
Powering expanders from the auxiliary power terminals
Battery Status
ON: battery voltage has dropped below the deep discharge level (10.9 V)
OFF: battery status OK
Mains Supply
ON: Mains failure
OFF: Mains OK
X-BUS Status
ON: X-BUS configuration is a loop configuration
OFF: X-BUS configuration is an spur configuration
FLASHING: Detects end of line Expanders or break in wiring.
System Fault
ON: a hardware fault has been detected on the board
OFF: no hardware fault has been detected
Writing to Flash
ON: system is writing to flash memory
OFF: system is not writing to flash memory
Heartbeat
FLASHING: system is functioning normally
21.3 Powering expanders from the auxiliary power
terminals
The auxiliary 12 V power terminals on the SPC controller
(0 V, 12 V) share a power supply (750 mA) with the Darlington outputs (OP4, OP 5,
OP6) enabling connection to a number of external devices and/or expanders to the
Controller.
To calculate the number of expanders/keypads that can safely be powered from
the auxiliary power terminals, add the total maximum current draw from all of the
expanders/keypads to be powered and determine if this total is less than 750 mA.
Please refer to corresponding installation instruction or data sheet of modules,
keypads and expanders for current consumption.
Expander 1 Current (mA) + Expander 2 Current (mA) + ….. <750 mA
If the Darlington outputs (OP4, OP5 & OP6) are already powering external devices
then the power supplied to these devices from the 750 mA supply must be
subtracted to determine the amount of available power from the auxiliary power
terminals (0 V 12 V).
If the total maximum current draw from the expanders exceeds 750 mA then a PSU
expander should be used to provide additional power.
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