mltj74

i was woundering if anyone knew a circuit that would light up a led when a load quit working like say a pump quit working

rjvh

what kind of pump/motor ?

normaly you have thermal overload protection with auxilary contacts that you use for a indicator light or alarm

or you need a status indicator (on/off) light
than you switch it with the contactor contact

Robert-Jan

mltj74

its a 12 volt fuel pump and i would lie to use it on some 3 way valves also if anyone of these failed it could cause some major damage i would just like a indicator light in my cab to let me know one of them failed

rjvh

its just the motor that you want have an indication or is it if one of the valves failed that you want to have an indication??? or both??
Robert-Jan

mltj74

both so i would like a circuit flexable enough to use with both making 3 or so different circuits for each load wouldnt be a problem

rjvh

do you use solenoid valves???

Robert-Jan

Leftyretro

Or do you really want a final control element alarm when there is lack or low fuel pressure? A pressure sensor would give the best overall alarm that something is wrong, without having to have several sensors to detect problems on individual stages and parts and peices of the system.

Lefty

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Measurement changes behavior

mltj74

pressure gauge is no good the light or alarm would be going off all the time theres no pressure differnce between big mess and normal operation and yes they are solenoid valves