TM
SCR Modulation
SCR modulation is designed to provide extremely accurate control of humidifi er output. For a three phase humidifi er, each
set of three heating elements within the humidifi er evaporating chamber will be modulated to provide 0-100% control of the
humidifi er output (capacity). The SCRs used are zero-cross, meaning they switch on and off when the alternating current
crosses from negative to positive (and vice versa), reducing line noise. It fi res on a one-second time base (fi eld adjustable),
allowing the humidifi er output to parallel the control signal from the humidity controller. The SCR pulses the immersion
heater power according to the control signal for a percentage of each second e.g. at 50% power the heater will be on for 1/2
a second and off for 1/2 a second.
Modulating Control Description
To Next Page
Loading...
Need help?
General
