From the Setup screen, the operator can choose

the method or mode of compressor control:

Compressor Control Via

Suction Pressure

Process Temperature

Discharge Pressure

Once the method is chosen, the appropriate

setpoints are then displayed on the Compres-

sor Control Setpoints screen.

The compressor will decide when to increase

or decrease capacity by comparing the con-

trolled variable to the setpoints. The maxi-

mum on time and minimum off time settings

for slide actuator motors can be used to reduce

hunting or improve response time. The de-

fault settings of 3 and 20 seconds respectively, pro-

vide good operation over a wide range of condi-

tions.

Also on this screen, the following buttons are dis-

played:

· Event List – Provides a chronological event list-

ing.

· Chart – Provides a line graph showing process

values over a range of time.

· Auto – Places the capacity slides into automatic

mode. In automatic mode, the capacity slide

moves according to control setpoint informa-

tion.

· Manual – Places the capacity slides into manual

mode. In manual mode, the capacity slide

moves based on input from the operator.

Compressor Control

Level 1 Access – Compressor Control Setpoints

From the Menu screen , press the Compressor Control setpoints button. The compressor control setpoints screen

will be shown.

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Emerson Vission Guía para resolver problemas Pagina 30