[Amps] Solid state relays and step start

[Roger]

TexasRF at aol.com wrote:
>  
> Hi Gary, I have tried using solid state relays in that application with  
> poor reliability. The last attempt was a 70A unit that worked ok for a while 
> but  a flashover in the plate circuit took it out in a shorted condition. The 
> B+ lead  had a 50 ohm current limiting resistor installed but that was not 
> enough. 30A  fuses in the primary also blew.
>   
If need be you can always use a solid state timer to control a 
mechanical relay(s).

73

Roger (K8RI)
>  
> I have since replaced the solid state relay with a 30A mechanical relay and 
>  no further problems have come up.
>  
> 73,
> Gerald K5GW
>  
>  
>  
> In a message dated 3/4/2010 2:53:40 P.M. Central Standard Time,  
> garyschafer at comcast.net writes:
>
> Has  anyone had problems using a solid state relay to short out the step
> start  resistor in a power supply?
>
> I have heard of problems of not enough  current thru the SS relays (when amp
> is in standby) when used as the  primary on/off relay. Sometimes a resistor
> has to be placed in parallel  with the transformer primary so the relay 
> works
> properly.
>
> When used  in a step start circuit the current could be quite low as well as
> the  voltage at the relay due to the resistor across the relay.  Any  issues
> here?
>
> 73
> Gary   K4FMX
>
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