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#1
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Pond pump speed control
Is is possible to use a speed controller (like a light dimmer) with a small
pond pump? I have a Bermuda 3000 (3000l/hr) submersible pump that's really a bit more powerful than I need. The motor has a solid rotor that appears to be made of a ferrite like material. I know that speed controllers can cause overheating problems with some motors but given that it's underwater with water bathing the rotor, I don't imagine this would be a problem in this case. Tim -- Remove the obvious to reply by email. |
#2
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Pond pump speed control
"Tim Downie" wrote in message ... Is is possible to use a speed controller (like a light dimmer) with a small pond pump? I have a Bermuda 3000 (3000l/hr) submersible pump that's really a bit more powerful than I need. The motor has a solid rotor that appears to be made of a ferrite like material. I know that speed controllers can cause overheating problems with some motors but given that it's underwater with water bathing the rotor, I don't imagine this would be a problem in this case. Tim Unless you want to boil the water. It is simpler to install a restriction washer to the outlet spout I would think. If the diameter of the spout is, say, 10 mm full bore. Then placing a washer with a hole size of 5 mm should greatly reduce the output from the spout. Is the fancy head removable ? If it is, then put a small rubber washer with a smaller hole on top before you put the head back on. --- http://www.basecuritysystems.no-ip.com Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.688 / Virus Database: 449 - Release Date: 18/05/04 |
#3
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Pond pump speed control
Get a smaller pump it may pay for itself in electricity.
"Tim Downie" wrote in message ... Is is possible to use a speed controller (like a light dimmer) with a small pond pump? I have a Bermuda 3000 (3000l/hr) submersible pump that's really a bit more powerful than I need. The motor has a solid rotor that appears to be made of a ferrite like material. I know that speed controllers can cause overheating problems with some motors but given that it's underwater with water bathing the rotor, I don't imagine this would be a problem in this case. Tim -- Remove the obvious to reply by email. |
#4
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Pond pump speed control
"Mickey" wrote in message
... Get a smaller pump it may pay for itself in electricity. "Tim Downie" wrote in message ... Is is possible to use a speed controller (like a light dimmer) with a small pond pump? I have a Bermuda 3000 (3000l/hr) submersible pump that's really a bit more powerful than I need. The motor has a solid rotor that appears to be made of a ferrite like material. I know that speed controllers can cause overheating problems with some motors but given that it's underwater with water bathing the rotor, I don't imagine this would be a problem in this case. Quick calculation - 3000 l/hr pump takes 30 Watts - 1500l/hr pump takes 20 watts, so you save 10 watts switching to a smaller pump. 10 watts costs about £5 assuming you run the pump 24*7, pumps cost £50, so you only save money by changing the pump after 10 years! Of course these numbers are almost certainly wrong! I thought the best way to control the flow would be to bleed some water off before the fountain/filter or whatever is taking too much water. Andy |
#5
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Pond pump speed control
You can restrict the outflow side of the pump, but not the intake or you
will burn out your pump prematurely - I use a "ball valve" to reduce the waterflow on my submersible pump on the line to my filter Gale :~) "Tim Downie" wrote in message ... Is is possible to use a speed controller (like a light dimmer) with a small pond pump? I have a Bermuda 3000 (3000l/hr) submersible pump that's really a bit more powerful than I need. The motor has a solid rotor that appears to be made of a ferrite like material. I know that speed controllers can cause overheating problems with some motors but given that it's underwater with water bathing the rotor, I don't imagine this would be a problem in this case. Tim -- Remove the obvious to reply by email. |
#6
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Pond pump speed control
Easy solution just screw a splitter onto it and divert the extra water to a
spitter or your water fall....MIKE "Tim Downie" wrote in message ... Is is possible to use a speed controller (like a light dimmer) with a small pond pump? I have a Bermuda 3000 (3000l/hr) submersible pump that's really a bit more powerful than I need. The motor has a solid rotor that appears to be made of a ferrite like material. I know that speed controllers can cause overheating problems with some motors but given that it's underwater with water bathing the rotor, I don't imagine this would be a problem in this case. Tim -- Remove the obvious to reply by email. |
#7
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Pond pump speed control
"Tim Downie" wrote in message ... Is is possible to use a speed controller (like a light dimmer) with a small pond pump? I have a Bermuda 3000 (3000l/hr) submersible pump that's really a bit more powerful than I need. The motor has a solid rotor that appears to be made of a ferrite like material. I know that speed controllers can cause overheating problems with some motors but given that it's underwater with water bathing the rotor, I don't imagine this would be a problem in this case. I'd suggest the following... 1. Get a new smaller pump, and sell this one on eBay. Your electric bill will thank you. 2. Attach a short piece of hose, and a valve downstream from the pump. It's not a problem to restrict the output of the pump. You don't want to restrict the input. BV. |
#8
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Pond pump speed control
In uk.d-i-y Benign Vanilla wrote:
"Tim Downie" wrote in message ... Is is possible to use a speed controller (like a light dimmer) with a small pond pump? I have a Bermuda 3000 (3000l/hr) submersible pump that's really a bit more powerful than I need. The motor has a solid rotor that appears to be made of a ferrite like material. I know that speed controllers can cause overheating problems with some motors but given that it's underwater with water bathing the rotor, I don't imagine this would be a problem in this case. I'd suggest the following... 1. Get a new smaller pump, and sell this one on eBay. Your electric bill will thank you. Pumps may use less than sticker ratings. I have several 600W submersible pumps, that are (IIRC) 3000l/sec, from lidl. I stuck a meter on them, and they come out at around 360W. |
