SCR Power Controllers :: SCR

SCR POWER CONTROLLERS

CCS Series
SCR Power Controllers
Zero-Crossing or Phase Angle
Up to 750 A, 1 or 3 Phases

Technology

An SCR power switch differs from other switches in its fast action. Indeed, while a contactor may cycle 3 times per minute, a Cristal Controls’ SCR may do it approximately once per second. This fast SCR cycle time results in a final temperature closer to the desired set point and therefore reduces energy costs.

Unlike traditional mechanical control, the SCR modulates small increments of power to the load, and eliminates the overshoot and undershoot associated with mechanical control.

Zero-Crossing SCR Series

Cristal Controls’ Zero-Cross Fired Power Controllers are ideal for the control of purely resistive loads that can accommodate fast, full power, ON-OFF cycling.

When coupled with a time proportioning control, they operate in a series of full ON-OFF cycles known as time proportioning burst firing. The time proportional control accepts many control output signals and converts them into a time proportional signal determining the amount of full ON and full OFF cycles. A smooth power output to the load is therefore produced and the temperature, stabilized.

How It Works	Connections

Applications

The technology of Cristal Controls’ SCR electronic power controllers ensures a sustained energy input and a constant heat charge. They are ideal for the majority of commercial and industrial electric heaters, such as:

• Duct heaters
• Electronic boilers
• Electric humidifiers
• Industrial & commercial ovens and furnaces
• Mine heaters
• Integrated circuit processing equipment
• Temperature control
• Electrical resistances

Available options

• 3 legs power control
• Semiconductor fuses
• Panel mounting

Advantages

• Modulates the power nearest to the demand and reduces energy costs and power consumption
• Keeps the temperature closer to the desired set point for best comfort
• Higher precision, superior than mechanical contactors
• Fast adjustment and installation
• Zero-crossing operation and silent arcless switching
• Cycles once per second; very fast and quiet
• No maintenance necessary, due to less mechanical parts failure
• Life expectancy higher than 1 000 000 000 operations
• Does not create RFI (radio frequency interference) and will not affect sensitive electronic equipment
• Epoxy thermally protected for humidity, overheat or contaminated environment protection
• Protected from line voltage transients and more reliable in a variety of applications

Specifications

• Accepts multiple input signals: 0-135 Ohms, 0-10 Volts, 4-20 mA, 0-5 Volts.
• Security factory of 2, i.e. 600 Volts surge protected and built for 1200 Volts.
• Up to 750 A at one or three phases
• CSA certified
• Opto-isolated from high voltage
• Also available for pneumatic control, thermally protected
• Exclusive 2-year warranty.
• The SCR can be placed inside a NEMA-4 control panel to suit any specific control requirement.

Zero-Crossing SCR 15 TO 90 A		Download technical data
Power Module	15 to 40A:	Built-in
	50 to 90A:	External
Heat Sink	Type MS-15170
Voltage	15 A	48 @ 347 Vac, 1 Phase and 48 @ 600 Vac, 3 Phases
	30 to 90A	48 @ 600 Vac, 1 or 3 Phases
External Power Supply	24 Vac (6 mA total for all models)
Modulating Control	Yes
Zero-Crossing	Yes
Opto-isolated	Yes
Option	Integral Overheat Protection (MiEC-4)

Zero-Crossing SCR 135 TO 250 A		Download technical data
Power Module	135 to 250A	External
Heat Sink	No 62905
Fan	150 cfm
Voltage	48 @ 600 Vac, 1 or 3 Phases
External Power Supply	24 Vac (6 mA total for all models)
Modulating Control	Yes
Zero-Crossing	Yes
Opto-isolated	Yes
Option	Integral Overheat Protection (MiEC-4)

Zero-Crossing SCRs Nema-4 - 15 to 250 A		Download technical data
Difference between SCR and SCR NEMA-4 NEMA-4 SCRs are designed so the heat sink is completely outside the enclosure and all the electronic controls are located inside the enclosure.
Power Module	15 to 30A:	Built-in
	50 to 250A:	External
Heat Sink	15 to 30A	Type MS-19921 and / or 66157-6
	50 to 250A	Type 66157
Voltage	15 A	48 @ 347 Vac, 1 Phase and 48 @ 600 Vac, 3 Phases
	30 to 250A	48 @ 600 Vac, 1 or 3 Phases
External Power Supply	24 Vac (6 mA total for all models)
Modulating Control	Yes
Zero-Crossing	Yes
Opto-isolated	Yes
Option	Integral Overheat Protection (MiEC-4)

Phase Angle SCR Series

Cristal Controls’ Phase Angle controls provide smooth proportional output from 0 to 100%.

They are designed to offer low cost high quality SCR phase control. This series offers variable voltage outputs for many applications.

We control load current from 15 A to 750A, at line voltage from 120 to 600 Vac.

A soft start (5 seconds) option ensures a slow rising output voltage to prevent saturation of inductive loads. The 5 seconds soft start is active on powerup and is reset after a power loss. Custom programmation is available. Contact us for more information.

How It Works	Connections

Applications

• Quartz lamps
• Tungsten lamps
• Wire annealing
• Oven & furnace control
• Kantal elements

Phase Angle SCR 15 to 250 A		Download technical data
Power Module	External
Heat Sink	Type MS-15170
Voltage	208, 240, 277, 347, 480, 600 Vac, 3 phases (47 to 63 Hertz)
External Power Supply	24 Vac, 100 mA (5VA) on cold start, 40 mA (1 VA) when running
Signal	0-5 Vdc, 0-10 Vdc, 4-20 mA Has to be specified when ordering
Input tension	20 to 28 Vac (1 mA)