Design And Installation of a Complete Fire Alarm And Night Watch Service System for An Industrial Plant
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In our eReader you can find the full English version of the book. Read Design And Installation of a Complete Fire Alarm And Night Watch Service System for An Industrial Plant Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book Design And Installation of a Complete Fire Alarm And Night Watch Service System for An Industrial Plant
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The value of the circuit connections in case - 14 - of trouble on the line is "best shown by assuming the two most common faults, open-circuit and ground, and noting the effect on the circuit, which is shown for normal operation In the diagram, Tn the case of an open circuit anywhere on the line or in the boxes the levers of both relays will drop, making contact with the lower points, causing the lamp to light and the register to run continuously. The operator then throws switch M into other po...sition, which changes the relay connections from series to parallel, and cuts out the lamp circuit, causing the local contacts of both relays to operate the register. Then RR will relay only signals from boxes IBetween it and the open, and LR will relay signals from the remaining boxes, which will be between it and the open. It will be ^j seen that the circuit is thus divided into two parts, each a complete circuit with ground return for each of the boxes, which are now in parallel. By noting which of the box numbers register on each relay, t he trouble man can get location of the fault between two boxes before leaving the relay board, '''he operator will know when the open has been repaired, for both relays will respond at the same time to any box on the line; he can then throw switch M back to position for normal operation.
What to read after Design And Installation of a Complete Fire Alarm And Night Watch Service System for An Industrial Plant?
You can find similar books in the "Read Also" column, or choose other free books by Roller, L. H to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
The value of the circuit connections in case - 14 - of trouble on the line is "best shown by assuming the two most common faults, open-circuit and ground, and noting the effect on the circuit, which is shown for normal operation In the diagram, Tn the case of an open circuit anywhere on the line or in the boxes the levers of both relays will drop, making contact with the lower points, causing the lamp to light and the register to run continuously. The operator then throws switch M into other po...sition, which changes the relay connections from series to parallel, and cuts out the lamp circuit, causing the local contacts of both relays to operate the register. Then RR will relay only signals from boxes IBetween it and the open, and LR will relay signals from the remaining boxes, which will be between it and the open. It will be ^j seen that the circuit is thus divided into two parts, each a complete circuit with ground return for each of the boxes, which are now in parallel. By noting which of the box numbers register on each relay, t he trouble man can get location of the fault between two boxes before leaving the relay board, '''he operator will know when the open has been repaired, for both relays will respond at the same time to any box on the line; he can then throw switch M back to position for normal operation.
What to read after Design And Installation of a Complete Fire Alarm And Night Watch Service System for An Industrial Plant?
You can find similar books in the "Read Also" column, or choose other free books by Roller, L. H to read onlineMoreLess
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