LED Diagnostics:
Red (DC)
Green (AC)
Power Supply Status
ON
ON
Normal operating condition.
ON
OFF
Battery backup is powering output.
OFF
ON
No DC output.
OFF
OFF
Loss of AC. Discharged or missing stand-by battery. No DC output.
Terminal Identification:
Terminal Legend Function/Description
AC
Low voltage AC input.
TRG1 & TRG2
These input terminals are designed to connect to the normally closed outputs of an access control or
fire alarm relay. These terminals control [LOCK+], and [], as well as AL175ULB output
relay contacts [N.C., N.O., C]
LOCK +
This terminal provides DC output voltage when [TRG1] and [TRG2] are shorted together and are
typically used to power Mag Locks.
This terminal provides DC output voltage when [TRG1] and [TRG2] are unshorted and are typically
used to power Electric Strikes.
N.C., N.O., C
Isolated dry Form “C” contacts. Shorting [TRG1] and [TRG2] together causes these contacts to
switch. They are typically used for controlling multiple AL175ULBs with fire alarm tie-in
(Fig. 4 and Fig. 5, pg. 4).
AUX+
Continuous positive (+) DC power output voltage. It is not affected by TRG1, TRG2 operation.
COM --
Common negative (-) output (ground).
FACP
Spare wiring terminal used for fire alarm tie-in application (Fig. 3, pg. 4).
+ BAT --
Stand-by battery connections.
AC Fail
N.C., C, N.O.
Used to notify loss of AC e.g connect audible device or alarm panel relay normally energized when
AC power is present. Contact rating 1A @ 28VDC.
AL175ULB
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