nuckolls.bob(at)aeroelect
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 Posted: Fri Jan 13, 2023 2:05 pm Post subject: is this a MOV and should I remove or replace it? |
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At 01:44 PM 1/13/2023, you wrote:
| Quote: | --> AeroElectric-List message posted by: "johnbright" <john_s_bright(at)yahoo.com>
And note that Bob Nuckolls teaches us to put the flyback suppression diode across the contactor or relay's coil, not the switch to the coil. I mention this because the OP's schematic from 1993 shows the MOV across the switch. |
Yeah, that was sort-of-the-way you could
protect the switch's opening contacts with
a device that clamped the arc-energy to a
dozen or so volts . . . but again, fuzzy
thinking based on poor understanding of
the MOV's physics.
So yeah, spike suppression belongs across
the inductive source . . . not across any
switch to be protected. If the MOV had been
a bit more sophisticated, mounting it across
the switch was more convenient from the
installer's perspective but that bubble
popped and blew away.
The schematic citing a switch mounted
MOV was one of mine.
Bob . . .
Un impeachable logic: George Carlin asked, "If black boxes
survive crashes, why don't they make the whole airplane
out of that stuff?"
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