Ct not registerin current

[cliffed]

mornin 2 all,got a problem with a square d power logic 750 meter controller,Brown phase not being registered on the amperage scale,other phases r ok.Now the easier way ou of this get square d bac & check it out,but those in ctrl dont want that easy option.We hav drwaings offa square d,but these do not tally up wiv the way its been wired,basically is it ok 2 have the S2 connection on the cts wired 2 the +,on there drawing they r wired 2 the _ which is the commoned to all other cts,any ideas ta ra bab cheers

 

[Knobhead]

Any chance of that in English?

 

[bugsy]

?????????????

 

[cliffed]

Any chance of that in English?

Ok ,the cts registerin the current to the controller,r connected differently from their supplied drawing,the brown phase is not registerin the curent,does any1 think that the S2 connection on the ct is usually wired to the positive,on their drawing they shud b wired to the negative,is this relevant 2 why the brown phase is not registerin the current,S1 & S2 r the ct connections,hope thats a bit better cheers ta ra bab

 

[malcolmsanford]

Well after using the enigma machine on your post ...............I can only say are all the phases wired up the same as the brown phase? If they are are they working ?

If you answer yes to this then check that you don't have either a duff coil or meter.

 

[Knobhead]

You need to test the output from each CT. But for god’s sake open circuit them while they under load, either you or the CT will be fried. You are best to use an analogue meter.
Why don’t your company want to get the makers back?

 

[cliffed]

Well after using the enigma machine on your post ...............I can only say are all the phases wired up the same as the brown phase? If they are are they working ?

If you answer yes to this then check that you don't have either a duff coil or meter.

thanks tony,all phases r wired up the same,looks like a duff ct,cheers

 

[cliffed]

oops sorry thanks malcolmsanford

 

[cliffed]

You need to test the output from each CT. But for god’s sake open circuit them while they under load, either you or the CT will be fried. You are best to use an analogue meter.
Why don’t your company want to get the makers back?

Its a long story,its a job we took over from a bust firm,the panel been standing around 4 ages,electrics jus recently been energised,& so this problem came up,Square D,wants a fortune 2 jus look at it cheers 4 your help ta ra bab

 

[Knobhead]

Just spotted my mistake!
But for god’s sake don't open circuit them while they under load, either you or the CT will be fried.

 

[cliffed]

Just spotted my mistake!
But for god’s sake don't open circuit them while they under load, either you or the CT will be fried.

Yeah thats ok,switched off before testing cheers