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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.