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Solid State Temperature Controller

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Temperature control in an electric furnace using the Advanced 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 Advanced 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)

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.

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.

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.)

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 Advanced digital indicating controller.

The Axis family of microprocessor based controllers combine a high degree of functionality and reliability at a very low price, in 4 different formats : 1/16 DIN, 1/8 DIN, 1/ 4 DIN.They are ideal controllers for regulating temperature in a variety of applications, including :
  • Plastic Machines
  • Furnace Temperature Controls
  • Heat Treatment
  • Ovens
  • Dryers.
  • Semiconductor packaging /testing.
  • Plastic processing.
  • Packaging machinery.
  • Painting and coating.
  • Climatic chambers.
  • Health Care
  • Furnace Controls

The Axis family satisfies low cost basic control requirements and also provides advanced features such as motor position control, phase angle power control and Setpoint programming Dual displays and Bargraph. Programmer functionality.Two 4 digits displays and one LED bargraph to display the PV and SP.Easy to configure. Two different configuration levels provide easy access to parameters.A 4-digit security code preventsunauthorized changes. Parameters can be hidden to the user to prevent misconfiguration of the unit.
  • Various Control algorithms.
  • PID or ON/OFF control.
  • Heat/Cool Algorithm.
  • Motor Position control.
  • Single phase or 3 phase control.
  • 2 programs available, each of 8 segments. Programs can be linked to form a single 16 segments program.Extended Alarm capability.

Up to 3 different alarm outputs per instrument, 17 different alarm modes available.
Universal Power supply.Operates on any line voltage from 85Vac to 265Vac at 50/60Hz.


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