Controller for heat engineering installations
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jan 14, 2003
Grant Date -
N/A
app pub date -
Jun 27, 2000
filing date -
Aug 28, 1999
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A controller has two shunt lines connected in parallel with safety relays. For testing their switching capability, the safety relays are reversed to their idle positions and the change in voltage is monitored on their idle contacts. If voltage is missing, an error signal is issued. During the test, the parallel shunt line is closed so that the safety power line is not interrupted. Switching amplifiers having a response and action time which is a fraction of the preset response time of the safety relays control the safety relays. For testing the electrical control, the drives of the safety relays are switched to currentless and the change in voltage is monitored on the drives. If the change in voltage is inadequate, an error signal is issued. The safety relays remain in their operating positions during the test.
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