Voltage indicator is saying 690 volts

[Rather be Fishing]

Hi guys I know I've got countless thread running but this is a new one for me


So the report was no power to the door mag.

I found this little box that supplies it and got my tester out

The video below shows the reading and the pic shows how high my tester reads

I have to use the tester works provided now days so it a new one for me but surely there can be 690 volts to it.

Surely the 13a fuse from the non switched fused spur would pop or a breaker would trip.

With electrics I'm finding it's never simple is it.

God knows what I'm gonna do about it.

I think I should probably conform the tester isn't kaput by measuring a known 240 volt supply

Other then that I'm a bit post

 

[James]

What are you measuring the voltage from and to?

 

[snowhead]

You already know it's not and can't be 690v ac, the lack of smoke proves that.

In no particular order;

Does the 690v go away with the Fuse out the Spur?
Does the tester show 690v on another source that you might reasonably expect to be 240v (ish)?

Depending on the results of the above, can you get it into the bin from where you're standing?

Fire alarm not reset after a test is always a good one for door magnets not powered.
Otherwise pigtail on the door if the solenoid is on it.

If your working in a cash handling lobby, don't open both doors, it can get interesting.

 

[Rather be Fishing]

Thanks @snowhead I will confirm 240 volts on a know 240V supply and I will get a reading without the fuse in the fcu just to see what that says. I always though without that in then no power will be able to leave it as that is part of the circuit but im intrigued to see if it does now.

Possibly my new tester is already broken and I will have to get a new one.

I'm so glad Ive got this place

@James thanks for letting me on hhere mate it has been of great benefit to me and the guys you have selected as mentors well all of them have been absolutely superb with me. A massive thanks to all of you who have been answering my questions and countless pm's you've been brilliant.

 

[Rather be Fishing]

What are you measuring the voltage from and to?

Hi @James

I'm measuring it from that white box. I'm not sure what it's actually called buts it's part of the door mag system possible a interface?

Your supposed to push a exit button which will disengage the magnet so you can walk through the door


When your on the outside so the yard side of the door your supposed to use the key pad to punch in a code which will then tempoarily release the mag much like the exit button should so you can come in

Well neither of them are working and the light on the mag to say there is power there isn't a light either.

Its fed from that fcu above but it's in such a stupid location it's a bit tricky trying to get a tester on it to see what them reading are.

I thought the next best would be to check power is coming in to the unit so fed from the load side of that fcu and my tester was just lighting up to 690v which spooked me if in honest

 

[Lister1987]

Do you have any technical information? There should be documents pertaining to tht doormag install pertaining to BS7374 / BS EN 60839-11. As as fitted drawings?

 

[Rather be Fishing]

Nothing at all @Lister1987 but there never is I tend to find

 

[UNG]

Is there a green "emergency door release" break glass on the secure side of the door it's quite usual to find these have been activated on no power to door call outs

Depending on the age of the battery ( normally written on the battery ) you can find that a fuse or fuses have failed especially if the mains has been interupted and the battery voltage falls away increasing the circuit current, the battery would normally be good for 4 - 5 years and can last longer but the capacity starts to quite significantly reduce. It is normal to replace the SLA batteries at 5 years old

If you are fault finding on this type of equipment a multi meter can be useful for checking the "white box" PSU output,

 

[Rather be Fishing]

All I know is this isn't going away.

Someone from trinity and fire and security come out to look at the job as it was put through initially straight to them as it a door issue.

Well I think they've come out not really knowing what they are doing.

Now I've got no power coming into this white box shown in the pics so I've gone to the switch fused spur feeding it and this is what I've found.

Using my eyes it just doesnt looks right

It's like hes come in had a go and just connected things together how he thought and fooled off saying you need an electricians

Well yes I've got my qualifications but I'm still learning.


Can anyone help me suss this

Here are the pics

 

[Rather be Fishing]

All I know is this isn't going away.

Someone from trinity and fire and security come out to look at the job as it was put through initially straight to them as it a door issue.

Well I think they've come out not really knowing what they are doing.

Now I've got no power coming into this white box shown in the pics so I've gone to the switch fused spur feeding it and this is what I've found.

Using my eyes it just doesnt looks right

It's like hes

 

[Rather be Fishing]

It just doesnt look right does it.

What I've come up with is to take that big red one which for some reason is connected with a choc block to a blue which I presume is part of the fire alarm system and that just so happens to be the same size as the neutral which is going in to the neutral in the supply side of the spur and put it into the live terminal on the supply side of the spur and then the little brown which is currently in there put that with the blue from the fire alarm cable but it's just a guess and something I could try.

I've got my tester out for some readings and I'm getting 0 v between the neutral on the supply side of the spur and earth which is good.

Between the current ouve supply cable and neutral I'm getting 15 volts

And im also getting 15 bolts testing between the big red cable and smaller blue one in the connector and the neutral on the supply side of the spur.

I'm not sure if anyone can follow that but hopefully they can

 

[Rather be Fishing]

Can you beleive it I've found another board and low and behold a tripped mcb.

No sure what was going on with a red and blue being together in that chocbloc but guess the fire alarm giys have there own set of rules regs.

Relieved to find that the power is back to the unit and the door is back working as it should.

Praise the lord

 

[UNG]

Does the red FP cable go to the fire alarm panel

 

[Rather be Fishing]

Does the red FP cable go to the fire alarm panel

Hi @UNG
I beleive it does at some point mate but in terms of following that cable to see if get there eventually I couldn't tell you as it disappears through walls and ceiling quite a bit. I will have a look on the other side of the door tomorrow as I think initially it goes into some white box that is do do with the fire alarms.


Thanks for your post ?

 

[Lister1987]

Hi @UNG
I beleive it does at some point mate but in terms of following that cable to see if get there eventually I couldn't tell you as it disappears through walls and ceiling quite a bit. I will have a look on the other side of the door tomorrow as I think initially it goes into some white box that is do do with the fire alarms.


Thanks for your post ?

If you've got the time I'd get it all belled out from the MCB through to the door mag and belling out everything until you know where it goes and what it does, then you can make updated drawings for the next poor sod has an idea what is going on.