help no response at keypad

[terrymalc]

just changed a pir,the bellbox went off as i was replacing it,that stopped after 15mins,now i have no response on the keypad,the only light on is Tamper,also the keypad is still illuminated as usual,have i blown a fuse or something?

Terry
p.s not sure if the strobe was on when the bell went off,also i was in the engineers mode and remove the plus wire from the panel(zone 3)which i was changing the pir for

 

[saxondale]

did I not tell you " don`t blow a fuse" ?

 

[joe-90]

...and he must have disconnected the wrong wire.

 

[saxondale]

...and he must have disconnected the wrong wire.

no he disconnected the "plus" wire instead of BOTH power feeds

 

[terrymalc]

Hi Saxondale,could you explain for me BOTH power feeds,as i explained i only disconnected the plus on the panel for zone 3.

many thanks Terry

 

[saxondale]

Hi Saxondale,could you explain for me BOTH power feeds,as i explained i only disconnected the plus on the panel for zone 3.

many thanks Terry

no problem Terry

alarms have two "loops" one for the circuit - positive, and one for anti tamper - negative

it is possible to blow fuses by catching the negative feed and the positive circuit wires or vice versa (doesn`t happen often but sometimes even I do it when testing stuff LOL)

problems usually come when you have to decide do I dis. both feeds (and maybe loose the keypad), power it all down ( and maybe it`ll crash on powering up) or do I do it live and take extra care (and maybe I`ll blow a fuse and all the above will become a problem)

just glad it`s the little stuff and not 240ac

 

[terrymalc]

Thanks Saxondale,much appreciated,got it all back to normal now,blew the strobe fuse,had to pick some up from Maplins,switched off mains ,disconnected internal battery for 5or 6 seconds,all ok,keyboard back to life.

Thanks again Terry