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4-3
• The bulk supply (rated at 9A max) which feeds 24V Sig, 24V Card, 24V Aux also
supplies the SPS Card including the on board IDNet, and the battery charger. The
charger is disabled during alarms so as to make the 9A available on the other busses.
(See the following table for the SPS current).
• +24V Sig is used to supply the NACs. It can be made accessible for other use by
configuring a NAC as an auxiliary power output (normally energized).
• The battery circuit is checked every 29 seconds. The battery test is programmed via
custom control for a 1 hour test once per week.
• The battery is connected to the charger but is normally disconnected from the bulk
supply. During mains fail or the 1 hour battery test, the battery gets connected to the
bulk supply.
• The IDNet output is 30V in the normal condition so as to prolong battery standby.
When it is necessary to activate large numbers of output devices on IDNet
peripherals (such as piezo sounders), the output voltage is increased to 35V to
provide sufficient voltage at the end of line to activate piezo sounders. The higher
voltage state is an alarm condition for the purpose of standby battery calculation.
The following table summarizes battery standby capabilities for the SPS. Voltage
assumed is 24 V, which is the rated battery voltage for lead-acid type batteries.
Table 4-2. SPS Current Specifications
Standby Conditions Current
• No alarms (NACs normal)
• IDNet LED ON, no IDNet devices connected
175 mA
Add to above for each additional set of 50 IDNet devices in
standby, with IDNet at 30 V
40 mA
Total current for fully loaded IDNet channel (250 devices) in
standby
375 mA
Alarm Conditions Current
• 3 NACs ON
• IDNet LED ON, no IDNet devices connected
185 mA
Add to above for each set of 50 IDNet devices in alarm, 20
LEDs ON
80 mA
Add to above for each set of 50 IDNet devices in alarm, LEDs
OFF
50 mA
Total current for a fully loaded IDNet channel (250 devices) in
alarm, 20 LEDs ON
475 mA
Notes:
• Additional standby conditions: Trouble relay activated, power trouble LED
on, IDNet LED on, battery charger off, auxiliary power load = 0 mA
Continued on next page
SPS Specifications, Continued
SPS Current
Consumption