Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Question
Chapter 58, Problem 1SQ
To determine
Draw the major control devices of a programmable controller.
Expert Solution & Answer
Answer to Problem 1SQ
The major control devices of a programmable controller are as follows:
Explanation of Solution
Discussion:
A solid-state, electronic microprocessor-based control system is known as a programmable controller.
A programmable controller contains the following components.
- Power supply.
- Input modules.
- Processor.
- Output modules.
- Programmer.
The input devices such as push buttons, limit switches, and condition sensors are connected to input modules. The input module is monitored by the system to detect changes occurred in the input devices. Depending upon the status of input signals, the controller system reacts using user- programmed internal logic. The response obtained by the controller device is used to drive the output loads such as motor starter, control relays, contactors, and alarms.
The major control devices of a programmable controller are shown in Figure 1.
Conclusion:
Thus, major control devices of a programmable controller are shown in Figure 1.
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A17)
Using Carson's rule, determine the transmission bandwidth for commercial FM radio broadcasting, provided that the maximum value of frequency deviation is 75 kHz and the bandwidth of the audio signal is 15 kHz
2. Laboratory Preliminary Discussion
First-order High-pass RC Filter Analysis
The first-order high-pass RC filter shown in figure 3 below represents all voltages and currents in the time domain. We will again
convert the circuit to its s-domain equivalent as shown in figure 4 and apply Laplace transform techniques.
ic(t)
C
vs(t)
i₁(t)
+
+
vc(t)
R1
ww
Vi(t)
|| 12(t)
V2(t)
R₂
Vout(t) VR2(t) = V2(t)
Figure 3: A first-order high-pass RC filter represented in the time domain.
Ic(s)
C
+
Vs(s)
I₁(s)
+
+
Vc(s)
R₁
www
V₁(s)
12(s)
V₂(s)
R₂
Vout(S)
=
VR2(S)
= V2(s)
Figure 4: A first-order high-pass RC filter represented in the s-domain.
Again, to generate the s-domain expression for the output voltage, You (S) = V2 (s), for the circuit shown in figure 4 above, we can
apply voltage division in the s-domain as shown in equation 2 below. Equation 2 will be used in the prelab computations to find
an expression for the output voltage, xc(t), in the time domain.
equation (2)
R₂
Vout(s) = V₂(s) =
R₂+…
Chapter 58 Solutions
Electric Motor Control
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