Introduction; Advantages Compared With Analog Thyristor Unit - CD Automation REVO E 3PH User Manual

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2 Introduction

A thyristor unit is semiconductor device which acts as a switch formed by two thyristors in ant parallel.
To switch on the alternating current the input signal will be on and the thyristor will switch off at first
Zero Crossing voltage with no input signal.
The benefits of thyristor units compared with elettromechanical contactors are numerouses: no moving
parts, no maintenance and capacity to switch very fast. Thyristors are the only solution to control
transformers and special loads that change resistance with temperature and with age.

2.1 Advantages compared with analog thyristor unit

REVO E is an universal Thyristor unit, designed to control resistive or inductive loads including three
phase transformers. The electronic circuit is completely digital and is based on a powerful
microprocessor with high performance that allow the use in different ways:
 Single cycle
 Burst Firing with soft start
 Delayed triggering
 Phase Angle with soft start
On same unit can be used different feed back that define the control mode:
 Voltage
 Current
 Power VxI
 External 0÷10Vdc
On same unit can be used different input:
 4÷20mA
 0÷10Vdc
 Potentiometer 10KΩ
 SSR
REVO E-3PH from 25A to 500A
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User's Manual