AL175220 Series
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3. Set the unit to the desired DC output voltage by setting switch SW1 to the appropriate position
(Power Supply Output Specification Table, pg. 2).
4. Measure output voltage before connecting devices. This helps avoiding potential damage.
5. Connect battery to the terminals marked [+ BAT –] (battery leads included).
Use two (2) 12VDC batteries connected in series for 24VDC operation.
Note: For Access Control applications batteries are optional. When batteries are not used, a loss of AC will
result in the loss of output voltage. When the use of stand-by batteries is desired, they must be lead acid or
gel type.
6. Connect appropriate signaling notification devices to AC Fail supervisory relay outputs marked [NC, NO, C].
7. For Access Control Device & Fire Alarm Interface connections refer to the desired Application Diagrams
(pgs. 5-6) and Terminal Identification Chart (pg. 3).
Maintenance:
Unit should be tested at least once a year for the proper operation as follows:
Output Voltage Test: Under normal load conditions the DC output voltage should be checked for proper
voltage level (see Power Supply Output Specifications Chart).
Battery Test:
Under normal load conditions check that the battery is fully charged, check specified
voltage both at the battery terminal and at the board terminals marked [+ BAT –] to
ensure that there is no break in the battery connection wires.
Note:
Maximum charging current under discharges is 400mA.
Note:
Expected battery life is 5 years; however, it is recommended changing batteries in
4 years or less if needed.
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 [], as well as AL175(X)220 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.
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 AL175(X)220s with
fire alarm tie-in (Fig. 5 and Fig. 6, pg. 6).
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. 6).
+ 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.
