Red Lion TSC - Manual (Page 72)

AUTO-TUNE (Cont’d)
A damping code setting of 0 gives the fastest response with some overshoot,
and a code of 4 gives the slowest response with minimum overshoot.
For heat/cool systems, use a damping code of 1 or 2. On these systems, the
relative cooling gain (Gan2) and heat/cool overlap (db-2) must be set by the
user (the controller will not alter these parameters). (See Cooling section for
adjustment of these parameters). During Auto-Tune, it is important that
external load disturbances be minimized, and if present, other zone controllers
idled as these will have an effect on the PID constant determination. Keep in
mind for large thermal systems with long time constants, Auto-Tune may take
hours to complete.
To Initiate Auto-Tune:
Make sure that Auto-Tuning is enabled in parameter lockouts module.
Place the controller into the normal display mode.
Press PAR for 3 seconds from normal display mode.
Scroll to “tUNE” by use of PAR, if necessary.
Select “YES” and press PAR.
Auto-Tune is initiated.
To Cancel Auto-Tune: (Old PID settings remain in effect).
A) Make sure that Auto-Tuning is enabled in parameter lockouts module.
Place the controller into the normal display mode.
Press PAR for 3 seconds from normal display mode.
Scroll to “tUNE” by use of PAR, if necessary.
Select “NO” and press PAR.
Auto-Tune canceled.
B) Or reset the controller by disconnecting AC power.
Note: If using the linear DC output for control, full power will be applied
(+100% OP1 or -100% OP2) regardless of the output power limit settings.
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DAMPING CODE FIGURE
Note: Actual responses may vary depending on the
process, step changes, etc.