Specifications

5
Power supply unit / Important Safety Information
The Power Supply Unit and any other mains-powered equipment (eg Time-
Clock) must be installed in a protected indoor environment such as an
electrical cupboard. The equipment must be installed by a qualified
electrician or similarly competent person and all accepted practices for the
safe installation of electrical equipment adopted. A two-pole switch and
circuit-breaker or fuse, such as provided by a consumer unit or switch-fuse
must be included, to enable the equipment to be fully isolated from the
mains supply during installation or maintenance or in the event of an
emergency.
Electric Lock Release
The 108PLUS Controller PCB provides two alternative pairs of connections
for electric lock releases:-
‘FAIL SECR’ : Use these connections for ‘Fail-Secure’ lock releases.
These devices require power to release the lock and will secure the door
in the event of power failure. These are the most commonly used lock
releases.
‘FAIL SAFE’ : Use these connections for ‘Fail-Safe’ lock releases and
magnetic locks. Both of these devices require continuous power to lock the
door and will release the door if power fails.
These outputs are rated at 12V DC with a maximum current consumption
of 0.5A. For lock releases of higher current specification please refer to the
next section.
High current lock releases
For a lock release or a magnetic lock rated higher than 0.5A or for AC
operation an additional power supply will be required. In addition a relay
must be used to interface with the 108 PLUS. This is illustrated in Diagram
2.
The relay contacts, or the lock-release, must be fitted with a suitable
suppression device to prevent electromagnetic interference being
generated by the coil of the lock release. (Refer to manufacturer for further
advice).
Consideration should be given to the problem of voltage drop at the lock
release. Refer to the manufacturer of the particular lock release for
information on suitable cable length/thickness and power supply rating.