Securitron TSH, Installation And Operation Instruction Manual

Page: 4 / 8

Rev. 8/00 Page- 4
3.2 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 has been programmed for
entry. Use of the REX input for exit has two benefits: you pick up timed exiting and also with
most controls, the REX input must be used for exiting to avoid an alarm condition at the door.
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