Temperature controller and alarm device for use with a cartridge

Details Temperature controller and alarm device for use with a cartridge Temperature controller and alarm device for use with a cartridge

1987-01-06

1988-06-14

Paschall, M. H.

Electric heating

Heating devices

With power supply and voltage or current regulation or...

219497, 219508, 219501, 361 47, 361 87, H05B 102

Patent

active

047513713

ABSTRACT:
A temperature controller and alarm device for use with a cartridge heater of the general type providing heat within a mold in a plastic injection molding apparatus includes an amplifier for sensing voltage signals developed by a thermocouple within the cartridge and which signal is representative of the temperature produced by the heater. The heater temperature is compared to a desired temperature and a signal proportional to the difference in temperature is coupled to a comparator which produces an output signal when the magnitude of a triangular signal exceeds the magnitude of the difference signal to cause the comparator to operate switches which connect and disconnect a DELTA configured three-phase voltage source to and from both sides of the heating element. Visual and audible alarms are provided to indicate the occurrence of a thermocouple open circuit fault condition, a heating element open circuit fault condition and a heating element short circuit fault condition. Another visual alarm is provided to indicate a fault condition associated with the switches.

REFERENCES:
patent: 3946200 (1976-03-01), Juodikis
patent: 4167663 (1979-09-01), Granzow, Jr. et al.
patent: 4511790 (1985-04-01), Kozak
patent: 4554439 (1985-11-01), Gross et al.
patent: 4639611 (1987-01-01), Sticher

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