R.S. Electronic Controls, Inc.

 

					
		

	

	


EDC / Submersible Pump Control Wire Isolation Systems

for

Service Stations, Truck Stops and Commercial Fueling Sites.












Frequently Asked Questions







    
Why do I need your
    EDC?

    
What is feedback?

    
Is your EDC UL Listed?

    
Can
    I use your EDC with electronic line leak detection systems?

    
Can
    I use your EDC with Stage II vapor recovery systems such as
    Healy and Hastech?

    
Can
    I use your EDC with the new variable speed submersibles that
    are on the market?

    
Can
    I use your EDC with Red Jacket Big flow submersibles?

    
Is
    this EDC included with my dispensers?

    
How
    are submersible pumps wired when your EDC is not used?

    
Is
    wiring without isolation a problem?

    
Do I need to
    be certified to install your EDC?






    
Why do I need your EDC?



        
There are several reasons

        

			
bulletSafety.  By using our EDC Feedback in submersible
                control wiring can be eliminated. Feedback has
                caused personal injury and about 25% of printed
                circuit board failures.

			
bulletWhen feedback is eliminated any dispenser can be
                repaired without shutting down an entire service
                station or truck stop

			
bulletOnboard diagnostics can be used for trouble
                shooting without tools or meters.

			
bulletThe EDC can be used to trouble shoot other
                equipment that may be connected to it.

			
bulletSimplifies OSHA Lockout Tagout and NFPA 30A
                servicing procedures.

		



    
What is feedback?



    
In a service station, feedback is created in the submersible pump
    control wiring when there is more than one dispenser for any product.

  
When a dispenser is activated by a customer a 120 volt signal is sent to
  the submersible pump motor relay via the submersible pump control
  wiring.   So that any dispenser of the same product can energize the motor
  relay, (to pump fuel) all the wires for the same product are connected
  together at the submersible pump motor relay.   Because of this common
  connection feedback is created in the submersible pump control wiring of any
  dispenser that has not been activated by a customer.

  
Click to view a
  article that appeared in  Petroleum Equipment & Technology magazine.



    
Is your EDC UL Listed?

    

        
Yes, UL File No. E100900, Auxiliary Devices, Motor
        Controllers, Pilot Duty.

    

    
Can
    I use your EDC with electronic line leak detection systems?

    

        
Yes, our EDC eliminates the false pump on signals to
        line leak detection systems and simplifies LLD repairs.

    

    
Can
    I use your EDC with vapor recovery systems such as
    Healy and Hastech?

    

        
Yes, and some of the wiring needed for these systems
        can be simplified or incorporated into our EDC.

    

    
Can
    I use your EDC with the new variable speed submersibles that
    are on the market?

    

        
Yes. The controllers for these submersible pumps are sensitive and may not shut off the submersible pump.   Our EDC can cure this problem because of its isolation and
        ability to pull stray voltages down to a normal level.

    

    
Can
    I use your EDC with Red Jacket Big flow submersibles?

    

        
Yes, but you must add an external relay with 120 volt
        coil. Our EDC controls the relay, and the relay contacts
        control the submersible motor starter.

    

    
Is
    this EDC included with my dispensers?




        
No, dispenser manufactures do not include a means of 
		isolation for submersible control wiring.   Dispenser
        manufacturers have also simplified their equipment to
        keep prices down, and by doing this they have eliminated
        the relay boxes (used for isolation) that were included
        in earlier systems.




    
How
    are submersible pumps wired when your EDC is not used?



        
A relay is used to control each submersible pump, and
        that relay is controlled by the submersible control
        wire(s) from each dispenser.   None of this wiring is
        isolated.



    
Is
    wiring without isolation a problem?




        
YES!   One dispenser is OK, but when there is more than
        one dispenser, feedback is created in the submersible
        control wiring.   Feedback will make any dispenser hot that
        is normally off if any other dispenser of the same
        product is turned on.




        
Do I need
        to be certified to install your EDC?



        
No.   If you need a letter stating so click here.







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