Alpes Lasers . TC-3 Manual do Utilizador descarregar pdf (Página 30)

Page 30 · TC-3 Temperature Controller User’s Manual

To manually adjust the PID, start by changing the I and D values to

zero, and adjust the P value so that it reaches the set point as quickly

as possible without overshooting the set point an unacceptable

amount. Gradually increase the I value until the set point is achieved

without oscillation. In many systems, the D term is not needed and

may be left at zero.

For additional information on PID loop tuning, consult online resources

such as Wikipedia (http://en.wikipedia.org/wiki/PID_controller) or

search for terms such as “Ziegler-Nichols method”, or “PID Loop”.

Using the AutoTune Function

The TC-3 is capable of automatically determining PID parameters for

most applications. Using a form of the Ziegler-Nichols method, the TC-

3 will step through a process to determine the thermal response of the

mount, which can then be used in a mathematical model to calculate

the PID parameters.

The PID parameters generated by AutoTune are not necessarily the

ideal PID parameters, and small improvements may be possible by

further refining the results manually.

Before starting the AutoTune function, it is best to begin from ambient

conditions, either with the TEC off and the mount stabilized at ambient,

or the TEC on and the set point around 25°C. While this is not required,

it can produce better results. AutoTune only functions in temperature

mode. PID parameters must be manually determined for R mode.

Make sure the current and temperature limits are set prior to starting

AutoTune. AutoTune will intentionally cause your mount to oscillate, so

the temperature limit should be at least 5 to 10 degrees away from the

test point to avoid tripping a limit during the process.

To start the AutoTune function, select the AutoTune PID menu entry

from the main menu and press ENTER. If you wish to perform AutoTune

remotely, see the following section for more information.

WARNING

Do not use the AutoTune function with Alpes

Lasers Housings, as this will reduce their lifetime.

The instructions here are provided only as a

convenience if you use other devices.

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Alpes Lasers . TC-3 Manual do Utilizador Página 30