ADT Unimode 400 Multi-Net Installation Manual page 94

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Figure 2-74 shows a supervised and power-limited NFPA Style Y NAC using an
M500CH module. This shows polarized alarm notification appliances connected to
M500CH modules in a two-wire configuration. An M500CH module can control 2 A
of resistive load (on electronic devices) or 1 A of inductive load (on mechanical bells
and horns). If installing more than one M500CH NAC, install the power supervision
relay on the 24 VDC power bus after the last M500CH.
• Do not T-tap or branch a Style Y circuit.
• Terminate the circuit across the last device using a 47K, 1/2-watt ELR
(PN ELR-47K).
• Do not run wiring under any terminals. To maintain supervision, break the wire
run.
Connect the NAC as follows:
1. Connect the SLC to M500CH terminals 1 (–) and 2 (+).
2. Connect 24 VDC power to MPS-400 TB2 (Figure 2-74).
3. Set the M500CH rotary switches to the required SLC address. (The M500CH
takes one module address on the SLC.) For instructions on setting rotary switches,
see Figure 2-67 on page 2-49.
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Unimode 400 Installation PN 50710:A 10/22/97