Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 19, Problem 3SQ
To determine
Draw the lines to connect the components in Figure 19-12(B) by the use of Figure 19-12(A).
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Two shunt generators and a battery are all connected to common bus-bars. The open circuit voltage of the battery is 247 V. The open circuit voltage, armature and field resistances of the generators are 250 v, 0.12 ohms and 100 ohms respectively. Both the generators supply the same current when the load on the bus-bars is 40 A. Calculate the internal resistance of the battery.
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An X1 volt,(122V) relay has an inrush rating of 700VA and a hold-in rating of 150VA.
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19.a. The easiest place to install an ammeter into a stepper motor driver/motor circuit for system diagnosticsis toA. remove a fuse and place the meter leads across the fuse clips.B. connect the meter across the center tap and phase leads of the motor.C. attach the meter in series with the driver’s power supply lead.D. disconnect a motor lead and attach the meter in series with that lead.19.b. A servo system is oscillating at standstill. This is an indication thatA. the system gain is too high.B. a driver fuse is blown.C. the following error limit has been exceeded.D. a motor winding is open.
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- The horn circuit is being discussed. Technician A says if the circuit does not use a relay, the horn switch carries the total current requirements of the horns. Technician B says most systems that use a relay have battery voltage applied to the lower contact plate of the horn switch and the switch closes the path for the relay coil. Who is correct? A. A only B. B only C. Both A and B D. Neither A nor Barrow_forwardIf the fault current is 2 kA, the relay setting is 50 % and the CT ratio is 400/5, then what is the plug setting multiplayer of the relay?arrow_forwardAs illustrated in your reading material, the plug-in busway for motor Branch circuits has tap- off openings every_inches. A. 6 b. 10 c. 12 d.16arrow_forward
- in the conduit diagram shown in figure 17-3 determine how many wires are in each conduit between each piece of equipment.identify each wire terminal connection and quantity of wires above the disconnect switch, as shown in the example? based on electric motor control 1th edition by sthephen l. hermanarrow_forwardRefer to the chart in Figure 195. When the switch is set in the off position, are contacts 5 and 6 open or closed? Fig. 195 Selector switch with multiple double-break contacts.arrow_forwardTechnician A says when testing the voltage output, if the charging voltage is too high, the cause could be an open field wire from the regulator. Technician B says a loose or glazed drive belt could be the cause of too high charging voltage. Who is correct? A only B only Both A and B Neither A or B Technician A says that poor connection at the generator output wire can cause charging systems problems. Technician B says that many charging system circuits contain a circuit protection device. Who is correct? A only B only Both A and B Neither A or Barrow_forward
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- Sump pumps and fill tanks have different wiring requirements for control components.arrow_forwardRefer to the circuit shown in Figure 6016. The motor will not start in either the forward or reverse direction when the start push buttons are pressed. Which of the following could not cause this problem? a. The F coil is open. b. The overload contact is open. c. The control transformer fuse is blown. d. The stop push button is not making a complete circuit.arrow_forwardThe control circuit is used to detect and count the number of products being carried on an assembly line. When it counts five products, the circuit energizes a solenoid. The solenoid is energized for a period of two seconds and is then shunts off, causing it to retract? Note: Correct and detailed answer will be Upvoted else downvoted. Thank you!arrow_forward
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