Phase power controller EZ series

SCRburstopen-frame type

Phase Controllers Control of resistive and lamp type loads Motortronics’ EZ Series are true zero voltage switching controllers. They are designed to fire at the minimum voltage differential across the SCR with a gate pulse applied prior to the zero-crossing point. These controllers are virtually RFI free. The EZ Series zero fired (Variable time base) SCR Power Controllers combine low cost with microprocessor technology. They feature 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 unit’s output will continuously change to satisfy load requirements.