Caloritech™ ZF Thyristor Power Controls (SCRs) are solid state switches that can open and close silently and as frequently as the control device dictates (even many times per second). This fast switching does not affect the life of the device as there are no moving parts. Besides improving process control, the fast switching will extend heater life. Heaters will normally stabilize at actual requirements rather than continuously cycling between off and maximum output. For most process applications, zero voltage switched SCRs are preferred. This type produces minimal voltage spikes that may cause radio frequency interference (RFI). Phase angle fired units are available as an option for low mass heating sources that can change temperature rapidly - such as infrared lamps.
Features & Benefits At A Glance
- manufactured in all standard voltages, single or three phase
- available with current ratings from 15 to in excess of 1000 Amps
- all control inputs can be accomodated including the most common process signals: 0-5k ohm and 4-20 mA
- single phase units are single leg break; three phase units available in 2 or 3 leg break
- available as separate components or for more reliable performance, can be ordered as part of a factory designed and built control panel