SS3 is shorted?  Or triggered by strays.
Most SS Relays have significant current leakage.
The rest of the voltages are correct for SS3 being on.

  *
  |  __O    Thomas C. Sefranek   WA1RHP@ARRL.NET
  |_-\<,_   Amateur Radio Operator: WA1RHP
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> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Edson Brusque (PICList)
> Sent: Friday, January 03, 2003 12:02 AM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: [EE]: Power voltage regulator
>
>
> Hello,
>
>     I'm making a power voltage regulator using an autotransformer
> with various taps and SCRs to select the taps, but it's not
> working as expected.
>
>     Please, take a look at
> http://www.citronics.com.br/brusque/SCR_SSR.png, this is the
> circuit of a Solid State Relay I'm using to select taps, like this:
>
>
>     220V----------+---SSR1----)          note: the various ')' is
>    input          |           )                the autotransformer
>                   +---SSR2----)
>                   |           )
>                   +---SSR3----)
>                               )
>                               )
>                               )-----120V
>                               )     output
>                               )
>     GND-----------------------)-----GND
>
>     Just for testing, I've built the circuit above and connected
> the 220V input to the mains and put a small light bulb (20W) at
> the output. The control input of the SSRs are not connected.
>
>     Well, the strange thing is that even without sending control
> voltages to the SSRs the lamp lights! I'm measuring 110V at the
> lamp, 8.4V across the SSR1, 4.2V across the SSR2 and 0V across the SSR3.
>
>     There's some good explanation for this? I need to build a
> modified SSR?
>
>     Thank you very much,
>
>     Brusque
>
> -----------------------------------------------------------------
> Edson Brusque                 C.I.Tronics Lighting Designers Ltda
> Research and Development               Blumenau  -  SC  -  Brazil
> Say NO to HTML mail                          www.citronics.com.br
> -----------------------------------------------------------------
>
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