e2 motors and motor starting #3 contactors and motor starters
TRANSCRIPT
![Page 1: E2 Motors and Motor Starting #3 Contactors and Motor Starters](https://reader035.vdocument.in/reader035/viewer/2022081417/56649ede5503460f94beedc3/html5/thumbnails/1.jpg)
E2 Motors and Motor Starting
#3 Contactors and Motor Starters
![Page 2: E2 Motors and Motor Starting #3 Contactors and Motor Starters](https://reader035.vdocument.in/reader035/viewer/2022081417/56649ede5503460f94beedc3/html5/thumbnails/2.jpg)
© 2005 Refrigeration Training Services - E2#3 Contactors and Motor Starters v1.2 2
Descriptions of Contactors
• Contactors have the following:– Coil (electro-magnet)– Contacts (switch)– Mechanical linkage (armature)
• Contactor sequence of operation:– Coil is energized– Armature pulls in– Contacts close– Power flows through contacts to the load
![Page 3: E2 Motors and Motor Starting #3 Contactors and Motor Starters](https://reader035.vdocument.in/reader035/viewer/2022081417/56649ede5503460f94beedc3/html5/thumbnails/3.jpg)
© 2005 Refrigeration Training Services - E2#3 Contactors and Motor Starters v1.2 3
Symbols for ContactorsSymbols are shown “de-energized” (no power)
with contacts “normally open”
Coil
Single pole
Contact
Double pole
Triple pole
115v 208-230v, 1 208-230v, 3
![Page 4: E2 Motors and Motor Starting #3 Contactors and Motor Starters](https://reader035.vdocument.in/reader035/viewer/2022081417/56649ede5503460f94beedc3/html5/thumbnails/4.jpg)
© 2005 Refrigeration Training Services - E2#3 Contactors and Motor Starters v1.2 4
Visualizing symbols with power on
• The following slide illustrates what happens when the power is turned on
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© 2005 Refrigeration Training Services - E2#3 Contactors and Motor Starters v1.2 5
Contactor coil “energized”
Contacts close
Single pole
Double pole
Triple pole
115v 208-230v, 1 208-230v, 3
Coil Contact
![Page 6: E2 Motors and Motor Starting #3 Contactors and Motor Starters](https://reader035.vdocument.in/reader035/viewer/2022081417/56649ede5503460f94beedc3/html5/thumbnails/6.jpg)
© 2005 Refrigeration Training Services - E2#3 Contactors and Motor Starters v1.2 6
Contactor in Motion
• The following slide is a front view of a contactor
![Page 7: E2 Motors and Motor Starting #3 Contactors and Motor Starters](https://reader035.vdocument.in/reader035/viewer/2022081417/56649ede5503460f94beedc3/html5/thumbnails/7.jpg)
© 2005 Refrigeration Training Services - E2#3 Contactors and Motor Starters v1.2 7
Contactor Operation
L1 L2
T1 T2
LINE
LOAD
Power to Contactor
Power to Load
CONTROL CIRCUIT
Contacts pull in
Control Circuit energized
![Page 8: E2 Motors and Motor Starting #3 Contactors and Motor Starters](https://reader035.vdocument.in/reader035/viewer/2022081417/56649ede5503460f94beedc3/html5/thumbnails/8.jpg)
© 2005 Refrigeration Training Services - E2#3 Contactors and Motor Starters v1.2 8
Contactor Cut-away view
• The side view of a contactor shows how the coil pulls in the armature and closes the contacts
![Page 9: E2 Motors and Motor Starting #3 Contactors and Motor Starters](https://reader035.vdocument.in/reader035/viewer/2022081417/56649ede5503460f94beedc3/html5/thumbnails/9.jpg)
© 2005 Refrigeration Training Services - E2#3 Contactors and Motor Starters v1.2 9
Side View
L1 L2
T1 T2
LINE
LOAD
CONTROL CIRCUIT
![Page 10: E2 Motors and Motor Starting #3 Contactors and Motor Starters](https://reader035.vdocument.in/reader035/viewer/2022081417/56649ede5503460f94beedc3/html5/thumbnails/10.jpg)
© 2005 Refrigeration Training Services - E2#3 Contactors and Motor Starters v1.2 10
L1 L2
T1 T2
LINE
LOAD
Power to Contactor
Power to Load
CONTROL CIRCUIT
Contacts pulled in
Magnetic Coil energized
Side View
![Page 11: E2 Motors and Motor Starting #3 Contactors and Motor Starters](https://reader035.vdocument.in/reader035/viewer/2022081417/56649ede5503460f94beedc3/html5/thumbnails/11.jpg)
© 2005 Refrigeration Training Services - E2#3 Contactors and Motor Starters v1.2 11
Contactor Troubleshooting
• 1st Test: Check the mechanical linkage– Armature must move freely– Burned coils can restrict movement
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© 2005 Refrigeration Training Services - E2#3 Contactors and Motor Starters v1.2 12
Check Coil Linkage
L1 L2
T1 T2
LINE
LOAD
Power to Load
CONTROL CIRCUIT
Close Contacts
Safety tip:Always use wooden dowel
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© 2005 Refrigeration Training Services - E2#3 Contactors and Motor Starters v1.2 13
Contactor Troubleshooting
• 2nd Test: Ohm the contactor coil– 0 ohms means it’s shorted – Infinite ohms (OL) means coil is open– Measurable resistance, coil is good
• Note: If the coil is shorted or open, correct the problem before replacing contactor
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© 2005 Refrigeration Training Services - E2#3 Contactors and Motor Starters v1.2 14
Remove wires
from coil
L1 L2
T1 T2
LOAD
CONTROL CIRCUIT
Checking the Contactor Coil
Measurableresistance is GOOD
OHM Coil123Ω0 Ω
0Ω = Shorted
0L
Infinite Ω = Open
LINE
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© 2005 Refrigeration Training Services - E2#3 Contactors and Motor Starters v1.2 15
Contactor Troubleshooting
• 3rd Test: Check voltage across contacts (voltage must be applied):– 0 volts means contacts are good– Line voltage means contacts are open– Any voltage reading means contacts are
burned
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© 2005 Refrigeration Training Services - E2#3 Contactors and Motor Starters v1.2 16
L1 L2
T1 T2
LINE
LOAD
CONTROL CIRCUIT
Check Voltage Across Contacts
0
Zero is good
NOTE: Any voltage reading across contacts can mean contacts are BAD.
Example:230 Volt Line10 Volts across contacts
10
Replace Contactor
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© 2005 Refrigeration Training Services - E2#3 Contactors and Motor Starters v1.2 17
Motor Starter
• Basically a contactor with overloads
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© 2005 Refrigeration Training Services - E2#3 Contactors and Motor Starters v1.2 18
Motor Starter Diagram
Coil and contacts:
Magnetic overloads:
Overloads open switches on high current draw
Switches are wired in seriesAny switch that opens will interrupt power to the coil
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© 2005 Refrigeration Training Services - E2#3 Contactors and Motor Starters v1.2 19
Motor Starter
Power In
Coil
Power Out
Overloads
Manual Reset
Contacts (inside)
![Page 20: E2 Motors and Motor Starting #3 Contactors and Motor Starters](https://reader035.vdocument.in/reader035/viewer/2022081417/56649ede5503460f94beedc3/html5/thumbnails/20.jpg)
© 2005 Refrigeration Training Services - E2#3 Contactors and Motor Starters v1.2 20