© AGRGS 2016 | Data subject to change without notice
67385867493098462 | en, eu, V5, 07. Oct 2016, page 42
8.3.7 Important notes on the use of locks and latches
It is strictly forbidden to use locks without connected protective diodes!
EMF of self-
circuit can reach several hundred volts.
If there is no protective diode, an erosion of relay contacts occurs due to sparking
and it leads to a relay failure. And the use of a shared PSU for both the lock and the
controller will cause controller malfunctioning due to high voltage interference in
power supply lines.
When the controller power supply is used to power the lock, it is forbidden to
connect the power supply lines of the lock directly to + Vin and -Vin terminals of
the controller.
The power supply lines of the controller and locks should begin right at the power
supply terminals.
Failure to meet this requirement can lead to voltage surge on controller terminals,
when actuating the lock that consumes a large current. Such power surge can lead
to controller malfunctioning.
When controlling electromagnetic locks that lock by voltage supply, it is forbidden
to use NC2, COM2 (for the first door) contacts or NC4, COM4 contacts (for the
second door) instead of NO1, COM1 contacts (for the first door) or NO3, COM3
contacts (for the second door).
When controlling electromagnetic locks that unlock by voltage supply, it is
forbidden to use the NC1, COM1 contacts (for the first door) or NC3, COM3 (for the
second door) instead of contacts NO2, COM2 (for the first door) or NO4, COM4 (for
the second door).
I.e. locks must unlock during blackouts.
Failure to meet this requirement can lead to an uncontrolled locking of locks, e.g.
when controller power supply circuit is interrupted.
It is strictly forbidden to use electromagnetic latches unlocking by voltage supply
but not providing long-lasting work when voltage is supplied!
When unlocking the door by software or in the event of fire, the voltage is being
supplied to the latch for an arbitrary long time.
The use of latches that can withstand only a short-term voltage supply (e.g.
FERMAX) will cause burnout of latch winding and its uncontrolled locking, which
may lead to loss of life!
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