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PowerPoint to Accompany Lessons in
Electrical Controls PowerPoint to Accompany Lessons in AAVIM, Electrical Controls Textbook by Dr. James Allison PowerPoint Developed by Sidney Bell
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Control Circuit Ladder Diagram
240 V single phase motor for a feed bin auger, controlled by a push button station, normally open limit switch and normally open motor relay
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Normally Open Limit Switch (N.O.)
Door closed Door open Limit switch Limit switch
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Push Button Station Normally Open START Normally Closed STOP
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Normally Open Auxiliary Contacts
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Motor Contactor C 120 V Coil
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DPST NO Relay (Contactor)
Coil T1 T2 Auxiliary Contact M
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L1 L2 T1 T2 N M
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N L1 L2 T1 T2 M
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DPST - NO Magnetic Starter 240V Coil
1 3 X1 X2 2 DPST - NO Magnetic Starter 240V Coil (Relay with an overload sensing component) NEC &
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M1 M2 L1 L2 Ladder diagram of hammer mill and auger control circuit TD
THERMAL TIME DELAY Ladder diagram of hammer mill and auger control circuit
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L2 1 MOTOR 2 TD THERMAL TIME DELAY L1
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Hammer mill Auger L1 L2 TD THERMAL TIME DELAY MOTOR 2 MOTOR 1 L2 L2 1
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Two 240 V Lamps Controlled by Mechanical Timers
Lamps – 240 V
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