I just noticed that one of my SC2's is powered using aux power with 12VDC.The SC2 is programmed as all switches.When I disconnect the DC source the Sc2 still works.The green light is on either way,with my layout 12vAC on or off(transformer off).any ideas?
Bob
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I believe is also power via the #1 contact point set. SC2 manual pages 6 and 7. There are (3) ways to power an SC2
(1) Wall wart
(2) Aux input
(3) Sw1 input and the common from the Aux input.
Disconnect/or turn off power to the Sw1 terminals, hopefully the power light should go out.
The manual says the wall wart plug or the aux ie. track power connections when it is set as all acc.
Why does dc work?
My wall wart power pack says 12 volt AC. Never tried to use it with a DC supply. I've powered my via AUX output on the main transformer and that worked well, it's also AC.
Without the wall wart plugged in and the transformer on the sc2 still works.the wall wart is wired to the track power connections,so with it disconnected where would the sc2 get power?
What type of switches? Depending on the type of switch you may be pulling power for the SC2 off of the terminals for Switch 1.
Without the wall wart plugged in and the transformer on the sc2 still works.the wall wart is wired to the track power connections,so with it disconnected where would the sc2 get power?
The power comes through the circuits in the switches that illuminate the bulbs in the switches and controllers.
A bunch of diodes all feed the power circuit for the SC-2. The diodes provide isolation for power coming in from SW1 Out and Thru, the Aux 2-terminal port and the coaxial port. DC will also work if the polarity of the DC is proper for power to pass through the series diode.
There are no switches attached.It is setup as all ac
Is the polarity correct if the green light is on?
In you original post you explicitly state the unit is programmed for switches?
With the power connections disconnected I still have a green light.???
I made a mistake..
The sc2 is set as all Acc.
It takes very little power to power up the SC-2. It is powered, through all of the diodes as explained by Dale above, by tapping off of the potential(s) across the open circuits created by the open contacts of the SC-2 relays, whether it's accessories or switches.
What do you mean by tapping off?
There is a voltage potential across every open control circuit on the SC-2. The SC-2, through the diodes as Dale describes above to isolate the individual circuits/accessories, uses those potentials(voltage) to power itself.
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