Hi all

I am not a security engineer just a home owner. I have a tool shed with a vanderbilt Act5e keypad controlling a maglock on the door. This is powered by an elmdene psu. It also has a green break glass and push to exit button.

The power had stopped going to maglock and upon various checks with a multimeter the psu, break glass and push to exit switch was OK. I then removed keypad and water had made its way into back of unit and corroded the 12v and 0 terminals and the common wire had snapped. I have replaced the common wire into the 12v terminal and after connecting all back up, the red fault light is showing on the psu, however the maglock is now powered and working. I am thinking it might be recognising a short circuit due to the corrosion. Will cleaning the terminals correct this or will a new keypad be required or any other issues you think it may be. The psu also has a standby battery showing correct voltage. I am not an engineer, I really cannot afford an expensive fix as it's only a shed. I would like to try all things possible to me before removing.

Thanks for any help or advice.

15 minutes ago, LJB said:

Hi all

I am not a security engineer just a home owner. I have a tool shed with a vanderbilt Act5e keypad controlling a maglock on the door. This is powered by an elmdene psu. It also has a green break glass and push to exit button.

The power had stopped going to maglock and upon various checks with a multimeter the psu, break glass and push to exit switch was OK. I then removed keypad and water had made its way into back of unit and corroded the 12v and 0 terminals and the common wire had snapped. I have replaced the common wire into the 12v terminal and after connecting all back up, the red fault light is showing on the psu, however the maglock is now powered and working. I am thinking it might be recognising a short circuit due to the corrosion. Will cleaning the terminals correct this or will a new keypad be required or any other issues you think it may be. The psu also has a standby battery showing correct voltage. I am not an engineer, I really cannot afford an expensive fix as it's only a shed. I would like to try all things possible to me before removing.

Thanks for any help or advice.

Probably need a new keypad , you could try and clean it up a little bit I don't think it will help, although surprised it's had that much water behind it, I have installed and they still working for years 

 

Is it on a slanted feather edge mounted or something?

Fuse has blown on the PSU?

The back of the keypad is potted from what I remember so you maybe lucky and cleaning it up will work with a new fuse?

Keypad is mounted on brick face, whoever originally installed it has placed it over the mortor joints so water has been getting in through this joint. There is only 1 x 1amp glass fuse in the psu which is fine, I have removed the fuse also and done a test of it. As said, the keypad and maglock is now getting power and working as it should. It's just the red error light is now showing on the psu and is worrying me incase it's a fire hazzard. I have powered everything off for now. I have added a photo of back of keypad 

The potting looks like there is a crack round that varistor looking component, maybe water has got in...

I'd still be investigating the Red "fault" light on the supply.

 

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It's just the red error light is now showing on the psu and is worrying me incase it's a fire hazzard. I have powered everything off for now. I have added a photo of back of keypad

Red light= normally a fuse blown, or no battery connected. Disconnect everything at the PSU if it still shows red then you know its not any of the wiring causing the PSU issue. Check the backup battery. Im guessing from the state of thos connections its not been under a service agreement so the battery is probably over 5 years old and may be pulling the psu down 

Thank you, that's a very good bit of advice. Very logical and obvious when pointed out. Appreciate it 

19 minutes ago, LJB said:

Thank you, that's a very good bit of advice. Very logical and obvious when pointed out. Appreciate it 

Trim everything back and reconnect see what happens