
Using the schematic diagram in Figure 20–23, determine the number of control wires needed to control the three-phase motor. Use the terminal and wire identification shown in the schematic as well as proper power circuit identification.
FIG. 20–23

Calculate the number of control wires required to control the three-phase motor in Figure 20–23.
Explanation of Solution
The 3 wires are connected to the externally operated disconnect switch, and the switch is connected to pull box through 3 wires. Four wires are used to connect stations 1 and 2. Four wires and three wires are used to connect station 2 and station 3 to pull box, respectively. The pull box is connected to motor starter using 6 wires, and finally, starter is connected to a three-phase motor using 3 wires. Redraw the given figure with the representation of the required control wires as shown in Figure 1.
Conclusion:
Thus, the number of control wires required to control the three-phase motor in Figure 20-23 is calculated.
Want to see more full solutions like this?
Chapter 20 Solutions
Electric Motor Control
- Q5B. Find the type of the controller in the following figures and use real values to find the transfer function of three of them[ Hint Pi,Pd and Lead,lag are found so put the controller with its corresponding compensator]. R₁ R₂ Rz HE C2 RA HE R₁ R2 RA とarrow_forwardQ1// Sketch the root locus for the unity feedback system. Where G(s)=)= K S3+252 +25 and find the following a. Sketch the asymptotes b. The exact point and gain where the locus crosses the jo-axis c. The breakaway point on the real axis d. The range of K within which the system is stable e. Angles of departure and arrival.arrow_forwardDetermine X(w) for the given function shown in Figure (1) by applying the differentiation property of the Fourier Transform. Figure (1) -1 x(t)arrow_forward
- Can you solve a question with a drawing Determine X(w) for the given function shown in Figure (1) by applying the differentiation property of the Fourier Transform. Figure (1) -1 x(t)arrow_forwardAn inductor has a current flow of 3 A when connected to a 240 V, 60 Hz power line. The inductor has a wire resistance of 15 Find the Q of the inductorarrow_forwardصورة من s94850121arrow_forward
- The joint density function of two continuous random variables X and Yis: p(x, y) = {Keós (x + y) Find (i) the constant K 0 2 0arrow_forwardShow all the steps please, Solve for the current through R2 if E2 is replaced by a current source of 10mA using superposition theorem. R5=470Ω R2=1000Ω R6=820Ωarrow_forwardPlease solve it by explaining the steps. I am trying to prepare for my exam tomorrow, so any tips and tricks to solve similar problems are highly appreciated. Plus, this is a past exam I am using to prepare.arrow_forwardPlease solve it by explaining the steps. I am trying to prepare for my exam today, so any tips and tricks to solve similar problems are highly appreciated. Plus, this is a past exam I am using to prepare.arrow_forwardIf C is the circle |z|=4 evaluate f f (z)dz for each of the following functions using residue. 1 f(z) = z(z²+6z+4)arrow_forwardIf C is the circle |z|=4 evaluate ff(z)dz for each of the following functions using residue. f(z) z(z²+6z+4)arrow_forwardarrow_back_iosSEE MORE QUESTIONSarrow_forward_ios
