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TUNING THE OUTPUTS FOR HEATING CONTROL-cont. - TM-5-3895-374-24-2_466
SIMPLIFIED MANUAL TUNING PROCEDURE FOR PID CONTROLLERS

TM-5-3895-374-24-2 M081 Asphalt Mixing Plant Manual
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TM 5-3895-374-24-2 955-257 10)  Using the oscillation time measured in Step 7, calculate the value for RESET in repeats per minutes as follows: RESET = 8 X 1 ; Where To = Oscillation Time in Minutes. 5 To Or use Nomogram II below: NOMOGRAM II Enter this value for RESET 1. 11)  Again using the oscillation time measured in Step 7, calculate the value for RATE in minutes as follows: To RATE = To : Where To-Oscillation Time in Minutes 10 Or use Nomogram III below and enter this value for RATE 1. TEMPERATURE CYCLE TIME IN MINUTES NOMOGRAM III 12)  If overshoot occurred, it can be eliminated by decreasing the RESET time.  When changes are made in the RESET value, a corresponding change should also be made in the RATE adjustment so that the RATE value is equal to: RATE =               1             i.e., If reset = 2 R/M then 6 X Reset Value Rate equals 0.08 Min. 13)  Several setpoint changes and consequent RESET and RATE time adjustments may be required to obtain the proper balance  between  "RESPONSE  TIME"  to  a  system  upset  and  "SETTLING  TIME".    In  general,  fast  response  is accompanied by larger overshoot and consequently shorter time for the process to "SETTLE OUT".  Conversely, it the response is slower, the process tends to slide into the final value with little or no overshoot.  The requirements of the system dictate which action is desired. 14)  When satisfactory tuning has been achieved, the cycle time should be increased to save contactor life (applies to units with time proportioning outputs only TPR).  Increase the cycle time as much as possible without causing oscillations in the measurement due to load cycling. ECLIPSE INSTRUMENTATION DIVISION page 3-1101







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