Enabling through a solid state relay

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13 Jun 2022 13:35 #245070 by Kylizer
I am trying to turn power on and off to my amps through a Solid state relay and 7i97 Enable+/-. I know this is not the proper way to set this up but it is just temporary and it helps me understand. I know I need to run this through and emergency push buttom kill switch though. I was just wondering if someone could verify my diagram or not? 
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13 Jun 2022 13:46 #245072 by PCW
That should work

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13 Jun 2022 18:19 #245082 by tommylight
Is it an AC or DC SSR?
AC will not work for switching DC, well it will but it will not switch off.

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14 Jun 2022 13:46 #245120 by Kylizer
             Well I left out a few things and here is actually how it is
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14 Jun 2022 15:25 #245129 by Kylizer
do you see any problems with it like this?

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15 Jun 2022 20:48 #245226 by andypugh
It should be fine, though if the capacitor is large you might find that you trip the RCD / GFCI is there is one on the circuit.

What is the amp? (ie what type)

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16 Jun 2022 19:41 #245283 by robertspark
with my transformers I use an ntc thermistor to compensate against the inrush current (one is 800w and the other is about 450w supplied from a 32A type C circuit breaker)

product.tdk.com/en/techlibrary/applicati...wto_ntc-limiter.html

I don't like using SSRs in this sort of application and prefer a electro/mechanical contactor (high current relay)

the reason being is because an SSR normally looses the a bit of the AC waveform before the triac fires (even with a SSR which have a zero crossing firing triac

a SSR also does not actually go fully off.... there is a leakage current, this is not normally a problem, just don't ever work electrically on the output of the SSR and disconnect a wire while it is live upstream.

hence I like a contactor in most applications as it is a positive (full) disconnection device.

www.ia.omron.com/product/cautions/18/safety_precautions.html


appreciate everyone does their own thing but it's best to understand all the pros and cons, then you can make an informed decision
The following user(s) said Thank You: itsme

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16 Jun 2022 21:25 #245288 by Kylizer
they are glenteck SMA7215

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16 Jun 2022 23:31 #245291 by robertspark
you probably want to be very careful with the DC side of that circuit.

120v AC becomes almost 170v DC.

I have had a lot of shocks with 240v AC over the years (used to be an electrician / technician). only a DC belt came close to killing me which was an emergency lighting circuit. AC will tend to throw you away but DC will hold your muscles in spasm which is what happened to me, had I not been working with another quick acting spark I would not be here who just charged at me.

be very careful and give the capacitor time to discharge and or check it's discharged with a crowbar test.

big boy pants required

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16 Jun 2022 23:46 #245292 by tommylight
Pretty sure that:
AC to DC converter = 72V switch mode power supply
or ?

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