Sensaphone SCADA 3000 Users manual - Manual (Page 264)

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SCADA 3000 User’s Manual
Figure 1: Mounting Diagram
Power Supply and Grounding
The Relay Output Module operates on 10–15VDC. Typically the module is powered from
the AUX PWR terminals on the SCADA 3000 main unit. This is preferred because the AUX
PWR from the main unit is battery-backed in the event of a power failure, when a battery is
connected to the main unit. Alternately, you may connect the module to any 10–15VDC power
source.
Figure 2: Module powered from main unit
It is extremely important that the EG pin be connected to a good earth ground. This will pre-
vent communication errors due to differences in ground potential between modules in addition
to possible damage due to voltage transients and surges.
The two LED lights in the center of the module, marked Power and Pulse, indicate that the
module is receiving power and operating properly. The Pulse LED will blink at a regular rate,
like a heartbeat, once it establishes communication with the main unit.