Securitron iEXD-24 - Manual (Page 2)

PN# 500-18900
Page 2
Rev. D, 10/07
delay. If the latch was operable from the outside, delay could be initiated from the outside and
this voids the purpose of the iMXD. Therefore, a card reader mounted on the outside, can
release the iMXD’s magnetic lock but will not make the latch operable from the outside.
Controlled entry can be accomplished with the iMXD only by adding an electric strike or electric
lock which will release the latch from the outside in response to an entry signal from a card
reader or digital keypad. The iMXD includes a “Bypass” function which can release it
simultaneously with the electric strike.
The iMXD also includes integral lock status sensing. Any time that the unit is in a secure
condition, it automatically self-monitors the secure status of the Magnalock. If the Magnalock
fails to internally report secure more than five seconds after the door has been initialized or
relocked following a delayed exit event, the remote alarm relay will signal an alarm condition.
The five second delay is to avoid “false alarms” by allowing a brief period of time for the door to
close and the lock to pull in if, for example, the door was relocked (which powers the Magnalock)
when it was not entirely yet closed.
2. SET-UP PRIOR TO PHYSICAL INSTALLATION
Before physically mounting the unit, it needs to be set up for the specific operation mandated by
local building codes and by the end user. Section 2.1 describes the detailed functions in a
delayed exit application and Section 2.2 provides information on different building code
requirements for North America. Once you have determined precisely how the unit will operate,
Section 2.3 explains Dip Switch setting for the iMXD control board.
2.1. DETAILED DELAYED EXIT FUNCTIONS
Exact code requirements for delayed exit vary somewhat in different jurisdictions. These
variations will be addressed in Section 2.2. In general, however, iMXD delayed exit includes the
following sequences of operation.
In the normal condition, the door is locked. Door movement initiates the exit sequence.
Once the door has moved sufficiently, a nuisance delay period begins. The nuisance delay
period may be set for 1, 2 or 3 seconds. The duration of the nuisance delay period will depend
on the local code and/or on the desires of the end user. The nuisance delay function can also be
disabled. During the nuisance delay period, the internal logic timer provides a pulsing relay
output which operates the on-board Sonalert. This notifies the person at the door that he has
initiated the exit sequence. If he intends to exit, he must maintain pressure on the door,
keeping it open until the end of the nuisance delay period. If he allows the door to re-close
before the nuisance delay times out, the Sonalert will silence and the door will revert to normal
(locked) condition. The sole purpose of the nuisance delay function is to deal with accidental
triggering of the exit sequence. It makes particular sense to employ the nuisance delay in
buildings occupied by a changing population which will not be familiar with the exit control
system. Retail stores or museums are good examples of such buildings.
Once the nuisance delay times out (or immediately if no nuisance delay has been set) the
release delay period begins. The Sonalert output will go from pulsing to steady. This will alert
the person at the door that he need no longer maintain pressure on the door. Once the release
delay begins, it is irrevocable. The door will release at the end of the period. Code mandated
duration of the release delay period is 15 seconds although certain jurisdictions allow extension
to 30 seconds by local building or fire safety officials. The release delay period can therefore be
set for 15 or 30 seconds and this total release delay time includes the nuisance delay. For
example, if a 2 second nuisance delay is set, the remaining release delay will automatically be
13 or 28 seconds for a total of 15 or 30 seconds.
Once the door has released, it will remain released until relocked (reset). Relocking can be
accomplished by one of two methods with the iMXD: a momentary turn of the integral
keyswitch or when the door is actually used (the iMXD automatically detects opening of the
door). Selection between these two methods is done on the iMXD control board and the choice
generally follows local code mandates, although in some cases, it can be according to the choice
of the end user.
As mentioned earlier, the integral Sonalert output is provided to meet the codes. It pulses
during the nuisance delay period, sounds steadily during the release delay period and is off at all