Securitron EXD User Manual

Page 14

PN# 500-13350

Page 14

Rev. E, 11/11

To implement lock status reporting, a “B” version Bondstat Magnalock should be employed. Tie
the red and white wires together (this puts +V on the SPDT Senstat common wire). The green
wire will then report +V to the LS terminal when the lock is secure. If the Magnalock stops

reporting secure when it has not been released by the board, the remote alarm relay will
switch 5 seconds later and remain switched until LS again receives +V. The purpose for the 5
second delay is to allow a door to reclose and again report secure after legitimate use. If any
function of the XDT board has released the door, the LS input will be ignored until the board has
relocked the door. This feature allows use of the XDT board to perform exit delay and yet also

report on propped doors or forced doors. If a standard (non-Bondstat) Magnalock is being used
in the installation, a door switch may be employed to largely replicate this function. The switch
should be closed when the door is closed and it should input +V to terminal LS.

7.2 USE OF EXTERNAL SWITCH (BYPASS FUNCTION)
In many installations, authorized entry or exit is desired on an immediate basis without giving

rise to an alarm. This does not violate the delayed exit code, as when the door is in a released
state, it is completely safe. There are two possible variations of external switch use: momentary
timed and alternate. "Momentary timed" means release of the door for a few seconds to allow
an authorized person to enter or exit. Alternate means releasing the door for an extended
period of time. The most common example of this is a situation where the door is released

during working hours and put into delayed exit mode at night and during the weekends.
Turning first to momentary timed release, this is
often from an SPDT relay operated from a
controlled entry device such as a card reader.
Often a keyswitch is used for authorized entry or

exit. Securitron's model MK keyswitch can be
delivered with 2 switches so that when the key is
turned in one direction, authorized release of the
door is obtained. The other direction is used for
relocking after a delayed exit event. The NC
contacts of the external switch are employed to cut

power to the Magnalock and the NO contact
connects to terminal BP. The wiring method is
illustrated in the drawing to the right.

The BP terminal stands for "Bypass" and it is important to understand the use of this terminal in

all external switch applications. When BP receives +V, it immediately releases the lock by
deenergizing the lock control relay. It also suppresses initiation of delayed exit and all board
alarm signals including the remote alarm relay signal that arises from lock status sensing (see
the previous Section). This is important as during authorized entry or egress, it is undesirable to
create delayed exit events or alarm signals. When +V is removed from BP, it maintains the

lock release condition and alarm suppression for 5 seconds. If the external switch is
momentary spring loaded, this 5 second delay arising from the use of terminal BP gives
sufficient time to enter or exit. If it is a timed control relay, the time should be set for 5 seconds
less than the desired time. Once the timed control relay switches back, removal of power from
BP will keep the lock released for an additional 5 seconds.

If the external switch has only NO contacts, the same function may be gained by switching +V
into BP. The reason that the drawing shows an SPDT switch breaking power to the Magnalock
and triggering BP is that this enhances reliability. If a fault were to occur with the XDT board
such that the BP input didn't function, the NC contacts would still release the Magnalock.

For alternate operation, a time clock is used to release the door and suppress all alarms during
the day and then put the door into delayed exit mode at night. The time clock switch simply
closes BP to +V for the time period during which the door is to be released. When it switches
again to open the connection between BP and +V, the door will remain released for an additional
5 seconds but this will be hardly noticeable.

MAGNALOCK

RED

BLACK

EXT SWITCH