TM 5-3895-374-24-2955-25710) 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.5ToOr use Nomogram II below:NOMOGRAM IIEnter this value for RESET 1.11) Again using the oscillation time measured in Step 7, calculate the value for RATE in minutes as follows:ToRATE = To : Where To-Oscillation Time in Minutes10Or use Nomogram III below and enter this value for RATE 1.TEMPERATURE CYCLE TIME IN MINUTESNOMOGRAM III12) If overshoot occurred, it can be eliminated by decreasing the RESET time. When changes are made in the RESETvalue, a corresponding change should also be made in the RATE adjustment so that the RATE value is equal to:RATE =1i.e., If reset = 2 R/M then6 X Reset ValueRate equals 0.08 Min.13) Several setpoint changes and consequent RESET and RATE time adjustments may be required to obtain the properbalance between "RESPONSE TIME" to a system upset and "SETTLING TIME". In general, fast response isaccompanied by larger overshoot and consequently shorter time for the process to "SETTLE OUT". Conversely, it theresponse is slower, the process tends to slide into the final value with little or no overshoot. The requirements of thesystem dictate which action is desired.14) When satisfactory tuning has been achieved, the cycle time should be increased to save contactor life (applies to unitswith time proportioning outputs only TPR). Increase the cycle time as much as possible without causing oscillations inthe measurement due to load cycling.ECLIPSE INSTRUMENTATION DIVISIONpage 3-1101
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