Securitron TSH - Manual (Page 4)

PN# 500-17700
Page 4 Rev. C, 08/11
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 TSH’s two pole relay. The
TSH'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
achieved.
FIG. 4: TSH DOUBLE BREAK WIRING
CABLE
RED (+ POWER)
BLACK (- POWER)
WHITE (RELAY COM1)
GREEN (RELAY N.C.1)
POWER SUPPLY
12-24 VOLTS
+
MOV
ACCESS CONTROL
REX INPUT
ACCESS CONTROL
LOCK CONTROL
NC CONTACTS
BLUE (RELAY COM2)
ORANGE (RELAY N.O.2)
MAGNETIC
LOCK
NC
NC
3.3 ALL SECURITRON EQUIPMENT INSTALLATION
Figures 3 and 4 show "generic" use of the Touch Handle 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
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.
3.4 CAUTION ON USE WITH PROXIMITY CARD READERS
When a proximity card reader is used for entry and a Touch Handle is used for egress, there is a
small possibility of interference. The proximity reader projects an electric field of considerable
intensity and we have seen rare cases where this can be picked up by the TSH. It depends on
the power of the proximity reader and the nearness of the reader on the outside of the door to
the handle on the inside. To make sure a problem does not exist after the installation is
complete, perform the following test. Turn the sensitivity up as high as you can to the point just
before it is open all the time (see Section 3.6). Then, from the outside of the door, place your
hand on the reader and lean your body against the door to see if the handle can be triggered.
The effect of coupling the reader's energy though your body into the door, tends to increase the
sensitivity of the handle.
If you find that the unit triggers from this test, there is some interference. You have two
options. It may be that the interference is so little that when the sensor is adjusted down, there
is no risk of triggering from the outside. You can experiment with this. Alternately, Securitron
has developed a simple filter circuit which will absorb the interference from the reader. This
requires a 22,000 Micro Henry inductor (DigiKey part # M7223-ND, JW Miller part # 70F222AI).
You can purchase this part at a local electronics parts supply house or from Securitron. To
install the inductor, identify the ring terminal with brown wire which connects the “antenna”
screw on the back side of the aluminum handle to the circuit board. Clip this wire and splice in
the inductor. As the inductor is an insulated part, it can lay in the cavity in the plastic base on
top of the circuit board.