#9
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Pond pump speed control
BigWallop wrote: Unless you want to boil the water. It is simpler to install a restriction washer to the outlet spout I would think. If the diameter of the spout is, say, 10 mm full bore. Then placing a washer with a hole size of 5 mm should greatly reduce the output from the spout. Is the fancy head removable ? If it is, then put a small rubber washer with a smaller hole on top before you put the head back on. --- http://www.basecuritysystems.no-ip.com Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.688 / Virus Database: 449 - Release Date: 18/05/04 Rather than waste the pump's output by restricting it, run a "T" off the output side and divert some of the flow to a home-made venturi (another "T" with a restrictor on the long side and and an air intake tube into the short side - you have to experiment a bit to get it right). This will add valuable oxygenation to your pond and add a little more movement to the water. Balance the flow between the two outputs with ball valves on the hoses. -- Geoff Beale Extract digit to email. |
#10
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Pond pump speed control
In uk.d-i-y Tim Downie wrote:
Is is possible to use a speed controller (like a light dimmer) with a small pond pump? I have a Bermuda 3000 (3000l/hr) submersible pump that's really a bit more powerful than I need. The motor has a solid rotor that appears to be made of a ferrite like material. I know that speed controllers can cause overheating problems with some motors but given that it's underwater with water bathing the rotor, I don't imagine this would be a problem in this case. In this case, simple speed controllers won't actually work, it'll stay at a constant speed (3000RPM) until it stops working, and hums loudly. Suitable speed controllers are going for around 40-50 quid on ebay. Search on inverter phase motor induction on ebay, searching titles and descriptions. |
#11
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Pond pump speed control
Gale Pearce wrote:
You can restrict the outflow side of the pump, but not the intake or you will burn out your pump prematurely - I use a "ball valve" to reduce the waterflow on my submersible pump on the line to my filter Gale :~) I've already got a restrictor and T-piece on the pump outlet so I can control the output at present. Somehow it doesn't feel "right" to reduce the flow this way. I can't help feeling that it's putting extra load on the pump. As I have a reasonably hefty lamp dimmer kicking around, I was just wondering if using a device like this would be more mechanically "sympathetic" IYKWIM. (Probably complete nonsense I know). Tim -- Remove the obvious to reply by email. |
#12
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Pond pump speed control
On Fri, 21 May 2004 11:20:01 +0100, "Tim Downie"
wrote: Is is possible to use a speed controller (like a light dimmer) with a small pond pump? I have a Bermuda 3000 (3000l/hr) submersible pump that's really a bit more powerful than I need. The motor has a solid rotor that appears to be made of a ferrite like material. I know that speed controllers can cause overheating problems with some motors but given that it's underwater with water bathing the rotor, I don't imagine this would be a problem in this case. Pace "Home Improvement", there is no such concept to a man as "too much power". What you need is more pond... -- Too much month at the end of the money. Mail john rather than nospam... |
#13
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Pond pump speed control
"John Laird" wrote in message ... On Fri, 21 May 2004 11:20:01 +0100, "Tim Downie" wrote: Is is possible to use a speed controller (like a light dimmer) with a small pond pump? I have a Bermuda 3000 (3000l/hr) submersible pump that's really a bit more powerful than I need. The motor has a solid rotor that appears to be made of a ferrite like material. I know that speed controllers can cause overheating problems with some motors but given that it's underwater with water bathing the rotor, I don't imagine this would be a problem in this case. Pace "Home Improvement", there is no such concept to a man as "too much power". What you need is more pond... -- Too much month at the end of the money. Well put. |
#14
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Pond pump speed control
"Tim Downie" wrote in message ... Gale Pearce wrote: You can restrict the outflow side of the pump, but not the intake or you will burn out your pump prematurely - I use a "ball valve" to reduce the waterflow on my submersible pump on the line to my filter Gale :~) I've already got a restrictor and T-piece on the pump outlet so I can control the output at present. Somehow it doesn't feel "right" to reduce the flow this way. I can't help feeling that it's putting extra load on the pump. As I have a reasonably hefty lamp dimmer kicking around, I was just wondering if using a device like this would be more mechanically "sympathetic" IYKWIM. (Probably complete nonsense I know). Since these are just turbine pumps, there is no difference as far as the pump is concerned as to the location of the restriction on either the input or output. I would not use a lamp dimmer since these are typically just triacs and have a spiky output waveform which will cause motor heating, however a variable speed control for a ceiling fan should work fine. One other aspect to be aware of is that many pumps use either a fan or in the case of submersibles, water to cool the motor. In this case any restriction of flow, either by speed control, or by restriction may result in some heating and should be watched. Jeff Lowe |
#15
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Pond pump speed control
On Fri, 21 May 2004 17:05:22 +0100, in uk.d-i-y "Tim Downie"
strung together this: I've already got a restrictor and T-piece on the pump outlet so I can control the output at present. Somehow it doesn't feel "right" to reduce the flow this way. If you read the instructions on most pumps that's how it's supposed to be done. And under high pressure it probably would put additional strain on the pump, but not really a concern at low pressures. -- SJW A.C.S. Ltd. |
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