- 4 - AL175UL Installation Guide
LED Diagnostics:
Red (DC) Green (AC) Power Supply Status
ON ON Normal function.
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
TRG1 & TRG2
Connects to the normally closed outputs of an access control or fire alarm relay.
These terminals control [LOCK +], and [STRIKE +], as well as AL175UL output relay
contacts [NC, NO, C].
LOCK +
Provides DC output voltage when [TRG1] and [TRG2] are shorted together and are
typically used to power Mag Locks.
STRIKE +
Provides DC output voltage when [TRG1] and [TRG2] are unshorted and are typically
used to power Electric Strikes.
NC, NO, C
Isolated dry form “C” contacts. Shorting [TRG1] and [TRG2] together causes these
contacts to switch. They are typically used for controlling multiple AL175ULs with fire
alarm tie-in (Fig. 5 and Fig. 6, pg. 7).
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. 4, pg. 7).
+ BAT – Stand-by battery connections.
AC FAIL
NC, C, NO
Indicates loss of AC, e.g connect audible device or alarm panel.
Relay normally energized when AC power is present. Contact rating 1A @ 28VDC.
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