Wow, I don’t know about others, but I learned a bunch on this thread!!! I’m
considering connections, batteries and power arrangements, and now learning
about these solenoids I picked up. BTW: I searched for info on the solenoids
and even called the manufacturer but it’s a discontinued product with no
documentation. So, I appreciate the info. I want to use the solenoids to
control pneumatics for retractable legs. Basically, ground launch the rocket
with the legs extended and bring them in as the rocket accelerates. The fins
would be on the ends of the legs.
Anyway, that’s the plan. And, I thought I was busy when I was working. ??
Richard Dierking
From: Vern Knowles<mailto:knowles.vern@xxxxxxxxx>
Sent: Wednesday, January 25, 2017 12:14 PM
To: roc-chat@xxxxxxxxxxxxx<mailto:roc-chat@xxxxxxxxxxxxx>
Subject: [roc-chat] Re: Resistance for Electric Matches
I would caution against removing the diode. An SSR has no magnetic field but
the solenoid does! The diode is there to prevent the voltage spike generated
by the solenoid from damaging the SSR.
Vern
From: roc-chat-bounce@xxxxxxxxxxxxx [mailto:roc-chat-bounce@xxxxxxxxxxxxx] On ;
Behalf Of David Erbas-White
Sent: Wednesday, January 25, 2017 11:13 AM
To: roc-chat@xxxxxxxxxxxxx
Subject: [roc-chat] Re: Resistance for Electric Matches
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
