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By A.B. Szwilski and M.J. Richards (Eds.)

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35 (c) When the possibility of the machine initiating roof support movement was considered it was difficult to integrate the necessary safety interlocks into the overall electronic design. As a result in 1979 the design philosophy took a different direction and a second generation was developed based on the principle that all support operations would be controlled and monitored by a gate end computer. As a result the system of control could be varied by reprogramming the face end 'brain'. This design philosophy reduced the complication of electronics on each support but necessitated the development of a sophisticated face end computer that would withstand difficult underground environment.

In the underground environment safety is a vital part of any design and clearly with automatic control safety features had to be built into the fundamental specification for the electronic design. As a result the system includes:(a) (b) (c) A comprehensive emergency stop facility. A disable facility that isolate a support from any external signal. Before a support operates the system checks automatically that adjacent powered supports are set to the roof. (d) When a support is manually primed by a face operator an automatic time delay prevents the support from being operated.

FO g O B * H· *d ft> H ja ΝΧδ S w £N / - N ft) 3 CO ft) O (-· Da CD O H Ό CO ^ CU 2 PJ H 1 F* ft) < »— f 5' S 48 5m /sec is present in the chutes connecting nodes 5 and 6 and nodes 7 and 12, These flow regulation conditions are specified in Reference 4 and the flow regulation is attained by controlling the flows in the lines noted as 9, 11, 13, 15 and 19. The recommended procedure for modeling flow regulation utilizing the gas network program is to consider the line closed and impose the required flow as an outflow at the upstream node and as an inflow at the downstream node of a regulated line.

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