QI) The following PLC program was written to control the operation of a large electric motor- driven pump. A variety of "permissive" inputs protect the pump from damage under abnormal conditions, and one permissive in particular ("valve open") will only allow the pump to start up if one of the valves in the piping system is in the full-open position: Start Valve open Motor (s)- Stop Motor (R)H Bearing temp. Vibration Motor temp. Oil pressure Identify the type of contact (either NO or NC) necessary for each of these electrical switch contacts, based on the trip condition (either high or low) and how each input is applied in the PLC program: 1. Start pushbutton = NO or NC? 2. Throttling valve open limit NO or NC? 3. Stop pushbutton = NO or NC? 4. High bearing temperature NO or NC? 5. High vibration NO or NC? 6. High motor temperature = NO or NC? 7. Low oil pressure NO or NC?

QI) The following PLC program was written to control the operation of a large electric motor- driven pump. A variety of "permissive" inputs protect the pump from damage under abnormal conditions, and one permissive in particular ("valve open") will only allow the pump to start up if one of the valves in the piping system is in the full-open position: Start Valve open Motor (s)- Stop Motor (R)H Bearing temp. Vibration Motor temp. Oil pressure Identify the type of contact (either NO or NC) necessary for each of these electrical switch contacts, based on the trip condition (either high or low) and how each input is applied in the PLC program: 1. Start pushbutton = NO or NC? 2. Throttling valve open limit NO or NC? 3. Stop pushbutton = NO or NC? 4. High bearing temperature NO or NC? 5. High vibration NO or NC? 6. High motor temperature = NO or NC? 7. Low oil pressure NO or NC?

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter32: Three-phase Motors

Section: Chapter Questions

Problem 1PA: You are working as a plant electrician. It is your job to install a 300-hp three-phase squirrel-cage...

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