On 1/25/2017 10:07 AM, Mike Kramer wrote:
Mike,
Not needed for SSR, it's simply for those that operate magnetically.
The collapsing magnetic field can produce a very large voltage spike in
the opposing direction -- not a lot of power behind it, which is why the
diode can handle it (while keeping the negative voltage minimal), but
the magnitude of the voltage can damage control circuitry. By
definition, the SSR has no magnetic field that you have to worry about...
David Erbas-White
P.S. It might be that some SSRs would require a diode wired differently
in order to ensure you don't accidentally reverse the polarity, but one
would think that is built in to most SSRs these days.
Do you need the diode for SSR? Or just mechanical coils and relays?
Mike
