Alpes Lasers . TC-3 Manual de usuario descargar pdf (Pagina 34)

Page 34 · TC-3 Temperature Controller User’s Manual

To manage this internal thermal load, the TC-3 relies on two methods

of power control: a tunable power supply and current limiting. Where

possible, the internal power supply will be adjusted down to minimize

the thermal load inside the instrument.

In some cases, power supply adjustments are not enough, and the

instrument will then reduce the drive current until the internal thermal

load is within the maximum allowable. In many cases, this will have

little effect on the operation of your application, but may slow the

transition from one temperature to another.

However, there may be conditions where the reduced current actually

prevents the mount from achieving the desired operating temperature.

The only solution in this case is to increase the load voltage. The

simplest method is to wire a power resistor in series with the TEC to

create additional voltage. Depending on the voltage of your controller

and application requirements, the value of the resistor will vary, but is

typically in the 0.5Ω to 1Ω range. Contact the factory for additional

support.

When in ITE mode, the current will not be limited, and an error will be

generated and the output turned off if operating outside the allowable

range.

The graphs below illustrate the minimum voltage requirements for the

standard TC-3 controllers. Custom configurations will have a different

profile.

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Alpes Lasers . TC-3 Manual de usuario Pagina 34