Field-Wiring the Modules
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Unimode 400 Installation PN 50710:A 10/22/97 2-33
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MPS-400 terminal TB2 provides three power outputs (each output is power-limited),
shown in Figure 2-45:
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Non-resettable Power (Circuits 1 and 2)
– The MPS-400 provides two 24 VDC
filtered, low-noise, non-resettable power, 1.25 A circuits (TB2 terminals 1 and 2 for
circuit 1; TB2 terminals 3 and 4 for circuit 2). Use these circuits to power notification
appliances, annunciators, and other devices that require low-noise 24 VDC power.
Four-Wire Smoke Detector Powe
r – TB2 terminals 5 (+) and 6 (–) provide 24 VDC
filtered, low-noise, resettable power for four-wire smoke detectors.
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Primary power required for the control panel is 120 VAC or 240 VAC, 50/60 Hz, 3 A.
Overcurrent protection for this circuit must comply with Article 760 of the National
Electrical Code (NEC) and/or local codes. Use 14 AWG or larger wire with a 600-volt
rating.
Once the system is installed, calculate the proper battery rating (Refer to Appendix G,
Power Supply Calculations
). Observe polarity when connecting batteries. Connect the
battery cable to terminal TB1 on the MPS-400. Because AC and battery wiring are not
power-limited, maintain at least 0.25 in. between power-limited and nonpower-limited
wiring. For more information on power limiting, refer to Appendix F, UL
Power-limited Wiring Requirements.
Figure 2-46 shows the terminal connections to TB1 on the MPS-400:
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