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24th Oct 2018, 08:26 PM #16Member: Blue and white apron brigade
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- Perth
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24th Oct 2018, 08:48 PM #17Diamond Member
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- Aug 2006
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- Melbourne
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Thanks BaronJ, will work something out.
BobL, no it was just sitting in the tank. I will try again tomorrow to see if it reaches the required height.
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25th Oct 2018, 06:08 PM #18Diamond Member
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- Aug 2006
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- Melbourne
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BobL: Just tested it with the hose attached, I was thinking that I might have to prime it but within 5 seconds I had a continuous flow of water coming out at 1350mm height.
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26th Oct 2018, 12:44 PM #19Golden Member
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- Apr 2018
- Location
- Drouin Vic
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- 634
I've been running the 1/4hp 3-phase coolant pump on my lathe for about 5 years on 240v with capacitor start, very simple system that a friend set up for me when I first got the machine. I have the standard on/off switch plus another rotary switch that I converted to a 'normally open' momentary switch. I hold the momentary switch for a couple of seconds whilst starting, this brings the capacitors in to kick-start the pump. Rough as guts and works a treat. The pump also supplies my milling machine via about 3 meters of garden hose with around 1m of lift. I did essentially the same thing with my recent disc sander build, but using a timer and contactor to bring the capacitors in for the start cycle. From what I have read, 70uf per horsepower is about the right value as a starting point.
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26th Oct 2018, 03:26 PM #20Diamond Member
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- Aug 2006
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- Melbourne
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Is the momentary switch required, can't the cap remain connected full time?
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26th Oct 2018, 05:10 PM #21
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26th Oct 2018, 08:47 PM #22
Hi Guys,
It really shouldn't matter whether the capacitor is left in circuit or not. The thing to do is start the motor and disconnect the cap, see if it slows down or stops. If it caries on running normally, you could use a normally open push button to connect the capacitor for as long as the button is held down, when first switching the motor on.
I've a 1Hp three phase motor that requires 48 uf to start it running, but it slows down and will stop under load if the cap is disconnected. It really could do with a bigger cap, but I don't have another large value one.Best Regards:
Baron J.
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