TM 5-3895-374-24-2 4.3 TUNING For actual tuning, proceed by pushing the PARAM DISPLAY key. At this display, you must decide if you want to tune the controller or TUNE ? return to the OPERATOR loop.  Tuning is required on all initial OUTPUTS installations.  If the NO key is pressed, the display goes to the "END OF TUNE" display.  If the YES key is pressed, the following displays appear in sequence. DEAD BDI For an ON/OFF primary output ONLY, select a DEADBAND of 0.25, 0.50, or X.XX% 1.00% of Span using the arrow keys.  Factory preset at 0.25% of Span. Push the PARAM DISPLAY key to advance. This display appears ONLY when the primary output is set for Time CYCTIME1 Proportional Control (TPR).  Set a cycle time (CYCTIME) from 1 to 60 XX SEC seconds using the arrow keys-factory preset at 15 seconds.  Push PARAM DISPLAY key to advance. The next display will vary depending on the controller model.  Controllers without self tuning (Models 2000, 2001 and 2002) follow  the  manual  tuning  procedure  in  Section  4.5.    Controllers  with  self  tuning  (Models  2003  and  2004)  follow  the procedure in Section 4.4 below.  All controllers with a secondary output must have the secondary output tuned manually. 4.4 SELF TUNE PROGRAM (Models 2003 and 2004 only) SELF? 6 This is the first display in the SELF TUNE program.  Push the YES key for TUNE? SELF TUNE.  Push the NO key if manual tuning of the primary output is desired and proceed to Section 4.5. You must next choose the desired closed  loop  response  of  the  system:  FAST  or  SLOW.    Different  tuning  rules  are applied by SELF TUNE according to your choice. FAST ? NO SLOW ? Indicate whether you want your system to be a FAST or RESPONSE RESPONSE SLOW responding system.  Push the NO key to switch between these two displays.  Push the YES key to select YES YES the desired response. Select FAST RESPONSE for systems where a possible overshoot will not present a hazard.  Select SLOW RESPONSE where potential overshoot is not acceptable.  Your decision can be changed at any later time without retuning by returning to these displays in the TUNE loop and selecting the other response. Push the NO key if you don’t want to start the SELF TUNE procedure.  The START PID constants will then be calculated according to the last process model TUNE ? and your choice of response.  This allows you to change your choice of FAST or SLOW tuning without repeating the self tuning program. Push the YES key to initiate the SELF TUNE program. SELF The yellow TUN light will flash, and the display indicates that you are TUNING in SELF TUNE mode.  After a short delay (15 secs), Output 1 will turn ON, and the controller will start to analyze the system. ECLIPSE INSTRUMENTATION DIVISION page 3-1095