Alpes Lasers . TC-3 Uživatelský manuál stáhnout pdf (Strana 29)

TC-3 Temperature Controller User’s Manual · Page 29

Resistive Heaters and Heat/Cool Only

Modes

The TC-3 supports temperature control using resistive heaters instead

of Peltier coolers. With resistive heaters, cooling is obviously not

possible, and the TC-3 must be configured to not attempt to cool the

output, or a run-away condition will occur when the cooling current

actually causes additional heating.

If your application requires, you can also configure the TC-3 to operate

in a cool-only mode. This is only possible with Peltier coolers, as

resistive heaters will heat regardless of the direction of current..

To change the cooling mode, adjust the H/C Mode setting to

Heat/Cool, Heat Only, or Cool Only, as appropriate.

Gain Control and the PID Loop

The TC-3 supports a fully configurable PID loop, allowing full

customization of the PID control parameters. To simplify control, eight

standard gain settings are also defined, and many applications can

achieve acceptable performance with these predefined gain settings,

eliminating the need to understand and adjust the PID loop.

The predefined gains are numbered 1 through 300, and set using the

Gain menu setting. Increasing the gain value will increase the speed of

the control loop. For full access to the PID parameters, change the

Gain setting to PID, and the individual P, I, and D values will be

available as settings in the menu.

The PID parameters function within a mathematical formula as

described below:

PID Formula:

Output=P∗ε+I∗

∑

εdt+D∗

dε

Where

is the error in the system, expressed as:

= Target - Actual

The controller can calculate ideal PID values using the AutoTune

function, discussed in detail in the next section.

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Alpes Lasers . TC-3 Uživatelský manuál Strana 29