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Rev. A.5, 8/03 Page- 17
3.7 DOUBLE DOOR CONTROL SWITCHING
It’s common to control two locks from a single access and/or exit switch on double doors or on
an installation where two locks are mounted on a single door. In nearly all cases, this works
with no problem but occasionally the release can appear to be “sticky” for similar reasons to
those discussed in Section 3.3 This happens when one of the locks is poorly coupled to its
strike plate. This could occur because of an installation problem (the strike plate is not being
allowed to swivel) or because of some obstruction between the plate and magnet surface.
When an electromagnet is not well coupled to its strike plate, its magnetic field collapses so
rapidly that it provides some energy to recirculate in the second magnetic lock, slowing the
release of that lock.
FIG. 17: DOUBLE POLE SWITCHING OF TWO LOCK INSTALLATION
RED
BLK
POWER
SUPPLY
+
MAGNALOCK #1
MAGNALOCK #2
RED
BLK
TWO POLE
SWITCH
So if you notice slow release on a double lock installation, this is telling you that one of the locks
is not holding properly and that the problem should be corrected. Alternately, any chance of
slow release can be eliminated by controlling the two locks with a double pole switch or relay.
This blocks the recirculation path and is shown in Figure 17.
3.8 EMERGENCY RELEASE
Magnalocks are often wired into a system such that they can be released in an emergency --
either manually from one switch or automatically, often from the fire alarm system. It is the
user's responsibility to accomplish this hookup correctly according to these instructions and
good electrical practices. In general, we recommend that a switch or relay be used to perform a
series break of all DC power which is the simple and sure way to make sure the doors do
release. Securitron power supplies have terminals for interconnection of such emergency
release switches. Finally please note that
it is the responsibility of the end user and
dealer/installer to insure that Magnalock installations comply with any applicable fire or
building codes.