| 摘要 |
PCT No. PCT/AU90/00035 Sec. 371 Date Oct. 4, 1990 Sec. 102(e) Date Oct. 4, 1990 PCT Filed Feb. 2, 1990 PCT Pub. No. WO90/09691 PCT Pub. Date Aug. 23, 1990.A door interlock system and method are disclosed which are suitable for use for permitting electrical energization of power to components within an enclosure (11). If the door is opened, the components are de-energized. The system and method use a supply circuit breaker (5) external of the enclosure (11), and an enclosure circuit breaker (27) within the enclosure. A door sensing circuit (31) comprising an intrinsically safe barrier device senses a door of the enclosure (11) closed by door switch means (33). If the door is opened the door sensing circuit (31) opens a pilot circuit (25) which interrupts pilot circuit current and causes a pilot relay (21) to operate to trip-out the supply circuit breaker (5) thus, de-energizing the enclosure (11). A relay circuit (29) is interconnected with the pilot circuit (25), intrinsically safe barrier device (31) and the enclosure circuit breaker (27) to trip-out the supply circuit breaker (5) or enclosure circuit breaker (27) in response to sensing other electrical faults. |
