Tyco 4100U installation manual SPS NAC Field Wiring Guidelines, Continued, 2.Class A NAC Wiring

SPS NAC Field Wiring Guidelines, Continued

Class A NAC Wiring	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 (between 0.75 mm2 and 4 mm2) 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 configured..
	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 to the device.
								BLK
							RED			0.75 mm2 to 4 mm2
			TYPICAL
			APPLIANCE
Important: Conductors must test free of RED								BLK
all grounds.			TYPICAL							Leave the 378-030 EOL
			APPLIANCE							Resistor (10 K Ohm, ½ W;
										brown/black/orange) on
										unused B+/B- terminals
			RED			BLK
	Ferrite beads
	required for EMC
	compliance. Use
	SX0005 or kit							NAC2	NAC3
	4100-5129.
		3	P1
		2
		1
				B+ B- A+ A-				B+ B- A+ A-	B+ B- A+ A-
					NAC1			NAC1	NAC1
					LED1			LED2	LED3

Figure 7-2. Class A NAC Wiring

Continued on next page

SPS NAC Field Wiring Guidelines, Continued

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