In Example 18.10, there are two switches to start the pump. In addition, consider that the pump

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In Example 18.10, there are two switches to start the pump. In addition, consider that the pump can be automatically started by a newly installed high-level switch as long as the stop switches are not pressed. Modify the ladder diagram shown in Figure E18.10(b) accordingly.


Example 18.10Figure E18.10(a) shows the schematic of a storage vessel, V-101. Pump P-101 has two start and stop switches

Water in VLV-101 V-101 LSL LSL-101 VLV-102 P-101 Figure E18.10(a) Schematic of a Storage Vessel To Users

The ladder diagram is shown in Figure E18.10(b). In Rung o, if any one of the pump start switches is pressed,

due to low level, the input to the Start P-101 contact becomes false and trips the pump.

Figure E18.101 Start Switch 1 Start Switch 2 OSR Stop Switch 1 Stop Switch 2 LSL-101 # # #H ONM1 GJ Start P-101 ONM1 Start

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Analysis Synthesis And Design Of Chemical Processes

ISBN: 9780134177403

5th Edition

Authors: Richard Turton, Joseph Shaeiwitz, Debangsu Bhattacharyya, Wallace Whiting

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