Hi Bob, I notice on your wiring schematics the
inclusion of a diode between the large + and small
terminals on the contactor.
What is the reason for this and what type of diode is it.
John,
The solenoid coil that provides a force to close
the contactor is an "inductive" load capable of
storing electrical energy. The energy is dumped back
into the system in the form of a high voltage
spike when the switch that controls the contactor
is opened. You'll see a diode across the coil
terminals of all contactors in our diagrams. Take
a peek at the photograph on our website at:
http://www.aeroelectric.com/Catalog/switch/s701-1l.jpg
This shows how we install the diode on contactors we
sell that do not have them built in. The intermittant
duty starter contactors we sell have this diode
built in.
Just about any diode rectifier will work. 1N4000 series
devices are electrically capable of doing the job. The
diode you see in my photo is a 1N5400 series device
selected because it's mechanically more robust.
Bob . . .
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( The only time you don't fail is the last )
( time you try something, and it works. )
( One fails forward toward success. )
( C.F. Kettering )
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http://www.aeroelectric.com
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