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Introducing Useful Functions
UTAdvanced® Digital Indicating Controllers
In this lesson we describe temperature control in an electric furnace using the UTAdvanced digital indicating controller, utilizing SCRs (thyristors) and SSRs (solid state relays).
The temperature is controlled as follows: the current temperature inside the furnace is measured with a thermocouple, then the UTAdvanced digital indicating controller outputs a control signal to the SCR and SSR, and the power supplied to the heater is controlled.
Using a SCR (thyristor)
Figure 1. Temperature control with a SCR (thyristor)
Thyristors can be used in phase control and zero cross control. With phase control, the power supplied to the load can be controlled continuously. This method is used for a wide range of control applications from small capacity devices to large heaters.
Figure 2. Example phase control waveform
Zero cross control is a system which suppresses noises and controls heaters by turning ON/OFF voltage applied on heaters when the AC power supply voltage is at 0 volts.
Figure 3. Example of a thyristor output waveform when OUT is 50% (12 mA).
Using an SSR (solid state relay)
Figure 4. Temperature control using an SSR (solid state relay)
Controling heaters using solid state relays employs time-proportional PID control. With time-proportional PID control, the control output values resulting from the PID calculation are converted to ON/OFF ratios of the cycle time (CT).
Example: What is the ON time when the OUT ratio is 10% and the cycle time (CT) is 2 seconds?
(Answer: 0.2 seconds.)
Figure 5. Example of time-proportional PID power pulse output
To set to: PID control, thermocouple type K (range 0.0 to 500.0 ℃), current control output (4 to 20 mA)/voltage pulse output control, set each parameter on the UTAdvanced digital indicating controller.
For details on setting parameters, see the materials below.
- Technical materials: TI 04L01L01-02EN
Setup procedure: UTAdvanced Quick Settings (Controlling Furnace Temperature with a Thyristor) - Technical materials: TI 04L01L01-03EN
Setup procedure: UTAdvanced Quick Settings (Controlling Furnace Temperature with a Solid State Relay)
