1. Refer to the circuit shown in Figure 27–2. Would it be possible to replace the hand-off-auto switch in this circuit with a hand-off-auto switch that contained a common terminal and center Off position like the HOA switch shown in Figure 27–1? Explain your answer. L1L2L3MOLHTRMOLHTRMOTORMOLHTRSTATSTOPHANDCONTROL TRANSFORMERHANDFigure 27-3 Push-button control station with hand-off-autoswitch and pilot light. (Source: Delmar/Cengage Learning.)OFFAUTOFigure 27-1 Hand-off-automatic switch provides manual controlof a motor or control can be provided by a float switch. (Source:Delmar/Cengage Learning.)double-throw switch with a common terminal, a nor-mally open terminal, and a normally closed terminalin this circuit. Notice that one terminal of both thenormally open switch and normally closed switch areCONTROL.TRANSFORMERHOA1-2 x 003-4 00xHOASTARTSTOPOL1FS1aloM1M2OL2TEMP 1M2Figure 27-2 A water-cooled motor must have a flow of water before it is permitted to run. (Source: Delmar/Cengage Learning.)

and-off-automatic (HOA) controls are used to allow an operator to force a contact on, force it off…

Answered: Refer to the circuit shown in Figure…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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1. Refer to the circuit shown in Figure 27–2. Would it be possible to replace the hand-off-auto switch in this circuit with a hand-off-auto switch that contained a common terminal and center Off position like the HOA switch shown in Figure 27–1? Explain your answer.

L1
L2
L3
M
OLHTR
M
OLHTR
MOTOR
M
OLHTR
STAT
STOP
HAND
CONTROL TRANSFORMER
HAND
Figure 27-3 Push-button control station with hand-off-auto
switch and pilot light. (Source: Delmar/Cengage Learning.)
OFF
AUTO
Figure 27-1 Hand-off-automatic switch provides manual control
of a motor or control can be provided by a float switch. (Source:
Delmar/Cengage Learning.)
double-throw switch with a common terminal, a nor-
mally open terminal, and a normally closed terminal
in this circuit. Notice that one terminal of both the
normally open switch and normally closed switch are
CONTROL.
TRANSFORMER
HOA
1-2 x 00
3-4 00x
HOA
START
STOP
OL1
FS1
alo
M1
M2
OL2
TEMP 1
M2
Figure 27-2 A water-cooled motor must have a flow of water before it is permitted to run. (Source: Delmar/Cengage Learning.)

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