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Double Break Wiring
Many installations include a controlled access device
such as a digital keypad or card reader. Such devices
typically have a REX (request to exit) input. When
dry contacts close on this input, the entry device will
open the lock for the same amount of time that is
programmed for entry. Use of the REX input for exit
has two benefits: you pick up timed exiting and also in
the case of most entry controls, the REX input must be
used for exiting to avoid an alarm condition at the door.
All Securitron Equipment Installation
Diagrams 6 and 7 show "generic" use of the Securitron
Touch Bar with any type magnetic lock and power
supply. Often, Securitron supplies all of these
products and the installer expects an interconnection
drawing for all Securitron products. We provide such
drawings in many of our manuals. In this case, the
replacement of the generic products shown above
with Securitron products is so simple as not to require
separate drawings. Just note that for any Securitron
Adjusting Sensitivity
With wiring completed, sensor adjustment should be set.
NOTE: that the sensor board has a potentiometer on it
accessible when the bar's end cap is removed (see Diagram 8).
The potentiometer has a small red LED light
installed in front of it that will aid you in adjusting
the sensitivity. The potentiometer on the sensor
will increase sensitivity when turned clockwise
and decrease it when turned counterclockwise.
1
TURN the pot clockwise without touching the bar
with a small flat blade screwdriver until you see
the red LED light turn on; you should also hear
the relay click off. In this condition, sensitivity is
so high that the bar is "sensing" all of the time.
Use of Redundant (Backup) Switch and Labels
A red push switch is mounted on the rear of the bar.
The purpose of this switch is to provide backup in case
of any malfunction or mis-adjustment of the sensor.
Pushing the button breaks the connection between the
WHITE (COM1) and GREEN (NC1) wires just the same
way as if the bar was touched. It therefore provides
a "hard" backup circuit break which will release the
controlled fail safe lock. It does not however affect the
COM2 and NO2 circuit (BLUE and ORANGE). If these
NO contacts are being used, for example, to provide
REX input to an access control system, pushing the
backup button will not achieve this, but egress safety is
maintained as with the switch mounted, there are two
independent controls which can release the door. In the
event that the sensor fails, the button will still work.
If the REX input alone is used for exiting a safety
reliability problem will exist. If the entry device
malfunctions, exit will not be possible and people
may be trapped. We therefore always recommend
double break wiring which is supported by the
Securitron TSB because of its two pole relay. The
Securitron TSB's NC contacts are used to break power
to the fail safe electric lock while its NO contacts
trip the REX input of the controlled entry device.
This releases the lock a second time, hence the
term, "double break". If the controlled entry device
fails for any reason, direct exit is still possible.
Magnalock, the red wire denotes the "+" input and
the black wire denotes the negative. Remember that
you don't need to install the MOV with any Securitron
Magnalock. Securitron offers a wide range of different
power supplies, so it is necessary to consult the
individual power supply manual to identify the DC
output terminals. Then connect the power supply
outputs to the rest of the system as shown above.
2
SLOWLY ROTATE the pot counter-clockwise
until you see the red LED light turn off
(you should hear the relay click on).
3
THEN ROTATE another 15 degrees counter-
clockwise. This is generally a good setting.
4
BEFORE REPLACING THE END CAP, experiment
by touching the bar and observe that the
lock releases. Experiment with gloves if
you expect that they will be used. You
may want to increase the sensitivity
somewhat, but if you leave it just below
the point where it is continuously released,
you risk a condition where the unit will
fail by being released all the time.
A label is supplied which should be affixed to
the bar (see Diagram 9) to draw attention to the
backup switch. Application of the label is particularly
important where people encounter the bar whom are
not familiar with it such as in a public occupancy. The
label includes two arrows owing to the uncertainty
of which end of the bar it will be mounted on.
A second label stating "PUSH TO EXIT" is also
shipped with the bar. If desired, this label can
be affixed to the front center of the bar itself in
order to prompt users that the bar (rather than
the door) must be pushed to gain egress.
Diagram 8 End view of
sensor/circuit board
Ring terminal makes
contact from sensor
Cable Connector
to bar
(Male)
Potentiometer
Backup Push
with red LED in
Button
front of it
(on opposite side)
Diagram 9 Emergency
Release Button
E ME RG EN C Y
R E L EA SE
B U T TO N
Circuit
Board
5 of 8
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