Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 2, Problem 5SQ
To determine
Explain about the consequence when the heater element is not installed in a two-pole manual starter.
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Can you please explain in details so I can understand even better.
Topic: Electrical Machines
Explain the characteristics and how the following motor starters work. 1.Slip Ring a. Variable Resistance b. Fixed Starting Resistance
c) Based on Figure 3 (c), a basic DOL starter induction motor at a power station is
experiencing run-time error and unable to start, based on your understanding,
interpret the sequence of troubleshooting shall be carried out to identify the root
cause of the abnormalities.
3P
1P
MCB
MCB
STOP
K1
START
MOTOR
Figure 3 (c)
Chapter 2 Solutions
Electric Motor Control
Ch. 2 - If the contacts on a manual starter cannot be...Ch. 2 - If the handle of an installed motor starter is in...Ch. 2 - How may an automatic operation be achieved when a...Ch. 2 - What does the term trip-free mean as it relates to...Ch. 2 - Prob. 5SQCh. 2 - Prob. 6SQCh. 2 - Prob. 7SQCh. 2 - Prob. 8SQCh. 2 - Select the best answer for each of the following....Ch. 2 - Select the best answer for each of the following....
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- What is meant by the low or poor starting economy of a primary resistor starter?arrow_forwardWhich is correct for Question 3?arrow_forwardA 55 hp, 440 V, 400 rpm DC shunt motor draws 107 A when operating at rated conditions. The motor has an armature-circuit resistance of 100 mW and a total field-circuit resistance of 55 W. (vii) What is the motor no-load speed if the no load induced voltage is 440.85V? 390 rpm 395 rpm 400 rpm 405 rpm 410 rpm (viii) What would be the starting line current if the motor was started at full-voltage? 4107 A 4255 A 4392 A 4400 A 4408 A (ix) What is the motor full-voltage starting line current if a 1.9Ω starting resistor is connected in series with the armature? 212 A 220 A 228 A 6 A 6 Aarrow_forward
- When a d-c motor is tested by the electrical input method, the field rheostat is adjusted to giveA. rated speed at full load.B. rated speed at no load.C. maximum speed at minimum load.D. minimum speed at maximum load. Note: I have doubts if it is the letter A or the letter B, can you help me in this question, thanks.arrow_forward٢٢arrow_forwardQuestion 4 A 55 hp, 440 V, 400 rpm DC shunt motor draws 107 A when operating at rated conditions. The motor has an armature-circuit resistance of 100 m2 and a total field-circuit resistance of 55 2. Draw a schematic of the motor in the space below showing all known quantities (resistances, currents, voltages and load). Show only symbols for unknowns. Determine the following for rated operation What is the motor armature current? (a) 99 A (b) 102 A (c) 107 A (d) 110 A (e) 115 A (i) What is the CEMF developed in the armature? (a) 449.9 V (b) 440.0 V (c) 430.1 V (d) 429.3 V (e) 428.5 V (i) What is the total windings (copper) losses in the motor? (a) 4842.5 W (b) 4500.1 W (c) 3520 0 W (d) 1145 W (e) 980.1 Warrow_forward
- If the starter resistance is 1.9 ohms, what current does the motor take at the instant of starting in a shunt motor rated 25-hp. 230-volt, 600-rpm having armature and a field resistance of 0.275 ohm and 160 ohms, respectively. (Assume a 2-volt brush drop)arrow_forwardWhich one of the following is not a part of an induction motor? a. Starter b. Rotor c. Stator d. Terminal Box e. Frame/Yoke f. Bearing g. Shaftarrow_forwardDetermine the value of starting resistance of the 7.5 kW, 220 V shunt motor so thatthe current will not exceed 2 times of the motors full load rating. The armature andfield resistance is 0.24 and 101 ohms respectively. The motor efficiency is 95%arrow_forward
- Explain how does the current will be reduced during the starting of the motor.arrow_forwardElectrical engineering subject of electrical machines/ I need a correct and accurate solutionarrow_forwardQ/ When a series dc motor is operated without a load, which of the following conditions occurs? * Ans 1- The armature draws excessive current 2- The armature speeds out of control 3- The armature will not turn 4-The voltage requirement increasesarrow_forward
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