Solid State Relay Heater Control

Solid state relays for heater control.

Solid state relay heater control.

Solid state relay drive will control the heater power supply in order to maintain the required temperature. For heater control list. Solid state relays are usually mounted on a heat sink to dissipate the heat they generate. This article provides an introduction to the basic operation of solid state relays with a focus on the output devices in today s ssrs.

Omega engineering created date. When using ssrs to switch high currents for heating elements they do require a heat sink. No sparking during. For switching a small fridge or 60w heater the current is so low that a heat sink is usually not necessary.

Check the datasheet of the scr you are using. Increased life time of relay and heater. With a small dc voltage it can switch high ac currents. Test results show that zero cross solid state relays in combination with the fast cycle card promote better temperature control and longer heater life than slow cycle relays.

For heater control these relays enable high precision high frequency temperature control for reflow ovens molding machines and sintering ovens. Ssrs solid state relays are usually scrs or triacs that are activated via a opto coupler all built into a single package. Ssrs consist of a sensor which responds to an appropriate input control signal a solid state electronic switching device which switches power to the load circuitry and a coupling mechanism to enable the control signal to activate. Pid controller will generate pwm as per temperature input signal feedback.

A solid state relay ssr is an electronic switching device that switches on or off when an external voltage ac or dc is applied across its control terminals. One problem with triacs and scrs is the voltage drop across them when on. Advantages over electro mechanical relays. Faster reaction time.

It should tell you the voltage drop. Through a time proportional cycle rate of 1 10 of a second heater life will be extended. A solid state relay ssr is a digital switch for ac current. This can be 1 5 v or more.

If several of these relays are mounted in a control panel ventilation or even cooling of the control panel may be necessary. Models are available with fault detection and cyclic control.