Driving AC loads

Introduction

Consider some problems:

● A pump in a domestic or industrial heating system must be switched on and off at preset times.

● A series of high-intensity lights around the perimeter of a factory complex are to be activated in the event of a security incident.

● An electrical heater in a brewery must be used to maintain a precise temperature.

● The motor in a washing machine must go through a pre-programmed series of movements.

In these – and many other applications – we need safely and reliably to control comparatively high-level AC supplies. In this chapter we will consider two popular approaches to this problem

EMR DRIVER [page 149]

SSR DRIVER ( AC ) [page 156]

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