User manual

SimpleComTools, LLC PRC1000 – User Manual
SimpleComTools, LLC 15
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Wiring and setup examples
Wiring your equipment to the PRC1000 is easy. Connect the lead from the power source to the COMMON
terminal on either of the two relays. Then connect the power lead to your equipment to either the Normally
Open or Normally Closed terminal side of that same relay. Which to choose depends on your application.
Here’s how that works….
The PRC1000 has two isolated SPDT (Single Pole Double Throw) relays. That means that
when one side of the relay is engaged (closed), the other side will be disengaged (open). The
PRC1000 operating system refers to the state where the Normally Open side is engaged as
being in the „ON‟ state. (ON is referring to your equipment being powered ON.)
Choosing sides….
When choosing between the Normally Open (NO) and Normally Closed (NC) side of the relay, you have to
consider whether the equipment you are controlling will be regularly OFF and you want to power it ON for a
brief period of time, or regularly ON and needs to be powered OFF for a specific period of time. If you want to
have equipment that is regularly OFF and you power it ON at a specific time for a specific duration, you would
connect the source power lead to the relay COMMON and power lead wire to the device to the Normally
Open side of the relay. Being normally OPEN, the power circuit to the device would be broken and thus the
device would be OFF. When the clock reaches the time set in the ON Time register, the relay will engage
(close), the circuit will complete, and the power to the device will be supplied. The device will then turn on and
stay on for the length of time set in the ON Duration register. When that period expires, the relay will
disengage, the circuit will open, and the power to the device will be cut off. The device will then power OFF,
and stay off until the clock reaches the On Time again – or some other „ON‟ event specified in the Repeat
Schedule and Repeat Pattern registers takes place.
Diagram showing how to connect equipment that is normally OFF to be power ON for a period of time
Equipment
PRC1000
NO
C
NC
NO
C
NC
+
-
NO
Relay 1
Relay 2
PWR
PRC1000
POS NEG
(+) (-)
Battery
+
-