Searching \ for '[OT ] Problem turning off a solid state relay' in subject line. ()
Make payments with PayPal - it's fast, free and secure! Help us get a faster server
FAQ page: www.piclist.com/techref/io/motors.htm?key=relay
Search entire site for: 'Problem turning off a solid state relay'.

Exact match. Not showing close matches.
PICList Thread
'[OT ] Problem turning off a solid state relay'
2000\04\15@102340 by Stuart

flavicon
face
I've got a couple of solid state relays that I would like to put to use but
I've got a problem with them at the moment, I can't turn them off
completlely. I've got 240 volts hooked up to one and I can turn it on using
5 volts DC. The voltage drop across it's terminals is only 2 volts when
turned on and when I turn it off instead of the voltage being 240 volts
across it's terminals it is 120 volts so therefore it's only half switching
off. Does anyone have an idea as to whats wrong?
Thanks in advance
Regards
Stuart

P.S. I'll be using a PIC to drive this

2000\04\15@113101 by Arthur

flavicon
face
yes they are SCR or TRIAC 's and you are measuring leakage
Art
spam_OUTartbTakeThisOuTspamcableinet.co.uk
----- Original Message -----
From: Stuart <.....pigKILLspamspam@spam@AR.COM.AU>
To: <PICLISTspamKILLspamMITVMA.MIT.EDU>
Sent: Saturday, April 15, 2000 3:22 PM
Subject: [OT ] Problem turning off a solid state relay


> I've got a couple of solid state relays that I would like to put to use
but
> I've got a problem with them at the moment, I can't turn them off
> completlely. I've got 240 volts hooked up to one and I can turn it on
using
> 5 volts DC. The voltage drop across it's terminals is only 2 volts when
> turned on and when I turn it off instead of the voltage being 240 volts
> across it's terminals it is 120 volts so therefore it's only half
switching
> off. Does anyone have an idea as to whats wrong?
> Thanks in advance
> Regards
> Stuart
>
> P.S. I'll be using a PIC to drive this

2000\04\15@122753 by ke

flavicon
face
-----Original Message-----
From: Stuart <.....pigKILLspamspam.....AR.COM.AU>
To: EraseMEPICLISTspam_OUTspamTakeThisOuTMITVMA.MIT.EDU <PICLISTspamspam_OUTMITVMA.MIT.EDU>
Date: den 15 april 2000 16:22
Subject: [OT ] Problem turning off a solid state relay



The most of the solid state relays needs a minimum
at 3V DC trigger voltage, and you have 2V ?
So what you have to do is advance the voltage to
minimum 3 V DC and maybe the capacity of your
source of power.

Regards
keN



{Quote hidden}

2000\04\15@122954 by Reginald Neale

flavicon
face
<x-flowed>>I've got a couple of solid state relays that I would like to put to use but
>I've got a problem with them at the moment, I can't turn them off
>completlely. I've got 240 volts hooked up to one and I can turn it on using
>5 volts DC. The voltage drop across it's terminals is only 2 volts when
>turned on and when I turn it off instead of the voltage being 240 volts
>across it's terminals it is 120 volts so therefore it's only half switching
>off. Does anyone have an idea as to whats wrong?

  Assuming that they are AC SSRs, there are two potential
  problems. You didn't say what kind of load you're testing
  it with. They don't like inductive loads (transformers,
  motors) and they also may not behave properly below some
  minimum load. Try it with a 100W lamp load and see what
  happens. It's OK to use 120 VAC for the test.

  Reg Neale

</x-flowed>

2000\04\15@231048 by Giles

picon face
Use DC SSRs for DC.. :)  They are most likely looking for the 0 crossing and
never seeing it.
I think the SSRs you have are for AC loads.. If they are rated at 110 or
higher, hook a AC lamp up and see if they work.
Best regards,
Giles
{Original Message removed}

2000\04\19@201514 by Edson Brusque

face
flavicon
face
Hello,

   as we're talking about SSRs, someone knows if there's any SSR that works
with AC but can be turned off in any point (not zero-crossing)? At high rate
(above 20KHz)?

   Best regards,

   Brusque

2000\04\19@215909 by Fansler, David

flavicon
face
By their very nature, SSR's and Triac's will only turn off on a zero
crossing of the AC power feed.  This is why they are non-applicable to DC
circuits.  You can only control when they are turned on.

David V. Fansler
Network Administrator
TriPath Imaging, Inc. (formerly AutoCyte, Inc.)
@spam@DfanslerKILLspamspamautocyte.com <KILLspamDfanslerKILLspamspamautocyte.com>
336-222-9707 Ext. 261
Now Showing!  http://www.dv-fansler.com <http://www.dv-fansler.com>
Last updated March 31, 2000
Ann's Cancer, David's Observatory, Trip to Disney


               {Original Message removed}

2000\04\19@234347 by Giles

picon face
If you can find one rated for AC or DC loads, then you will do fine.
Good luck,
Giles
----- Original Message -----
From: Edson Brusque <RemoveMEbrusqueTakeThisOuTspamFLYNET.COM.BR>
To: <spamBeGonePICLISTspamBeGonespamMITVMA.MIT.EDU>
Sent: Wednesday, April 19, 2000 6:59 PM
Subject: Re: [PICLIST] [OT ] Problem turning off a solid state relay


> Hello,
>
>     as we're talking about SSRs, someone knows if there's any SSR that
works
> with AC but can be turned off in any point (not zero-crossing)? At high
rate
> (above 20KHz)?
>
>     Best regards,
>
>     Brusque
>

2000\04\20@044359 by Alan B Pearce

face picon face
>By their very nature, SSR's and Triac's will only turn off on a zero
>crossing of the AC power feed.  This is why they are non-applicable to DC
>circuits.  You can only control when they are turned on.

Unless you use a "Gate Turn Off" SCR where you do force the device to stop
conducting by a signal on the gate. I have not used any of these, but do
remember seeing datasheets for the early ones made by RCA. They did require some
hefty drive signal into the gate to turn them off. I believe they have improved
in gate turn off sensitivity since then, but do not have any figures.

2000\04\20@055838 by Arthur

flavicon
face
The problem is that it's still the leakage voltage through device that you
can measure i.e. 120v if supply is 240v. The meter you are using is also in
the meg range put a lamp across the load and the take reading.
Art
{Original Message removed}

2000\04\20@094611 by Marcelo Yamamoto

flavicon
face
Try a GTO
http://www.westcode.com/ws-gto.html

Marcelo Y.

Brusque wrote:

>Hello,
>
>    as we're talking about SSRs, someone knows if there's any SSR that
works
>with AC but can be turned off in any point (not zero-crossing)? At high
rate
>(above 20KHz)?
>
>    Best regards,
>
>    Brusque
>

2000\04\20@112011 by Quitt, Walter
flavicon
face
Crydom brand SSRs comes to mind.

-----Original Message-----
From: Edson Brusque [TakeThisOuTbrusqueEraseMEspamspam_OUTFLYNET.COM.BR]
Sent: Wednesday, April 19, 2000 4:59 PM
To: RemoveMEPICLISTspamTakeThisOuTMITVMA.MIT.EDU
Subject: Re: [OT ] Problem turning off a solid state relay


Hello,

   as we're talking about SSRs, someone knows if there's any SSR that works
with AC but can be turned off in any point (not zero-crossing)? At high rate
(above 20KHz)?

   Best regards,

   Brusque

More... (looser matching)
- Last day of these posts
- In 2000 , 2001 only
- Today
- New search...