Specifications

Section 2: System Description
2-15
POWER SUPPLY/BATTERY ENCLOSURE
The enclosure provides a battery space that measures 4.9 inches (11.2 cm) by 15 inches (38 cm)
by 4 inches (10.2 cm). Batteries housed within the cabinet must be sealed, lead-acid batteries
limited to 16 AH.
The enclosure is fabricated from 18-gauge steel, is louvered for cooling, and has a key-lockable
door. The enclosure dimensions are 11 inches (28 cm) high by 15 inches (38 cm) wide by 4 inches
(10 cm) deep.
2.2.5 POWER INSERTER*
The Power Inserter, PI-1 for 115 VAC or PI-2 for 220VAC, is a low-voltage, unregulated power
supply and battery charger circuit. It provides output power of +24 VDC. It may be used for S-
Net devices or door locks. When the AC power input fails and an optional 24 VDC backup battery
is installed, the battery charger circuit activates the battery to provide uninterrupted output power.
The optional backup battery is kept fully charged by the battery backup circuit and is not required
for normal operation (i.e., when the AC input is present).
Connected to the Alto 818, a single PI can provide the S-Net with enough power to control up to
eight doors. The specific power requirements are dependent on the types and number of devices
on the net, the wire gauge used, and the total net length. Multiple PI's can be used to provide
additional power.
*
This item are not UL 294 listed. It may not be used in an access control system which must
meet UL 294 specifications.