Specifications

STEP 6: When ready to start Auto-Tuning calculation of PlD settings press
the “Enter/Tune” button. The displays will return to process and
set point displayed. The F/C digit will blink while tuning is in pro-
cess. Upon completion of tuning, the digit will stop blinking. TO
stop the Auto-Tuning press standby/cancel.
NOTE:
Series 6275, RTD input will not Auto-Tune when the decimal point
range is used. If tenth degree range is desired either auto tune on
the other range and then move the range jumper or use manual
tuning methods.
How to override automatic tuning parameters
(Also refer to Ziegler-
Nichols Tuning Method)
It is possible to set or fine tune the three mode parameters manually.
To manually enter parameters
1) Press Index button until "Rt" (Rate), "HG" (Heat Gain) or CG (Cool Gain)
are displayed.
2) Enter new parameter setting desired using the up/down buttons.
3) Press the “Enter” key.
The new parameters will now take control of the process.
5.3.3 Manual Tuning procedure
The following procedure can be used for fine tuning after or instead of Auto-
Tuning.
Ziegler-Nichols PID Tuning Method
This has long been an accepted method of tuning PID (3 Mode) controllers
using a minimum of time and set up to reach effective tuning parameters.
Before proceeding make sure the basic unit setup is done as discussed in
section 5.2.
22