Phasetronics Three Phase SCR Power Control EZ3-3850

The Phasetronics Three Phase SCR Power Control EZ3-3850 from Thermal Devices, an authorized Phasetronics distributor. 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.

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