Edwards Signaling EBPS Remote Booster Power Supply - Manual (Page 12)

6 Remote Booster Power Supply Technical Reference Manual
LED indicators
The BPS has seven LED indicators. See “Component descriptions” for the
location of the LEDs.
Table 1: LED indicators
LED Color Description
AC Green AC power on.
NAC1 Yellow NAC1/AUX1 trouble [1].
NAC2 Yellow NAC2/AUX2 trouble [1].
NAC3 Yellow NAC3/AUX3 trouble [1].
NAC4 Yellow NAC4/AUX4 trouble [1].
BAT Yellow Battery trouble. Indicates that the battery level has fallen below
acceptable levels.
GND Yellow Ground fault. Indicates that a ground fault has been detected on
the field wiring.
[1] The NAC LEDs indicate a trouble with the load or external wiring on the NAC/AUX circuit. For
circuits configured as NACs, this could be an open circuit trouble, short circuit trouble, or an
overload trouble.
For short circuit troubles, the NAC does not activate until the short circuit condition is removed.
For overload troubles, an active NAC is shutdown. After shutdown, if there is no short circuit
condition, the NAC reactivates after 30 seconds and checks to see if the overload condition still
exists.
For AUX circuits, the trouble indicates an overload condition. The AUX circuit is shutdown for
30 seconds and then is reactivated to see if the overload condition still exists.
Trouble indicating and reporting
When the BPS trouble relay is not dedicated to AC power loss reporting (DIP
switch SW2-6 OFF), the trouble conditions listed in the table above are reported
through the trouble relay. Other internal troubles that do not have an associated
LED are also reported via the BPS trouble relay. Other internal troubles include:
DIP switch read trouble, RAM failure, code checksum failure, A to D failure, and
battery charger failure.
All troubles are also reported through both sense circuit trouble relays.