Securitron DKC - Manual (Page 8)

PN# 500-33510
Page 8 Rev. A, 06/13
When using exit switches, the possibility must be considered that an electronic failure may occur
to the DKC and a person will not be able to exit. If the DKC controls the only door exiting the
area, additional steps should be taken to improve the reliability of exiting so as to avoid trapping
someone. This can most easily be done by implementing a secondary means of releasing the
lock not dependent on the DKC's REX input. Additional switch contacts should be used that
directly control the electric lock. In the case of a fail safe lock, which should always be employed
when there is only one exit path, this can be easily accomplished with "double break" wiring
between the exit button, electric lock, and DKC. If the exit button has a set of normally open
and normally closed contacts, it should then be wired according to Figure 8 or Figure 9 below.
When the exit button is depressed, its normally closed contacts directly break power to the lock
while its normally open contacts activate the DKC. If for any reason a failure occurs with the
DKC, a person can still exit by holding the exit button down while pushing the door open.
Always consult local building or fire department when securing doors that are part of
an emergency exit path to ensure compliance with local codes.
DKC
COM
DOUBLE BREAK WIRING FOR FREE EGRESS (SPDT SWITCH)
Figure 8
NC
FAIL SAFE LOCK
WHEN THE EXIT SWITCH IS ACTIVATED, THE NC CONTACTS OPEN WHICH
RELEASE THE FAIL SAFE LOCK. AT THE SAME TIME, THE NO CONTACT DIRECTLY
ACTIVATES THE REX INPUT. THIS DEENERGIZES THE LOCK CONTROL RELAY
WHICH RELEASES THE LOCK “A SECOND TIME” FOR THE AMOUNT OF TIME THAT
HAS BEEN PROGRAMMED. IF THE DKC SUFFERS A FAILURE, THE EXIT SWITCH
CAN STILL RELEASE THE LOCK FOR SAFETY.
REX
DC
+
DC
‐
SPDT
SWITCH
+
‐
NO
NC COM
DKC
COM
DOUBLE BREAK WIRING FOR FREE EGRESS (TWO POLE SWITCH)
Figure 9
NC
FAIL SAFE LOCK
WHEN THE EXIT SWITCH IS ACTIVATED, THE NC CONTACTS OPEN WHICH
RELEASE THE FAIL SAFE LOCK. AT THE SAME TIME, THE NO CONTACTS CLOSE
WHICH ACTIVATE THE REX INPUT. THIS DEENERGIZES THE LOCK CONTROL
RELAY WHICH RELEASES THE LOCK “A SECOND TIME” FOR THE AMOUNT OF
TIME THAT HAS BEEN PROGRAMMED. IF THE DKC SUFFERS A FAILURE, THE EXIT
SWITCH CAN STILL RELEASE THE LOCK FOR SAFETY.
REX SRC
DC
+
DC
‐
2 POLE
SWITCH
+
‐
NO NO
NC NC
Man trap Function
The DKC can be set up to operate two doors to work together as a man trap function. In order to
use the man trap function, the DKC must be programmed with a user code on each door. The
door position switches must be connected to each door as in Figure 10. The DIP switch 1 labeled
“Man Trap” must be switched to the ON position. Always consult local building or fire
department when securing doors that are part of an emergency exit path to ensure
compliance with local codes.
Anti-Tailgating
Particularly when using the longer time ranges, the user
may be concerned that after an authorized person has
used the door, a second unauthorized person can also
use it before the lock has reset. By the addition of a
door switch which opens when the door opens, the DKC
can be made to re-engage the lock as soon as the door
has re-closed regardless of the status of the timer. This
feature can be implemented either using the DKC
Programming Tool or using a system keypad.
ANTI‐TAILGATING
Figure 10
CONNECT A DOOR
SWITCH WHICH OPENS
WHEN THE DOOR OPENS
DOOR
SWITCH
+12V
DOOR
POS