Change Pid Tuning - Thermo Scientific 3907 Operating Manual

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Chapter 13
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13-6 Model 3907 & 3948

Change PID Tuning

The procedure for changing PID tuning values follows.
1. Remove software lockout, if not already performed.
2. From home screen, press and hold the "UP" and "DOWN" arrow keys until the
display reads "Oper" in the lower display and "Ai" in the upper display.
3. Press the "DOWN" arrow key until "LOOP" appears in the upper display.
4. Press the "ADVANCE" key until "h.Pd" appears in the lower display.
5. Press the "UP" and/or "DOWN" arrow keys to set the value in the upper display.
6. Press the "ADVANCE" key until "c.Pd" appears in the lower display.
7. Press the "UP" and/or "DOWN" arrow keys to set the value in the upper display.
8. Press the "ADVANCE" key until "ti" appears in the lower display.
9. Press the "UP" and/or "DOWN" arrow keys to set the value in the upper display.
10. Press the "ADVANCE" key until "td" appears in the lower display.
11. Press the "UP" and/or "DOWN" arrow keys to set the value in the upper display.
12. Press the "Infinity" key to return to home screen.
13. Return software lockout to its prior settings.
If the above RH PID parameters do not provide the desired control, the RH controller has
an Auto Tune feature that can be initiated. Please follow the Watlow PM Control Auto Tune
procedure below.
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