Specifications

Section 2: System Description
2-13
2.2.3 SE 3708C* POWER MODULE WITH BACKUP
BATTERIES
The SE 3708C can operate on either a primary AC line or on a standby battery pack. At facilities
without emergency power systems, the SE 3708C can provide emergency power to maintain the
operation of the Alto 818 in the event of a power failure. This power module can be ordered with
a 50/60 Hz AC power input of either 120 VAC or 230 VAC. In addition to the AC power for the
ACU, lock power of 12 or 24 VDC is provided.
2.2.4 ALARM-SAF POWER SUPPLY/BATTERY
CHARGER MODEL AS/PS5-BFS-24-UL
The Alarm-Saf Model AS/PS5-BFS-24-UL is a UL-listed 24 VDC, 4-amp power supply battery/
charger which is complete with an internal stepdown transformer, and louvered cabinet with key-
lockable door. The unit is thermal and reverse polarity protected. It may be used to provide DC
power for S-Net devices and lock power.
Table 2-4: Alarm-Saf Specifications
Operat ing Temperatures 32° to 120° F(0° to 49° C)
Maximum Humidity 85% at 85° F (20° C)
Input Voltage 120 VAC ± 10%, 60 Hz, single phase
Input Current 2.5 amps, maximum
Output Power
24 VDC, regulated at 4 amps, maximum
Ripple (RMS)
0.005 VDC at 0.5 amp load, 0.350 VAC at 4.0 amps
LED INDICATORS
The Alarm-Saf Power Supply printed circuit assembly (PCA) has three LEDs to indicate
operational status. These LEDs are listed and described in Table 2-5.
*
These items are not UL 294 listed. They may not be used in an access control system which
must meet UL 294 specifications.