300kg door magnets

THe property is flats buit circa 10-12 years ago. All corridor access doors are fitted wirh standard 300 kg dor magnets, which are doing what they are suppossed to do, magnet and keeper plates meet, but with a sharp tug, you can pull the doors open. So question is:-

1/ can you normally overcome door magnets so easily? I'm sure the ones I hve fitted inthe past were not so easily overcome.

2/ would this suggest door magnets are knackered?

3/ would this suggest power supply is undersized? Not sure what the supply is, it was tucked away in a locked cupboard.

Your thoughts please.

does the armature align correctly and have some movement on the bolt holding it?

have you got the voltages right - they are usualy 12 or 24v, but if you give it 12v but set to 24v it will be weak

itll be a slimline mag (usually 250-300kg). standard are 500-550kg

they align correctly, but just don't hold well. I spent a couple of hours shaving one of the doors which has dropped in it's frame to correct magnet / keeper plate alignment, and it still doesn't hold properly. Not sure what voltage they are set for as I couldn't access the power supply., but I think they are 12v? 

There is some movement on the keeper plate, rubber washer is fitted. Can't quite remember as it's a long time since I went in one of the cupboards with the power supplies in, but I think the doors share power supplies - standard 4A units, 2 doors per supply, so possibly power supply isn't man enough?

When you say you can "pull the doors open"   I take it you are talking about security door keeps ? 

I  was thinking in terms of fire alarm  magnets holding fire doors open ..to close on alarm. 

security doors, I've fitted a few in the past, and I'm sure I couldn't just pull them open.

 In that case then ,  In my experience you're right , you can't usually pull them open . 

open the cover and measure the voltage on them. then check to see if the jumpers / switch is set to the voltage you have. 2 jumpers between pins 1&2, 3&4 is 12v. 1 between pin 2&3 is 24v

could even be volt drop if its a long run in a small CSA cable

I'll have a look next time I'm onsite. 

cable run is only about 3 m in signal cable, so that shouldn't be an issue.

Evans Electric said:

 In that case then ,  In my experience you're right , you can't usually pull them open . 

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that's what I thought, somethings wrong then! 

I was in an office one time and a girl did not see the door ( held on a maglok) and opened it with her face

after we stopped laughing I took her to A&E

sympathetic type then?  :^O

binky said:

sympathetic type then?  :^O

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Yes, it was the fluffy kitten like caring side of me coming to the fore.  I barely noticed she had a cracking set of norks, barely noticed, but I reckon you could hang a wet duffle coat on each one

kerching said:

Yes, it was the fluffy kitten like caring side of me coming to the fore.  I barely noticed she had a cracking set of norks, barely noticed, but I reckon you could hang a wet duffle coat on each one

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I remember a similar incident, I was doing a lot of work on riding stables at the time, one Sunday we were driving down a country lane and I recognised a horse box that was broken down on a bend, it had a large brick jammed between the twin wheels on the rear axle. I stopped to help and spent about 20 minutes getting the brick out, it ended up a hammer and chisel job. Anyway, the young lady driving it was stood at the back talking to me as I worked, from my position all I could see was a pair of nicely shaped legs encased in tight jodhpurs and long black boots, I vaguely remember her being rather well built up top too, as for her face, I couldn't see it.

Well the following day I was back at the stables working away and this young lady came up to me, dressed in a loose top and baggy jeans, "there you are love, that's for yesterday" she said, pressing a 20 pound note into my hand. I wondered what I'd done that was worth £20, until she pointed out to a mate of hers that I was the nice man who'd helped her with the tyre. lol

Thought I would update this thread. I eventually replaced the power supply - all doors now working as they should. Looking back at it, this should have been done a few years ago, it seems door-entry power supplies fail very slowly! Indicators of pending doom are, buzzing from the magnets, and poor door holding.