Weird panel dump

kinda vague on the symptoms. "The unit activated for no apparent reason" aint a whole hell of a lot to go on.

Did the supression panel activate/go through the normal releasing sequence or did the solenoid activate by itself?

Jewellfish

Was the panel still in alarm when you showed up? Or did someone "reset" it for you... We need more info.

That panel is setup for cross-zone detection before the release, right?

Panel releases on single event and was in full alarm when i got there. checked for shorts, grounds you name it and could find no reason why it activated used mego-meter for insulation testing and it showed all components with in spec.. It uses those tube type bi metal heat sensors was 50 degree day. The panel is of 80's vintage and unless something broke down in control it has me stumped.

Check the loop resistance and the stability of the panel voltage..

I have had some 80's Firelite panels with a "Floating" panel voltage (would change 4-6 volts from day to day..) which changed the percentage of current to trip on the load of each zone loop.

If the loop resistance was close to the edge of the acceptable limit, changing the loop current might cause the zone to trip..

RTS

Panel releases on single event and was in full alarm when i got there. checked for shorts, grounds you name it and could find no reason why it activated used mego-meter for insulation testing and it showed all components with in spec.. It uses those tube type bi metal heat sensors was 50 degree day. The panel is of 80's vintage and unless something broke down in control it has me stumped.

Thankyou for the tip will check it out. never gave that one a thought