I am taking over an old Ademco Vista-20P system which has a Honeywell PIR model DT-7345.
My Take-345 module works great on all my other wired sensors, but does not register an event with this PIR. I have connected the NC terminal and C Terminal as one would expect, and the Take-345 only registers an event if I remove the input lead. Does this have anything to do with an EOL resistor, and if so, can you help me with that.
thank you
Can you verify that the motion detector is powered?
If so, you mention connecting it as NC - was the sensor previously wired as a NO contact? If so, you may have a resistor in parallel with the circuit (rather than in series). The resistor can be removed entirely using the TAKE-345.
Actually the model number is DT-7345C, and only has the following terminals- C,EOL,NC. (there is not an “NO” terminal on this model).
I have not changed the wring of the PIR terminal block at the detector.
There was no resistor in the circuit (as you suggest is correct)
I have the C-common to common ground
I have the NC-normally closed terminal to the Take-345 terminal.
The PIR seems to be functioning, with the red indicator light coming on when activated.
Measuring acreoss the C/NC terminals, it is open when not activated and about 22ohms when activated. I only have a cheap OHM meter.
The 2GIG panel shows no triggering at all when the motion is triggered (red LED), but if the Take-345 terminal wire is removed, an event is registered.
Could there be a programming issue at the panl?
Measuring acreoss the C/NC terminals, it is open when not activated and about 22ohms when activated. I only have a cheap OHM meter.
If it is open at rest when not activated then it is acting as a Normally open sensor.
For a normally closed sensor, the circuit should go from 0 (or near 0) ohms when closed and at rest, to open, or infinite ohms when activated.
Can you test that one more time to be sure?
Also according to the manual, there are two models: DT-7345, and DT-7345C. The second one does indicate it has a NO output. See attached diagram. Can you verify which you have and whether or not at the detector there is a NO output.
Jason,
Thanks for all your help!
Nothing made sense so I went back to the basics. They had it wired to the AC source instead of the DC source from the old Vista Panel!!
It has never worked in the 3 years I have been under contract!
This whole thing has been a great exercise that I simply did not have time for 3 years ago.
What a rats nest! Whoever wired this should be shot. I have now totally rewired and rerouted all of the wires at the OLD panel, and it actually makes sense now and looks nice.
Now it works great.
George
p.s. Can you give me a good reason why the 2GIG Control Panel should get its power off of a separate 14V DC supply, instead of using the supply from the filtered 15.5V DC from the Old Panel?
Can you give me a good reason why the 2GIG Control Panel should get its power off of a separate 14V DC supply, instead of using the supply from the filtered 15.5V DC from the Old Panel?
Yep:
Using a non standard power supply would void warranty.
Transformers provide a little more than what they state, the actual operating voltage at the panel is probably somewhere between 12.5 and 14.5, taking voltage drop into calculation. You do not want to provide more Volts or fewer amps than specified.
