Securitron TSH - Manual (Page 3)

PN# 500-17700
Page 3 Rev. C, 08/11
3. ELECTRICAL CONNECTIONS
3.1 SENSOR WIRING
The TSH has 6 colored wires which are for sensor power and DPST relay output:
Red - "+" DC Power
Black - "-" DC Power
White - Relay Common, Pole 1
Green - Relay Normally Closed, Pole 1
Blue - Relay Common, Pole 2
Orange - Relay Normally Open, Pole 2
The relay has 2 amp contacts and when the handle is touched, the relay energizes. Note that the
contacts will also switch if the TSH loses power. For additional safety, the operation of the
TSH is fail safe, itself. When the TSH receives power, its control relay automatically energizes.
It deenergizes when the unit is touched. For applications releasing an electric lock, Figure 3
shows typical connections of sensor, power supply and fail safe (locked when powered) electric
locks. Fail secure electric locks are normally not used with the TSH on required exit applications.
N.O. contacts, however, are available from the sensor for special signaling applications and for
integration with the Request to Exit (REX) function of an access control installation, as will be
explained. Note installation of the MOV in parallel with the electric lock. The MOV is supplied
loose with the TSH. It is a black or blue disk-like component with two bare wires. The MOV
suppresses inductive kickback from the lock which shortens the life of the relay contacts if not
suppressed. It should be spliced in as close to the electric lock as possible. It has no polarity.
If, however, Securitron's Magnalock is used in the installation, the MOV is not
necessary as the Magnalock is internally suppressed.
FIG. 3: TSH WIRING FOR FAIL SAFE ELECTRIC LOCK
The sensor operates on 12-24 volts DC and is normally powered by the same power supply that
operates the electric lock. When connecting power, polarity must be observed. Note that
the sensor draws 40 mA when "at rest" and 25 mA when it is releasing the lock. As an
additional safety feature, the TSH includes a low voltage sensing circuit. The unit will keep
working normally if input voltage declines until it reaches roughly 9 volts. At that point, the TSH
will automatically act as if all power was removed. If a lock is being controlled, it will release.
Input voltage could decline if the unit was being operated on batteries and the batteries were
discharging or because of a fault in the power supply.
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.
CABLE
RED (+ POWER)
BLACK (- POWER)
WHITE (RELAY COM1)
GREEN (RELAY N.C.1)
POWER SUPPLY
12-24 VDC
+
MOV
MAGNETIC
LOCK
NOTE 1: MOV NOT NEEDED IF SECURITRON MAGNALOCK USED
NOTE 2: POWER SUPPLY MUST ALWAYS CONNECT DIRECTLY TO SENSOR.
NOTE 3: POLARITY MUST BE OBSERVED WHEN CONNECTING POWER.
OTHER CONTROL SWITCHES SHOULD BREAK OR PARALLEL RELAY CONTACTS AS NEEDED.