From: g@a.b   
      
   On 20/03/2013 20:57, philkryder at gmail wrote:   
      
   >   
   > What we learned recently is that though the AVERAGE powerfactor is "low" -   
   .5 or less sometimes,   
      
   lots of inductive loads, 0.5 _is_ rather lousy   
      
   > there are SPECIAL PEAK LOAD EVENTS that may last for a few seconds (less   
   than 5) every minute or two.   
      
   what is a SPECIAL peak load event???   
   >   
   >   
   > Coincident with those peak load events, control circuits in the same   
   "neighborhood" - i.e. cicuit need to fire   
     control solenoids for hydraulic controls. The motor is a half-horse   
   120v 60 cycle that drives a hydraulic pump.   
   On average - 95% of the time - there is no load - but, when there is a a   
   solenoid opens a valve to a hydralic motor   
   and then, other solenoids open valves to hydraulic cylinders...   
   >   
   > You can guess where this is going.   
   >   
   >   
   > When the load is applied voltage drops from 120 nominal to 106 or so.   
   Solenoids fail to fire.   
      
   Provide more information re how long the voltage stays low.   
      
   If the voltage drops that much to a constant low 106 volts, then the   
   supply to the motor is dangerously under-dimensioned. Update the supply   
   to a larger cable and fuse. If you are talking about a short time   
   interval (less than 1 seconds) for the voltage drop then that is normal   
   due to the momentary high start current of the motor. The voltage should   
   come up to close to nominal after the motor runs at rated speed. But   
   since you are stating that the solenoids fail to fire, it indicates that   
   the voltage is too low over the time the motor runs...   
      
   //g   
      
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