Solid state relays take control

With the latest introduction of the DC analogue input solid state relays, CD Automation now boasts the most comprehensive power control device range on the market today.

With the latest introduction of the DC analogue input solid state relays, CD Automation now boasts the most comprehensive power control device range on the market today.

The extensive range is capable of accurately controlling a wide spectrum of electrical loads up to 3000kW, from simple single-phase heaters up to complex high temperature-coefficient three-phase loads.

Available in 35 current steps from 10 to 2600A, the fully digital range will accept any standard industrial signal inputs and is compatible with virtually all industrial voltage supplies.

Built on a robust product platform, the CD3000 series family concept means that common features are used throughout the entire product range.

Whether the chosen controller is a single-phase 15A, 240V solid state relay or a three-phase, 700A, 600V, phase-angle fired thyristor power controller, all similarly numbered terminals have the same functionality on any unit.

The CD3000 range can be divided into four basic levels of functionality: CD3000S - a solid state relay family; CD3000M - thyristor power controllers for fixed and variable resistive loads; CD3200/CD3000E - thyristor power controllers for fixed and variable resistive and transformer and inductive loads; and CDNext - modular DIN rail mount, temperature and power controller system.

The CD3000S range, available in one, two and three phase versions, comes with a choice of DC logic input (SSR), 110/230V AC input or analogue 4-20mA or 0-10V DC inputs (single phase units only), with a supply voltage up to 600V and control of single phase loads up to 700A.

The addition of heater break alarm across the range provides the user with alarm and diagnostic information such as partial or total load failure and SSR failure (short circuit).

Specific models now have the added option of an internal current transformer, saving cabinet and DIN rail space.

With major applications in plastic injection and extrusion, ovens and furnaces, heating and air-conditioning, these units are designed to replace electromechanical power relays and contactors.

Key benefits include faster switching, no wear, quiet operation and no electrical interference.

CD3000M series can be used to control single-, two- or three-phase loads and comes in 22 standard current steps from 15 to 700A.

Standard features include universal input and universal firing and includes zero crossing (ZC), single cycle (SC), burst firing (BF), phase angle (PA), delayed triggering (DT) as well as soft start options.

The M series, like the solid state relays, boasts the comprehensive heater break alarm feature.

It also includes as standard RS485 communications allowing the unit to be fully configured via a portable PC or remotely across a DCS network for all inputs and firing modes.

Connection can also be made to the CD-KP panel mount display unit - an eighth DIN panel-mount interface that provides real-time monitoring and diagnostics of behind the panel SCRs and thyristor controllers.

Scroll selection of setpoint power, power read out, current and voltage values and display indication for heater break alarm or SCR short circuit are all provided.

Both the CD3200 and CD3000E products have been designed specifically for driving resistive, inductive and transformer coupled loads, controlling power delivery by using phase-angle firing and protecting against excessive inrush currents using the current limit facility.

Typical load types controlled include Molybdenum, Tungstenum, Superkanthal, silicon carbide elements and quartz lamp infra-red short waveform.

The CD3200 is a single phase unit and the CD3000E can control two or three phases, both having universal inputs, universal firing, RS485 communications, current limit, heater break and control feedback.

Depending on the number of phases being controlled, these units have numerous current steps from 15 to 2600A and can be configured by the customer if required.

Universal input, firing and feedback are fully configurable via RS485 communication port.

Finally, the CDNext has been designed for multiloop systems with electrical heating.

The modular system consists of both a PID temperature controller and a SCR for heating and cooling.

Up to 10 loops of control and power can operate from just one comms base unit saving on both space and wiring.

Key features include single loop integrity, hot swap functionality and auto-addressing.

The CDNext modular system is designed for field-bus systems including Profibus DP, Devicenet and Modbus protocol.

CD Automation's rugged thyristor units are designed for industrial applications such as glass ovens, extruders, electrical furnaces and drying processes.

The full product range is available exclusively in the UK through Paragon Alliance.

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