Screw fix heavy duty contact 3 wire

I have purchased on of these for my garage door it has 3 wires blue yellow and black has anyone got some information on how to wire it up currently I have blue and yellow connected as a zone but it shows an open circuit so I am now assuming the black wire does come into play but where does it go?

Thanks Dave.

continuity test between the pairs in turn against magnet untill you get short, then remove magnet and see if short clears

It should have come with instructions on how to wire the unit. If not you will need to use a multimeter or some other method of continuity testing to identify the normaly closed pair (ie you get a closed circuit with the magnet in place and an open circuit with the magnet removed). Try metering between black and blue and black and yellow.

Could it be common, Normally Open and Normally Closed?

Could it be common, Normally Open and Normally Closed?

agree 3 wires..its got to be c/no/nc..tho what use a no contact has on an inruder alarm beats me,sounds like one of those contacts connected to a heating system you see in factorys on the roller door..

Sounds like theres a red wire missing? or its EOL? I think the latter unlikely DIY panels are not usually overcomplicated.

Pete

AHa found the bloody red wire about 20mm down the sheath thanks i now I assume the red is the power supply and the black is the earth thanks for your help.

Regards Dave.

no no no

red and yellow will be your alarm pair and black and blue is tamper

dont put any power on it it you might kill it!!!

AHa found the bloody red wire about 20mm down the sheath thanks i now I assume the red is the power supply and the black is the earth thanks for your help.

Regards Dave.

12v contacts...en regs have gone too far..

AHa

alan partridge alarms ltd...

no no no

red and yellow will be your alarm pair and black and blue is tamper

dont put any power on it it you might kill it!!!

Thanks

i blame b&q...