SPS NAC Field Wiring Guidelines, Continued
Some or all of these output functions could be implemented using addressable
devices or other relay modules instead, in which case the corresponding NAC output
could be reassigned to other uses. The new configuration would require full testing
of these functions to ensure compliance with AS 4428.1.
To connect the SPS to reverse-polarity, non-addressable notification appliances using
Class A wiring, read the following instructions and refer to the figure below.
1. Route wire from the “B+”, “B-”, outputs on TB2 of the SPS to the appropriate
inputs on a peripheral notification appliance. Use NAC1, NAC2, or NAC3 as
required.
2. Route wire from the first appliance to the next one. Repeat for each appliance.
3. Route wire from the last appliance to the A+ and A- inputs on the same NAC
circuit of TB1 of the SPS.
4. Repeat steps 1 through 3 for each NAC output you want to use.
5. Leave the 10 K, ½ W, brown/black/orange resistor (378-030) on each the “B+”
to “B-” terminals of each unused NAC. No external end-of-line resistor is
needed for circuits in use.
6. If the appliance/device to be used does not have an integral diode, a sufficiently
rated blocking diode must be fitted between the incoming +ve wire and the +ve
terminals of the device with cathode (stripe) to the device.
Figure 5-2. Class A (loop) NAC Wiring
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