From: pallison49@gmail.com   
      
   bobenge...@gmail.com wrote:   
   ===========================   
   >   
   > I have a 24v DC motor that I'm using with a PWM controller supplied by a   
   > 24v SMPS. I want to be able to briefly switch the motor to 48v with a   
   > relay.   
      
   ** Bad idea.   
   Doubling the DC input to a brush motor will quickly destroy it - it may last   
   only a few minutes of such abuse.   
   Over voltage creates severe acing across the segments of the commutator.   
      
   A good rule is to have no more than 2.5V for each pole of a DC motor.   
      
      
   .....  Phil   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)