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PPI - Thyristor controllers designed for the control of resistive loads

Published Nov 23 2009 [Printer friendly version] [Email article to a friend] [More Subs & Systems articles]

PPI - Thyristor controllers designed for the control of resistive loads Manufactured in the UK by Power Products International (PPI), Spectral 3 phase thyristor controllers are designed for the control of resistive loads in furnaces and HVAC heater batteries from a BMS control system.

Standard units accept an input signal of 0-10V and can be either self, or line powered. Available in 12kW and 18kW they are DIN Rail mountable. Utilisation of the burst-pulse control principle means that power is SWITCHed to the load only in multiples of complete mains cycles, thus keeping supply disturbances and electrical noise to a minimum. For example, with a control input signal of 5VDC and with a 50% power demand the unit will switch on for 0.4 seconds and off for a similar period. A pro rata power output would apply to other input voltages, says the company.
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