PssPTIST3 : Documentation diagram
Created: 05/02/2012 13:20:29
Modified: 04/01/2013 09:35:05
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<b>Parameter Notes:</b><br/><ol>
<li>Tap selection table – the output control signal is used to select an autotransformer tap position, which, in turn, modulates the feedback terminal voltage (digital output option).</li><li>Averaging function – The tap averaging function keeps a running average of the last, NAV, control outputs (clicks) up to a maximum of 16. This feature can be disabled by setting NAV equal to 1 (i.e., average 1 output). The last NAV outputs are stored in the output averaging table, VAR(1) through VAR(16). The sum of the last outputs is stored in the output accumulator. The averaging feature was added to reduce tap chattering under steady-state conditions.  If the control output at any given click exceeds the threshold specified in, Athres, the averaging function will be automatically bypassed, and that output signal will be passed directly to the limit function. This feature has been added such that under transient conditions the stabilizer reverts to normal operation. When the absolute value of output signal is beyond the threshold, the output averaging table entries and accumulator are zeroed out. When the signal falls below the threshold, the table is rebuilt starting with the first signal within the threshold. If the output averaging is enabled, then the threshold value would probably be specified in the range from 0.002 to 0.02.</li><li>Limit function – Counts the number of control outputs that the output signal continuously exceeds a user-defined threshold as set in Lthres and After the output signal has continuously exceeded the threshold for a number of user defined counts as specified by NCL, the function ramps the tap position to nominal or the analog output to zero over a user-specified number of counts as defined in NCR.</li></ol><p/>