7-8
The panel, battery-backed, unregulated dc bulk power is available from the SPS via the
NAC and the 24V Aux power terminals (1 pair only, ref fig 7-4). NACs not configured
as switched outputs may be configured as auxiliary power point type in the 4100
Programmer. All of these are power-limited.
Review the following guidelines before using the SPS for auxiliary power.
• Voltage rating: 24 VDC (nominal), 2 V P-P ripple (maximum).
• The total auxiliary current available for non-alarm is 5 A. The total current available
for the entire SPS is 9 A, including NAC, auxiliary, and card power.
• All wiring is 0.75 mm
2
to 4 mm
2
.
• All SPS powered field wiring requires a ferrite bead (ref fig 7.1).
• All wiring that leaves the building requires overvoltage protection. Install
module
2081-9044 wherever wire enters or exits the building. A maximum of four 2081-
9044 Modules may be connected to one channel.
• When a NAC is configured as an auxiliary power circuit, no end-of-line resistor
is used.
• External wiring is not supervised unless an end-of-line relay is wired, coil to
auxiliary power, and Normally Open contacts are monitored by a system power
point. Relay current must be considered as part of the load.
• Programming is required for the dedicated Auxiliary Power output (TB3).
• The following devices may be connected to the 2 A Auxiliary Power:
- 2088-series relays and door holders
- 2098-series four-wire smoke detectors
- 2190-series monitor and signal ZAMs
- 4090-series IDNet ZAMs
- 4098-series four-wire smoke detectors and duct detectors
- 2190-9039 Printer
- 4190-9050/9051 4-20 mA ZAMs
- 4603-9101 LCD Annunciator
• The Auxiliary Power output is rated at 2 A dc.
• Where multiple loads are to be connected with individual protection, a Fused DC
Distribution board may be fitted directly to the SPS bracket adjacent to TB3.
Continued on next page
SPS Auxiliary Power Wiring
Overview
Guidelines
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