DE-3000 IOI 7-17
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48
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INHIBIT AN OUTPUT DECREASE
The output of one or more of the control loops can be limited in the decreasing
direction only, while allowing the assigned output to freely increase.
•
FORCE AN OUTPUT INCREASE
The output of one or more of the control loops can be forced to increase even
if the primary control loop requires a different action.
•
FORCE AN OUTPUT DECREASE
The output of one or more of the control loops can be forced to decrease even
if the primary control loop requires a different action.
In addition to these actions being assignable to the analog inputs, they are also
assignable to the analog outputs (AO1, AO2). This allows for the output of one
control loop to interact with the other according to a programmed priority. For
example, the output of loop #2 can be inhibited until a certain output value of
Loop #1 is reached.
In addition to defining the input/output relationship, the relationship of the con-
trol output value to the actuator must also be defined as either direct or inverse
acting. As in the case of the control input/output relationship, the direct act-
ing output mechanism is one where an increase in current from the controller
causes an increase in load on the compressor. An inverse operating actuator is
one where the current is decreased to increase the load on the compressor.
26.0
CALIBRATION OF TRANSDUCERS
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Connect the computer cable from the computer to the DB9 port #1 on the
back of DE-3000 display module.
•
Using the DE-3000 software resident on the CDROM, open the DE-3000
program. Then click on the CALIBRATE button at the top of the screen.
•
Select the number of channel to be calibrated.
•
The sensor selection box will show either the default value or the past cali-
brated value depending the firmware version of the DE-3000.
•
Under the CALIBRATION SETPOINT section is a box that reads CURRENT
DATA. This is the actual information being displayed on the DE-3000 Display.
•
On the Terminal Board connect a voltmeter between the (+) and (-) transducer
output terminals for the channel being calibrated.
•
Apply the desired minimum pressure or temperature to the transducer being
calibrated. Next take note of the voltage being measured on the voltmeter, this
voltage is to be entered in the LOW SENSOR VOLTAGE box. Then click the
ACCEPT key to enter the new low value.
•
Increase the pressure or temperature to the desired high reading of the trans-
ducer being calibrated. Again take note of the voltage being measured and en-
ter the measured voltage in the HIGH SENSOR VOLTAGE box and hit accept.
Calibration of that channel is complete.
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