Access control applications
EST3 Installation and Service Manual 3.35
Power for continuous locks
Description of the application
By continuous locks, we mean locks that operate, on average,
more than 30 seconds in every minute. Normally, power for the
lock is taken from the CRC battery. However, for continuous
locks there is not enough recharge time for the CRC battery to
keep up with the drain. Consequently, the CRC must be
configured so that an external power supply operates the lock.
The CRC can be powered by the 3-PPS/M, by a CRCXF (CRC
Transformer), or by a remote 24 Vdc power supply. Any of these
supplies is suitable for powering continuous locks. (See the
topics “Power from an AC source” and “Power from a remote
source” for more information about these options.)
A typical application using continuous locks is shown in Figure
3-12, below.
3-SAC3-PPS/M
CRC
Strike or
maglock
Card
reader
24 Vdc
SAC bus
Control panel
Power supply
Other factors
Hardware configuration
SDU programming
ACDB/KDC operation
X
X
X
24 Vdc remote
power supply or
CRCXF
transformer
Figure 3-12: CRC controlling a continuous lock
The figure shows the power coming from the 3-PPS/M in the
control panel. This power supply could be used to operate the
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