Monday, July 27, 2009

Electricians - I wired it correctly but why does the Timer System always give power to output?

Here is a wiring diagram to a Timer System that controls power to an output area: http://tork.com/pdf48w.htm





I believe i have wired it correctly. But please note that i have a black jump wire attaching "H" with "C". I believe this is ok (see diagram) since the internal switch of the system controls when power is given to the "C"/"NO" combination.





The problem is that when i turn on the Timer System so as to set the times the unit should provide output power i find that the output power is already coming out at the end (i check a wall socket where the output is related to) even though the timer's settings indicate that it is "off". What does this mean? Is the timer system defective? How can it be doing this? My guess is the internal switch is leaking power from the timer supply (input source) and triggering the switch to make the "C"/"NO" combination happen regardless and thus giving my output power by just giving power to the Timer System unit.





Or is the jump wire the problem?

Electricians - I wired it correctly but why does the Timer System always give power to output?
"H" (hot) and "N" (neutral) are the power feeds to run the timer motor continuously like a clock. "C" (common) is the hot wire to run through the switches to the area you want to power up at the timer setting. "NO" (normally open) and "NC" (normally closed) are the switch contacts. Normally open means that the switch is open normally. When the timer comes to the setpoint that you set (the time you want the switch to move), the motor moves a switch and the power from "C" is sent out the "NO" contacts. When the timer comes back around to the other setpoint, it moves the switch back to "NC", which is closed normally. If you check it with a ohm meter, you should have a closed switch from "C" to "NC" with no power to the timer motor. You should have no continuity from "C" to "NO". The jumper should not make any difference as long as it is from "H" to "C". Make sure the neutral for the area you want to power up is connected right. If you have power on "NO" all the time, it sounds like to me the timer is defective. I hope this helps! Good luck!!
Reply:I checked this days ago. Anyway there should be no problem with L to C jumper. An electronic relay will leak and an electro mechanical relay does not leak . The drawing doesn't show which type it is. So have you tried an actual load like an incandescent bulb.


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