EZ2 - Three Phase SCR Power Control

Three Phase Power Control

TRUE ZERO VOLTAGE SWITCHING Phasetronics' new EZ SERIES zero voltage switching controllers are designed to fire at the absolute minimum voltage differential across the SCR with a gate pulse applied prior to the zero crossing point. These controllers are virtually RFI free. VARIABLE TIME PROPORTIONING EZ SERIES zero fired (Variable time base) SCR Power Controllers combine low cost with microprocessor technology. The EZ SERIES features a rapid-cycle control technique that provides resolution that potentially extends the life of industrial resistance heaters. This variable time base control technique minimizes off time and is characterized by rapid on/off cycling with on-to-on cycle time ranging from 1 to 3 cycles for power ranges of 25% to 100%. Thermal cycling of the heater elements is reduced to a minimum for all power levels to improve element life. Control of the on-to-on cycle times provides the resolution required to maintain a smooth, even output from resistance heaters. The number of on cycles within a burst and the off time between bursts is continually monitored and updated by the microprocessor. A constant heater output is ensured since the units output will continuously change to satisfy load requirements. For example, the maximum off period from 50% power to 100% power is one cycle.


AC Supply Voltage: 120 - 575 Vac

Amp Ratings: 10 to 1000 Amps

Control Signal: 4-20 mA, 0-5mA, 10-50mA, 0-10 Vdc

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    External Inputs  
    Automatic Signal Input: 4-20mA (500 Ohm), 0-5mA (2K Ohm), 10-50mA (200 Ohm), 0-10 Vdc (34K Ohm)
    Manual Control: 10k ohm, 2 watt potentiometer, linear taper (customer provided)

    Output Voltage: 0 to 100%
    Output Current Rating (Model dependent): 10 to 1000 Amps
    Output Stage: Back to Back configuration (AC Switch)
    AC Supply Voltage: 120/208/240/380/415/480/575 Vac (+10% to -15%, 50/60 Hz) *
    Type of Loads: Resistive Only
    LED Readouts: PC board mounted LED's Indicate on and output. A plug connection offers the ability to move these readouts to a remote location.

    Protective Networks  
    Transient Voltage Suppressor: Integral MOV (Metal Oxide Varistor) protects against high potential transient voltage
    SCR Peak Inverse Voltage (PIV Rating): Units up to 100A: 1600V, Units 150A to 1000A: 1800V

    Cooling: Convection cooling thru 150A. Fan cooled at 225A and above
    Ambient Temperature: Operating range is from 0°C thru 40°C (32°F thru 104°F)