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Member postings for Nathan Sharpe

Here is a list of all the postings Nathan Sharpe has made in our forums. Click on a thread name to jump to the thread.

Thread: Continuous use of a phase convertor.
26/03/2017 22:03:10

Thank you all for your input. The inverters we are using ( Invertek Optidrive e3) are correctly configured and we are using our control circuit on the correct IP/OP terminals. They are British made and have a specific parameter set for pumps. My question was answered by both Martin P and Scrumpy after that I lost interest. I did ask that you did not tell me about inverters, I know about inverters, we install 35/40 inverter driven systems each year but they have not been reliable or effective on this job and I need to find another way to power these sewage pumps before the ground floor flats start to flood AGAIN! Nathan.

25/03/2017 19:48:46

Thank you Martin P and Scrumpy. That is the exact application I have in mind . We need to power a 3ph pump control panel running 2 sub pumps from a single phase supply . We currently have two single phase in three phase out (230v) inverters trying to do the job and they do work after a fashion but are unreliable so far. It looks like they do not like too many switching operations instigated by the float switches and they also add a level of complexity that I do not like on what should be a simple system ! Nathan.

24/03/2017 23:29:22

Thanks vintagengineer, but what I'm looking for is a knowledge from a source which is non manufacturer but IS from someone who has knowledge of this through work or self use. I have had enough of the "advice" from sales orientated tech departments. I need advice from real working humans. Nathan.

24/03/2017 23:00:57

Can a phase converter, not a VFD/Inverter, be run continuously ? It would be powered and in ready mode most of the time and in use (on demand by the load) two to four times a day. Please do not tell me about VFD's/ Inverter's . They are not suited to the possible application and we have already tried them. We do not have 3ph supply available, do have dual voltage motors and have reconfigured to 220/230 v 3ph . My workshop is run from a Transwave converter and has been for 20 years without any hassle but it is a home/hobby workshop and not an everyday continuous use application. I need to know if I can run a 24 hour/7 day/52 week system on a converter. Can any of you help? Nathan.

Thread: Armoured cable - what size would you reccomend
21/03/2017 19:18:55

I was taught that SWA armour was to be used as an equipotential bonding conductor and should be connected to the circuit protective earth. The Reg's still state this. On periodic inspection testing the continuity of Bonding, Circuit Protective Earth and Phase Conductors is carried out on individual cores/wire armour to make sure that all potential current paths are proved to be ,A) continuous, and B) meet minimum insulation resistance requirements. This will show up any existing and any potential faults with the cable if the IR is less 1.5megohm. The Reg's state that while a circuit showing IR of 1.5 megohm is acceptable further investigation should be undertaken to find any latent faults within the circuit. Nathan.

Thread: Anybody know what these are ?
03/03/2017 20:34:09

What stoopid puts left hand threads on wheel nuts?

Would that be similar to those as buys LDV?

Nathan.

Thread: What Did You Do Today (2017)
28/01/2017 22:33:36

Murray, can I suggest that you look at Effast pvc? A short radius 110mm/4" elbow with two short stubs of pipe, multiquick on the pan and possibly another to the soil pipe socket ( if the effast pvc will not fit) should do the job. There are other( cheaper) pvc fittings available, these are simply the range we use at work and are at least 10 bar rated ( if you fully seal the pan when using / had a mega curry last night that could be useful!), and are easily available but are costly. Wall thickness is can be machined to suit your soil pipe by yourself. Nathan

Thread: TEC Strange wires
17/01/2017 22:00:58

In my line of work they are commonly known as Klixon connections, a thermally operated switch, which if you have the terminations for ( on your control panel) you should connect. It can save from a few hundred to many thousands of pounds sterling in downtime/rewinds on pumps (my line of work) or conversely cost YOU that much! I'm not sure who, of the pump manufacturers, made them popular but it was probably Flygt. Nathan.

Thread: What is this for please?
01/01/2017 16:52:03

Looks like a pump of some kind, possibly double acting unless the piston has a non return valve built in to allow single acting. Nathan.

Thread: Myford headstock bearing replacement
24/11/2016 19:38:48

I'm glad I bought a Harrison! 25 yrs in my ownership and none of this sort of faffing about. Nathan.

Thread: Opening .rfa files
13/11/2016 23:18:53

Thanks Robbo but that is RFA which is a gaming file. I need .rfa to open a BIM file from heatrae sadia to read the spec and installation instructions for their Megaflow water heaters. Nathan.

Thread: NZ Quake
13/11/2016 22:22:22

What's the time difference between UK and NZ ? Ian SC was on at 08.32 forum time. Nathan

Thread: Opening .rfa files
13/11/2016 22:08:00

I need to open a few files with the extension .rfa which is I think an Autodesk extension. I've been to the Autodesk site to try and download a trial but no trial is available for my operating system. I'm running Win 10 32bit. Any advice (apart from changing the OS!) would be welcome. Nathan.

Thread: What Did You Do Today (2016)
12/11/2016 20:44:30

Which version Neil? For the Kingsmen I can get away with Am/D/Em/C (on Guitar) for a suitably amateur sound ! Nathan.

Thread: Timing Belts
06/10/2016 19:51:40

Hi Bruce, try looking at power tool parts lists (Dewalt/Elu/Makita etc) lot's of them use urethane toothed belts for power transmission on planers/sanders/thicknessers. My cheapo belt sander, my Dewalt thicknesser and several other tools use easily available belts. Nathan.

Thread: Sweating Plastic
24/09/2016 18:34:31

Well I finally got round to contacting Tesco who , as expected , were more interested in proof of purchase than anything else . When I mentioned that I was worried that the "leachate" could be toxic/carcinogenic they started to listen. Their "service engineers" answer was that it was the fire retardant in the plastic casing sweating out and that I should just wipe it off and forget it . I have told them to escalate the incident to an "over 12 months assessment" and to get me the safety data on the "fire retardant" . I'm not going to let it drop and will go via Trading Standards if required to find out what is going on . No hard plastic should degrade to this extent in 5 years in a domestic situation. Nathan.

11/09/2016 11:52:32

No sweaty plastic explosive or kids!

11/09/2016 11:50:15

Michael W, It contains nothing and is "just" the rear cover for the TV.

Geoff, Nothing exuding from any of the circuit boards in fact there is no sign of any staining or liquid anywhere apart from this cover .

It's not food or drink of any type, could the plastic be breaking down? Nathan.

11/09/2016 11:15:31

Do any of you have experience of plastics exuding liquid? I moved the TV yesterday to do some work on the wall behind it and found my hands were wet with a brown sticky liquid a bit like spilt Coke. Thinking is was Coke I removed the rear casing from the TV and washed it with water/bathroom cleaner, rinsed it and left it to dry overnight. This morning I found the "Coke" stains had returned and it was sweating from what appear to be blisters in the material, both inside and outside surfaces are affected. I suspect that Tesco will not want to know now that the set is 5/6 years old. Could it be dangerous/toxic ?

Nathan.

Thread: Adobe/Photoshop/CS2
05/09/2016 20:29:32

Thanks for your interest John . I am finding it more than capable of doing what I ask from it . The job for swmbo was just a batch of notelets personalised for each recipient ( family who made our trip great ) after the second visit to a family she only discovered last year after many years searching through paper relics and eventually a "final attempt" trip. So, only a job of minor importance ! The last contact ( in what was East Germany) was is 1958 and the search was based on a photograph showing a young family member born in 1940 .

Thanks to all for your help/suggestions.

Nathan.

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