Securitron XDT_Series - Manual (Page 5)

PN# 500-14900
Page 5 Rev. D, 06/11
is a security feature. The local alarm relay will remain deenergized and therefore not signal at
the door as the local alarm relay is intended to signal a delayed exit event and without power,
the board is not capable of producing such an event; the lock is immediately released upon loss
of board power.
If the system has been approved for the use of battery backup, loss of building power will not
immediately alter anything at the door as the batteries will take over. If power is out for an
extended period of time, however, the batteries will begin to drain and lose voltage. As an
additional safety feature, the XDT includes a low voltage sensing circuit. The board will
keep working normally as the voltage declines until it reaches roughly 70% of nominal. At that
point, the XDT will automatically act as if all power was removed. The lock releases and the
remote alarm relay deenergizes, signaling trouble at the door.
6. WIRING
Six additional components are needed to create a delayed exit installation built around the XDT:
Power supply, fail safe lock, initiate switch, reset switch, local alarm sounder and MOV.
Interconnection of these components is shown in the drawing below. The MOV is a "button" like,
2 wire component packed with the XDT board. It is installed in parallel with the fail safe lock
and its function is to absorb the inductive kickback which is generated when the lock is switched
off. If the MOV is omitted, electronic noise from the lock may interfere with proper operation of
the board and relay life will be shortened. If you are used Securitron's Magnalock in the
installation, the MOV may be omitted because the Magnalock has internal inductive kickback
protection.
FIG. 2: TYPICAL XDT WIRING
NO
NC
C1
C2
C3
NC
NC
NO
NO
0V (NEG)
+V
RESET (NC)
INITIATE (NC)
F
R
O
M
P
O
W
E
R
SU
PPL
Y
FAIL SAFE
LOCK
LOCAL
ALARM
MOV
NOTE: MOV NOT NEEDED IF SECURITRON MAGNALOCK IS USED
+
LS
BP
FE
IN
RS
DC
Note the following points refer to the drawing on this page.
The board receives 12 or 24 VDC according to the version selected.
Power must be supplied at all times except in the event that the fire alarm system activates.
The switches used for delay initiation and reset (relocking) must be normally closed.
The fail safe lock operates on the same power that operates the board so that it will be safely
released in the event of a fire.
The local alarm is typically a Sonalert or other DC horn.
As factory delivered, terminal "+" is jumpered to "LS" to disable lock status sensing. This
optional monitoring feature is described in section 7.1.
The MOV supplied with the XDT must be wired as shown, unless Securitron's Magnalock is
used as the locking device.