Simon Melton
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Yes @WorkshopChris 2.5 mm 1 m from the consumer unit and its the 4 kw 5.5 hp model
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normspanners
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hum that is a bit close on 13A plug! especially on a loaded motor, the inrush could be a lot higher.
maybe not toooo bad, if on a clutched tool ?
maybe not toooo bad, if on a clutched tool ?
Simon Melton
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Please forgive my total ignorance, im an Engineer Surveyor for Zurich Engineering on the Lift/Crane side the only electrical element of my inspections is for obvious damage/
burning/connections in say a lift panel or tripping limit switches, so does the lack of an adjuster on the item @normspanners kindly provided a link to not matter as it covers
the full range ?
Simon Melton
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No not a loaded motor, not even installed its to try and ensure we have the Transwave working correctly before installation
daleyd
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The one linked to is not suitable as it's an undervoltage relay.
Also it would help to know what the current relay is switching, as Bryce appear to be the only ones to do 8amp rated contacts. They have another model in their range which would do - this one...
http://uk.rs-online.com/web/p/monitoring-relays/2989400/
But it's also unfortunately out of stock in rs!! The others that have suitable sensing ranges have lower rated contacts - if your not switching 8amps then you could use one of these, otherwise you either wait for the Bryce ones to come back in stock or use one of the smaller rated ones to switch an intermediate heavier duty relay to switch your final load.
WorkshopChris
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Ok Although you are only running a 1hp motor, this bigger unit will have a larger transformer so your 13A Fuse may be issue.
Is the 1m from the consumer unit a main board fed from the suppliers meter or a sub board fed via a cable.
As this may need to be taken in consideration depending on size.
As a rule the bigger the cable the better for a converter once running they draw little power it the in rush and volt drop when starting.
Simon Melton
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Thanks @daleyd I did come across that in my search this afternoon, how would I work out the current the relay is switching, I plan to run several 3 phase machines from this supply but never at the same time with safe use very much at the fore front. I will call Broyce and Transwave in the morning and see what I can work out, thanks very much for all your kind and knowledgeable replies so far.
Simon Melton
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Yes I believe it only works with the one contactor @daleyd
daleyd
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Just follow the cables from the voltage sensing relay contacts to wherever they go. If they only go to that contactor then I reckon your into a winner as it'll only pull a small amount of current, so you could get away with a smaller monitoring relay. If it powers other stuff then it gets trickier!
Ah just seen your post above as I'm typing! - if it's only the one contactor then you should see some info on the side of it telling you about power consumption. With this you can determine the size of relay you need to switch it.
Ah just seen your post above as I'm typing! - if it's only the one contactor then you should see some info on the side of it telling you about power consumption. With this you can determine the size of relay you need to switch it.
Simon Melton
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Thanks @WorkshopChris it is fed from a sub board but the 1 m cable from the house is 4mm, the 1hp motor is for test my CVA lathe will be on a 4hp motor, my electrician is going to load
test once we have it running and run in the appropriate cables and breakers. The unit runs with no load attached, but one phase down, the contactor that brings on the boost light on start up
does not pull in as per the original manual I have and the inside of the relay in question has burnt out parts, either the transformer, relay and possibly a resister and diode, my small amount of
electrical knowledge comes from my Intermediate Radio Amateur Licence, im way out of my depth here !!!
Simon Melton
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Right off out to the workshop to check !!
Simon Melton
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Does this help ?
daleyd
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I should be able to find the info on that, but it's only a contactor so it won't be taking anywhere near the full 8 amps, I reckon we should be able to source something suitable. Worth trying Bryce in the morning though as they may have some direct replacements in stock, save a bit of work rewiring on your part but if not at least you will have some alternatives.
Will take a look when I'm on my pc tomorrow (bit easier on the eyes lol!!)
Dale
Will take a look when I'm on my pc tomorrow (bit easier on the eyes lol!!)
Dale
Simon Melton
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Thank you Dale you have been exceptionally patient and helpful to a newbie who doesnt know what he is dealing with, very kind what a great forum and its not even a Mig issue haha, I dont even own a Mig, im a Tig man !!!
Kindest regards Simon
Kindest regards Simon
daleyd
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No probs, it's the kind of stuff I do for a living so it's kind of like falling off a chair 
, but I appreciate if your not used to the terminology or where to look it can be a bit daunting!
I can't offer much in the way of welding advice
so I might as well help where I can!
, but I appreciate if your not used to the terminology or where to look it can be a bit daunting!I can't offer much in the way of welding advice
so I might as well help where I can!normspanners
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sorry I misread the blurb from broyce and presumed it was an under Voltage unit, they list both in the pdf under the same part number I realise NOW the OV stands for OVER voltage 
me being donkey and rushing, thinking you would only be worried about under voltage on a converter.
trouble is you cant rush a donkey they are made slow to go slow -------but to keep going -----
and not think a lot whilst plodding on.
We just keep trying to reach that dangled carrot
me being donkey and rushing, thinking you would only be worried about under voltage on a converter.
trouble is you cant rush a donkey they are made slow to go slow -------but to keep going -----
and not think a lot whilst plodding on.
We just keep trying to reach that dangled carrotQuote
(Hi. I am not selling mine. Needs the transformer buying but money tight.)
You don't really need a transformer as most modern 3 ph motors are wound for star or delta use.
You can still use the parts you have but you need approx' 40 mfd per hp for UK electric supplies.
Auto transformers are quite expensive and second hand one seem to be non existent.
MBB
(Hi. I am not selling mine. Needs the transformer buying but money tight.)
You don't really need a transformer as most modern 3 ph motors are wound for star or delta use.
You can still use the parts you have but you need approx' 40 mfd per hp for UK electric supplies.
Auto transformers are quite expensive and second hand one seem to be non existent.
MBB
daleyd
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Hi, this relay looks like it will do exactly what you need @Simon Melton.
It may well be a bit overkill for your application, but it's the only one I can find that matches the broyce unit specs and is in stock in RS. (240 v single phase supply and separate monitoring up to 300v - this one actually goes to 600v but you can select the range to suit). It looks to be very adjustable so you should be able to set it up exactly the same. The data sheet is very good and explains in some depth the operation modes etc. The output relays are rated to 5A rather than 8 but as you are only using it to drive the one contactor it should be OK.
http://uk.rs-online.com/web/p/monitoring-relays/8193295/
You may be able to source them elsewhere for cheaper than RS prices but these things are quite specialist so might be hard to source. (There are loads of single phase voltage sensing relays about but not many that will sense up to 300V, normally they just sense a % above their supply volts)
It may well be a bit overkill for your application, but it's the only one I can find that matches the broyce unit specs and is in stock in RS. (240 v single phase supply and separate monitoring up to 300v - this one actually goes to 600v but you can select the range to suit). It looks to be very adjustable so you should be able to set it up exactly the same. The data sheet is very good and explains in some depth the operation modes etc. The output relays are rated to 5A rather than 8 but as you are only using it to drive the one contactor it should be OK.
http://uk.rs-online.com/web/p/monitoring-relays/8193295/
You may be able to source them elsewhere for cheaper than RS prices but these things are quite specialist so might be hard to source. (There are loads of single phase voltage sensing relays about but not many that will sense up to 300V, normally they just sense a % above their supply volts)
Stueeee
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