Method and means for supervision of valve units

Details Method and means for supervision of valve units Method and means for supervision of valve units

1996-03-25

1997-11-04

Hofsass, Jeffery

Communications: electrical

Condition responsive indicating system

Specific condition

340659, 340661, 340662, 363 54, 363 57, G08B 2100

Patent

active

056844654

ABSTRACT:
The invention relates to a method for supervising the functioning of a plurality of valve units, a system for performing the method, a control unit and a control assembly for cooperation with the control unit. Each valve unit in the system comprises a semiconductor element (THY1-THYN) and a control unit for controlling the semiconductor element. The control unit comprises a trigger order input for receiving a trigger order (FP), an indication output for emitting a first indication signal (TP) and a trigger signal output (100) for emitting a trigger signal to the semiconductor element. The method comprises the steps: detecting a positive forward voltage (U.sub.T) across the semiconductor valve, generating a first indication signal (IP) when the forward voltage (U.sub.T) exceeds a first threshold value (U.sub.1), generating a trigger signal upon detected receival of the triggering order signal (FP), and the step: generating a second indication signal (SSTP) when the forward voltage (U.sub.T) exceeds a second threshold value (U.sub.2).

REFERENCES:
patent: 4325114 (1982-04-01), Kobayashi et al.
patent: 4377835 (1983-03-01), Asplund et al.
patent: 4633380 (1986-12-01), Kashiwazaki
International Search Report--National Application Number 9501161-5.

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