ANALYSIS
- For this project, relay DPDT will be used
as a backup if there is any power failure.
- Power failure means there is no power
supply. There is an alternative way that I can use by using battery of 12 volt.
Therefore, this project will be added one more relay of DPDT as a function to
replace power supply.
Terminal Pins
A
Double Pole Double Throw Relay comes with 8 terminal points.
The
terminals are COIL, COIL, COM, COM, NO, NO, NC, NC.
Terminal Descriptions
COIL-
This the is the COIL terminal. These are the terminals where you apply voltage
to in order to give power to the coils (which then will close the switch).
Polarity does not matter. One side gets positive voltage and the other side
gets negative voltage. It doesn't matter which order. Polarity only matters if
a diode is used.
NO-
This is Normally Open switch. This is the terminal where you connect the device
that you want the relay to power, when the relay is powered, meaning when the
COIL receives sufficient voltage. The device connected to NO will be off when
the relay has no power and will turn on when the relay receives power.
NC-
This is the Normally Closed Switch. This is the terminal where you connect the
device that you want powered when the relay receives no power. The device
connected to NC will be on when the relay has no power and will turn off when
the relay receives power.
COM-
This is the common of the relay. If the relay is powered and the switch is
closed, COM and NO have continuity. If the relay isn't powered and the switch
is open, COM and NC have continuity. This is the terminal of the relay where
you connect the first part of your circuit to.
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