Sensaphone SCADA 3000 Users manual - Manual (Page 53)

6-1
Chapter 6: Output Wiring
Chapter 6: OUTPUT WIRING
The SCADA 3000 provides eight latching relay outputs that can be used to switch equipment
on and off. The relays are capable of switching up to 2A at 125VAC and have integral contact
protection. They may be controlled manually while on-line using the SCADA 3000 package,
or automatically via a ladder program or C-program. LED indicators are provided to show
the ON/OFF status of each relay output. Output relays are a latching type and will continue to
hold their state without power.
Notes on Correct Use
The Outputs can be used to control a wide variety of AC and DC devices. However, care must
be taken to insure that the SCADA 3000 is not used in such a way that will severely degrade
the life expectancy of the outputs or cause the unit to malfunction (e.g. microprocessor reset).
Do not continuously apply a voltage higher than the rated maximum voltage to any output.
Do not switch loads that exceed the rated capacity of the output. Avoid switching high-cur-
rent inductive loads as these will generate significant radiated noise when switching, possibly
causing the microprocessor to reset. Also, do not run your output wiring together with your
input wiring. This will almost always cause errors in your input readings because of signal cou-
pling. Be sure to follow National Electric Code guidelines for proper wiring and safety when
working with high voltage circuits.
The wiring diagram below shows a typical switching application:
Figure 1: Output Wiring
The output wiring terminals are designed to accept #14AWG to #24AWG stranded wires.
Select the appropriate cable based on the signal or load you will be switching. Follow all NEC
codes and guidelines as well as local codes required to maintain safety when working with high
voltages. To minimize electrical noise coupling between I/O lines, follow the guidelines listed
below for routing your wires:
• Route output wiring to the unit by a separate path from the input and communi-
cation cables.
• Do not run output wiring in the same conduit with input and communications
wiring.
• Segregate I/O wiring by signal type. Bundle wiring with similar electrical charac-
teristics together.
• Allow at least two inches between the unit and I/O wiring ducts.