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MANUALLY TUNING A THREE MODE (PID) CONTROLLER
TUNING THE OUTPUTS FOR HEATING CONTROL-cont. - TM-5-3895-374-24-2_466

TM-5-3895-374-24-2 M081 Asphalt Mixing Plant Manual
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TM 5-3895-374-24-2 955-257 f) Press PARAM DISPLAY key and sequentially enter the following values: PR BAND 1 ---------------------5%: (PB) RESET 1  ------------------------0 R/M (Turns off Reset Function) RATE 1  --------------------------0 MIN (Turns off Rate Function) Also set all Secondary tuning values to 0. NOTE: The procedure used in this section is for a "HEATING" output.  A similar procedure may be used for a "COOLING" output. TUNING THE OUTPUTS FOR HEATING CONTROL The tuning procedure is easier to follow if you use a recorder to monitor the process temperature. 1) Press the RETURN key (see THE POINTERS Section 4.6) so that the measurement appears on the screen.  It is not necessary to return to OPERATOR mode while tuning the controller. Press Start key (Models 2000, 2001 and 2003) or AUTO key (Models 2002 and 2004) to enable the OUTPUTS(s) and start the process.  The "MAN" indicator must be OFF. 2) The process should be run at a setpoint that will allow the temperature to stabilize with heat input required. 3) With  RATE  and  RESET  turned  OFF,  the  temperature  will  stabilize  with  a  steady  deviation,  or  droop,  between  the setpoint  and  the  actual  temperature.    Carefully  note  whether  or  not  there  are  regular  cycles  or  oscillations  in  this temperature by observing the measurement on the display.  (An oscillation may be as long as 30 minutes). 4) If there are no regular oscillations in the temperature, divide the PB by 2. Allow the process to stabilize and check for temperature oscillations.  If there are still no oscillations, divide the PB by 2 again.  Repeat until cycles or oscillations are obtained.  Proceed to step 5.  If oscillations are observed immediately, multiply the PB by 2.  Observe the resulting temperature for several minutes.  If the oscillations continue, keep doubling the PB until the oscillations stop. ECLIPSE INSTRUMENTATION DIVISION page 3-1099







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