temperature control
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In temperature control applications the main feedback control loop normally includes a temperature sensor and PID heating controller.
The thyristor stack responds to a demand signal from the temperature control and adjusts the average load power accordingly. The stack may be fitted with local feedback circuits which monitor the line or load voltage and load current. In most applications this is not necessary, but can help in reducing temperature variations by immediately compensating for changes in these parameters, rather than relying on the temperature sensor to sense the effect.
Transformer coupled heating loads in which a transformer is interposed between the thyristor temperature control and the load or when the resistance of the elements are very low. A typical application is graphite elements in high temperature furnaces. When thyristors are used to feed transformers the integrity of firing circuits is very important. These circuits must be very stable and immune to interference, as otherwise the transformer may be subjected to inrush currents.
For more information on temperature control devices from Caledon Control you can contact us and one of our team will be able to advise you on the best options available to you.