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Relays are available with different coil voltages and contact options. LiftMaster’s line of commercial operators primarily
use Double Pole/Double Throw Relays. A pole is another name for a switch. Double Pole is two separate switches
being turned on or off by the same activation coil (two separate Comms, NCs and NOs). Double Throw means there are
two positions for the output (NO and NC). When shopping for relays, Triple Pole/Single Throw and Single Pole/Double
Throw and many other options are available. Relays are rated with specifi c amp and voltage ratings. Always replace a
relay with the same ratings.
When looking at a wiring schematic, relays will be drawn with several components and the name of the relay will be
noted.
Here is the same relay light switch shown as a wiring schematic.
NO
Switch
Battery
AC Power Source
Light Bulb
R1
R1
R1
R1
R1
The Coil
The NC Contacts
The NO Contacts
D
Basic Electrical Information
Relays
Summary of Contents for K001A5729
Page 1: ...For more information please visit www devancocanada com or call toll free at 855 931 3334...
Page 4: ...4 Page Basic Troubleshooting 5 SECTION A Table of Contents...
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Page 34: ...Page Symptoms And Solutions 35 Mechanical Operators SECTION C Table of Contents...
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Page 62: ...62 WARNING F Wiring Diagrams Mechanical Operator Single Phase...
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