Watlow Series 935A Manual de usuario descargar pdf (Pagina 14)

12 Watlow Series 935A User’s Manual

Choose the PID Strategy

You may rely solely on the Auto-tune [`Aut] function (p. 32) and factory defaults to determine PID values for your system, or you may

use auto-tuning and additional manual adjustments. You must select dead band [``db] and calibration offset [`CAL] values manu-

ally.

The Series 935A PID Menu is the first sub-menu you encounter after moving to the Operations Menu. The PID Menu provides a soft-

ware location to select the individual heat or cool proportional band, hysteresis, and cycle time values; and the dead band, integral,

derivative, and calibration offset values.

To go to the PID Menu:

1. Go first to the Operations Menu by pressing . and , simultaneously for three seconds.

2. Scroll through the Operations Menu with , until you see the [`Pid] prompt.

3. While pressing ß to display [``no], choose [`YES] with . or ,.

4. Release ß to see the first PID prompt.

NOTE: Access to the PID Menu and the prompts there varies with lockout function and output set-up. The PID Menu is

locked out when the 935A leaves the factory.

• Lockout function; the Lockout Tag [`tAg] function masks menus from view (if you cannot see a prompt, you can make no

change). See Using Lockout Functions, p. 18.

• Output set-up; you must choose [hEAt] or [COOL] in either Output 1 or Output 2 to have access to the PID Menu. With a [hEAt]

only choice, [COOL] prompts are not visible, and vice versa. See the Valid Output Functions Table, p. 3, or Setting Up Inputs and

Outputs, p. 20.

NOTE: Proportional Band, Integral, Derivative, Dead Band, and Calibration Offset values are adjustable in whole or tenth

°F or °C, depending on input type [``In] and [`C_F] Celsius/Fahrenheit Configuration Menu choices.

Learn the PID Menu

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Watlow Series 935A Manual de usuario Pagina 14