Supply voltage to pump for tap on 1994 Pan.

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Supply voltage to pump for tap on 1994 Pan.

in Improving your pride and joy and how to fix things Fri Sep 04, 2015 7:52 pm
by Barracuda (deleted)

I am about to replace the water pump on my 94 Pan, but on checking the polarity at the connections, my meter showed 16 volts (no load). It only uses mains via an old control box. Is this a problem?

RE: Supply voltage to pump for tap on 1994 Pan.

in Improving your pride and joy and how to fix things Fri Sep 04, 2015 8:09 pm
by hob (deleted)

As far as I am aware water pumps work at 12 volt, may be worth having a chat with a caravan maintenance engineer there is a section on maintenance men here

Caravan servicing and repairs, including mobile technicians.

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RE: Supply voltage to pump for tap on 1994 Pan.

in Improving your pride and joy and how to fix things Sat Sep 05, 2015 9:37 am
by Pepé Le Pew •

| 2.752 Posts

Quote: Barracuda wrote in post #1
I am about to replace the water pump on my 94 Pan, but on checking the polarity at the connections, my meter showed 16 volts (no load). It only uses mains via an old control box. Is this a problem?

If the pump ran off a battery it would have to cope with a voltage which could be as high as 13.8v if the battery was being charged on board at the time.

16v might be a bit high though - it might cause the pump to pulsate and it'd probably shorten the motor's life.

If you wanted a steady 12v and you were intending to use 230v as the input - i.e. on hook up - you could plug in (or wire in) a PC power supply unit. That would provide you with a very smooth 12v dc output and plenty of amps.

A side benefit would be that you also get at least one 5v output which is the same voltage that USB chargers use.

PSUs aren't very expensive at all, and you wouldn't need one which produces gigawatts anyway.

.

rT-7

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RE: Supply voltage to pump for tap on 1994 Pan.

in Improving your pride and joy and how to fix things Wed Sep 09, 2015 7:58 pm
by GeorgeWM (deleted)

Hello Barracuda,

My limited experience (one Familia) is that around 16V open circuit is about right. The pump is normally driven by two separate secondary windings on the BIP transformer each feeding through a diode to give full wave rectification just for the DC devices such as the pump(s) and any fans (if you have them). The heavier winding also provides AC for the lights. There is no smoothing or regulation so on open circuit your meter is probably showing the peak voltage. When you connect the new pump and turn it on I think you will be able to measure something nearer to 12V, especially if you have any lights turned on at the same time.

Regards,

George