Understanding Motor Controls
4th Edition
ISBN: 9781337798686
Author: Stephen L. Herman
Publisher: Delmar Cengage Learning
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Chapter 39, Problem 2RQ
To determine
Identify the way in which the components such as coils and contacts are identified in a PLC schematic.
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1.
A mixing vat has an inlet valve, an outlet valve, a mixing motor, and a single level detecting switch (Figure 1).
Both valves are opened by solenoids. The level switch closes when the vat is full and stays closed until the vat is
empty. Draw a PLC ladder logic diagram and provide the allocation list to do the
following:
a. When the start button is pushed, the inlet valve opens until the vat is full.
b. The mixer motor comes on for 5 min.
c. The outlet valve opens until the vat is empty.
(closed)
Level switch
Motor
Inlet valve
Outlet valve
Float
Vat
Figure 1
Chapter 39 Solutions
Understanding Motor Controls
Ch. 39 - Why are NEMA symbols such as push buttons, float...Ch. 39 - Prob. 2RQCh. 39 - Why are normally closed components such as STOP...Ch. 39 - Prob. 4RQCh. 39 - Prob. 5RQCh. 39 - List four basic rules for developing a program for...Ch. 39 - A PLC requires that times be programmed in...Ch. 39 - When programming in Boolean, what statement should...Ch. 39 - When programming in Boolean, what statement should...Ch. 39 - In a control circuit, it is imperative that a coil...
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- What are the key factors to consider when designing a Distributed Control System (DCS) for a large-scale industrial process in the field of mechanical engineering?arrow_forwardWhat industry first started using programmable logic controllers?arrow_forwardName Section 5-2: Line Diagrams-Signals, Decisions, and Actions In the following application, a temperature switch controls a heating contactor and a flow switch is used to ensure there is enough air flow. If there is not enough air flow, an alarm is sounded. Complete the required information. 1. List all the signal devices in the circuit. 2. List all the action devices in the circuit. 3. List the decision part of the circuit that automatically sounds the alarm if there is a problem. 4. When the heating element is on during normal operation, is the flow switch open or closed? CIRCULATING 2 L1 FAN TEMPERATURE SWITCH TR HEATING ELEMENTS FLOW SWITCH -HOT AIR PADDLE AIR FILTER NORMALLY CLOSED FLOW SWITCH 65 ALARM (SOUNDS IF NO FLOW FOR 15 SECONDS OR MORE) Date HEATING CONTACTOR TR ON-DELAY TIMER SUPPLY AIR COLD AIR (3) TIME SET= 15 SEC © 2014 American Technical Publishers, Inc. All rights reservedarrow_forward
- What is the purpose of the key switch located on the front of the CPU in many programmable logic controllers?arrow_forwardA PLC requires that times be programmed in 0.1-second intervals. What number should be entered to produce a time delay of 3 minutes?arrow_forwardQuestion 4 The symbol used for output device in PLC is Not yet answered O a. Marked out of 1.00 P Flag question Ob. Oc.arrow_forward
- dear eng pls ans quickly thanksarrow_forwardIn a control circuit, it is imperative that a coil energize before another one. How can this be done when entering a program into the memory of the PLC?arrow_forwardA pick and Place machine is being used to transfer a box. The arm is extended (out) by energizing a solenoid valve; when the valve is de-energizes, the arm retracts (in). In the same way, a second valve closes the grip (when energized) or opens the grip (when de-energized). Here's a diagram of this "machine": Grip Air Cylinder Grip open Grip Closed Box Arm Air Cylinder Arm In Arm Out The system is really slow... it actually takes 3-4 seconds for the arm to fully extend. An engineer created the below diagram. Start Pressed Time (seconds) Box Falls - 1 -2 -3 - 4 - 5 -6 –7 -8 – 9 – 10 Extend Arm Close Grip Question (finally!). Which statement is completely true regarding this design? It uses the Master Clock scheme. Given this diagram, the arm will probably start to retract before the grip fully closes. O If the arm takes 4 seconds to retract (return), the box will be dropped "mid-flight" It uses the Domino Scheme. Things can't happen in the wrong sequence. It uses the Master Clock…arrow_forward
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