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Power for 12v water pump

Discussion in 'General Electronics Discussion' started by gmagic911, Aug 12, 2015.

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  1. gmagic911

    gmagic911

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    Aug 12, 2015
    I have a water pump that is powered with a 120v/12v converter with an output = 12v 830mA. It will not run when connected to a converter with 12v 6 amp output. What needs to be done so it can be powered with this converter? The pump instructions indicate "The pump is to be supplied through a residual current device with a rated residual operating current not exceeding 30mA."
     
  2. duke37

    duke37

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    Jan 9, 2011
    I do not know what you mean by 'convertor'.
    It could be a transformer giving 12V AC or a power supply giving 12V DC.
    The pump may be fussy as to the power. A universal motor (simple electric drills) can often be run on either AC or DC.

    The residual current breaker should be positioned at the power socket and is to protect you from severe shocks.
     
  3. gmagic911

    gmagic911

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    Aug 12, 2015
    The converter or trsnsformer changes 120 volt ac to 12 volts ac. As stated the pump operates ok with the lower output.
     
  4. Bluejets

    Bluejets

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    752
    Oct 5, 2014
    Yes but is your replacement power supply AC or DC to match the original.
     
  5. Minder

    Minder

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    Apr 24, 2015
    As others have mentioned, you do not state what the supplys or pump is, AC? DC?
    There is probabally no earth conductor this is the reason for a required RCD or GFI.
    M..
     
  6. gmagic911

    gmagic911

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    Aug 12, 2015
    The pump is 12v dc and both transformers convert 120v ac to 12v dc.
     
  7. Alec_t

    Alec_t

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    Jul 7, 2015
    A transformer and a converter are not the same thing. A transformer provides an AC output only. A converter may provide AC or DC at its output: you need one with a DC output. If yours does have a DC output and is a switch mode type then perhaps it dislikes the start-up current surge which a pump draws so shuts itself down. Is your original power supply a linear type or a switch mode type?
     
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