3-6
I
NSTALLATION
Figure 3-6: SE 818 (all suffixes) Lock Power Connections.
Typical (not inclusive)
B
ATTERY
C
ABLE
C
ONNECTIONS
The SE 3718S is designed to operate from a backup battery system of approximately 24V in the
event of a power failure. Unlike previous designs, the requirements of the battery backup system
do not depend on lock voltage settings and use either two 12-volt or a single 24-volt battery.
Connections between the SE 3718S and the various battery configurations using the battery
cable are shown below.
N
OTE
Discharged batteries or batteries of the wrong type are not recognized and, internally, the SE
3718S automatically disconnects itself from them. Ensure that the batteries are fully charged
and are the correct type or equivalent (see Table 1-1).
B
ATTERY
C
ONNECTIONS
S
INGLE
24-V
OLT
S
TANDBY
B
ATTERY
In this mode, the SE 3718S is connected as shown below in Figure 3-7.