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School
Hennepin Technical College *
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Course
1155
Subject
Industrial Engineering
Date
Dec 6, 2023
Type
Pages
7
Uploaded by ConstableThunder11765
MANUAL STARTERS
1-24
BASIC CONTROLS
F
Procedure Summary
In the first part of this exercise, you will examine the Manual Starter and determine
that it has both the power contacts and the overload protection necessary to be
called a motor starter. You will then test the Manual Starter with push buttons and
pilot lights, and see that power lines are not reversed by the device, making it a
DOL starter.
In the second part of the exercise, you will inspect the Cam Switch to find out that
it does not include an overload relay, and hence, cannot be considered a motor
starter. After that, you will connect the Cam Switch to push buttons and pilot lights,
and see that two power lines are inverted when switching between the forward and
the reverse modes. You will observe that the Cam Switch can thus be part of a
reversing starter.
Industrial Controls Training System
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MANUAL STARTERS
BASIC CONTROLS
1-25
EQUIPMENT REQUIRED
Refer to the Equipment Utilization Chart in Appendix A to obtain the list of equipment
required for this exercise.
PROCEDURE
The AC Power Supply provides high voltages. Do not change any
AC connection with the power on.
Basic setup
1.
Perform the Basic Setup and Lockout/Tagout procedures.
Direct-on-line (DOL) starter
2.
Examine the Manual Starter module. What is the range of the Manual
Starter overload (indicated on the module faceplate)?
Overload current range:
3.
What is the purpose of the black knob on the Manual Starter?
4.
What is the purpose of the yellow potentiometer on the Manual Starter?
5.
Is it appropriate to call this device a motor starter? Explain why.
Industrial Controls Training System
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1.6~2.5
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energise the coil to activate the contacts
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adjust the amount of current
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Yes you the power lines coming into the starter with contacts going out.
MANUAL STARTERS
1-26
BASIC CONTROLS
6.
Connect the circuit shown in Figure 1-11.
Figure 1-11.
Basic manual starter circuit.
Industrial Controls Training System
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MANUAL STARTERS
BASIC CONTROLS
1-27
7.
Set the knob of the Manual Starter to the O position.
Perform the Energizing procedure.
8.
Set the knob of the Manual Starter to the I position.
9.
Find out which lights illuminate when you press the push buttons. Fill out
Table 1-2 for all three push buttons.
PUSH BUTTON
PRESSED
PILOT LIGHT ILLUMINATED
AL
BL
CL
A
B
C
Table 1-2. Target table of a DOL starter.
10.
What type of starter is it?
DOL starter
Reversing starter
11.
Perform the Lockout/Tagout procedure.
Cam switch reversing circuit
12.
Examine the Cam Switch module. Does this module permit on and off
switching?
Yes
No
13.
What are the operating modes of this module?
14.
Does the Cam Switch incorporate an overload relay?
Yes
No
Industrial Controls Training System
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x
x
x
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forward, reverse, stop
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MANUAL STARTERS
1-28
BASIC CONTROLS
Figure 1-12. Cam Switch reversing circuit.
Industrial Controls Training System
V21113
MANUAL STARTERS
BASIC CONTROLS
1-29
15.
Is it appropriate to call this device a motor starter? Explain why.
16.
Connect the circuit shown in Figure 1-12.
17.
Perform the Energizing procedure.
18.
Find out which pilot lights illuminate when you press the push buttons. Fill
out Table 1-3 for all three push buttons in FWD, STOP, and REV modes.
PUSH BUTTON
ACTUATED
CAM SWITCH
POSITION
PILOT LIGHT ILLUMINATED
AL
BL
CL
A
FWD
STOP
REV
B
FWD
STOP
REV
C
FWD
STOP
REV
Table 1-3. Target table of the Cam Switch.
19. Compared to the FWD mode, which lines have been switched in the
REV mode?
1 and 2
1 and 3
2 and 3
None
20. What type of starter can be constructed with the Cam Switch and an
appropriate overload relay?
DOL starter
Reversing starter
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Yes still powering up loads
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x
o
o
o
o
o
o
x
o
o
x
o
o
o
o
x
o
o
o
o
x
o
o
o
o
o
x
✔
✔
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MANUAL STARTERS
1-30
BASIC CONTROLS
21.
Turn the individual power switch of the AC Power Supply off, disconnect the
circuit, remove the magnetic labels, and return the equipment to the storage
location.
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Date
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