Securitron DPA_Series - Manual (Page 2)

PN# 500-15700
Page 2 Rev. C, 04/11
The next stage is pre-alarm. If the door has not been reclosed/resecured before the end of the
authorized condition (time range one), relays #1 and #2 energize and time range two
begins. Relay #1 is connected to the Sonalert on the BA-DPA enclosure and the Sonalert will
sound at the door. Relay #2 is connected to the LED. Naturally, if you have purchased only the
board, it will be up to you how to connect these relays. Time range two can be digitally set for
0, 15, 30 or 60 seconds.
Note that when time range two is set to zero, the pre-alarm condition is eliminated and the
board goes directly into the alarm condition at the end of time range one.
The Sonalert sounding at the door during time range two should alert someone in the area to
resecure the door before the end of time range two. If this is done, the DPA returns to the
normal condition. If time range two expires with the door still not closed/secure, the DPA goes
into its final, alarm stage.
In the alarm stage, relay #1 follows the door/lock status. If the door is resecured, it will
deenergize. Otherwise, it will stay energized. Relay #2 remains energized. In the BA-DPA
version, relay #2 operates the LED. This provides a "memory" indication that this particular
door is the one which went into the alarm stage. Remember that the Sonalert will stop if the
door is reclosed/resecured. In the alarm stage, relay #3 deenergizes which is its alarm
condition (relay #3 is normally energized). Relay #3 is normally used to summon building
security personnel as in the alarm stage, the door is considered to have been propped open too
long. The reason that relay #3 is normally energized is to provide an alarm signal if
power to the DPA is interrupted. This calls for an alarm signal as the door is no longer being
monitored. Note that when you wire relay #3 while referring to Figure 1, the contacts are
labeled in their deenergized condition. This is the alarm condition as relay #3 is normally
energized.
The alarm stage is not limited by time. Recovery consists of resecuring/reclosing the door and
then executing a reset. If the door remains propped, reset is not possible. The reset signal can
be from a separate switch, such as a keyswitch at the door. This requires security personnel to
physically check the door. Alternately, reset can be taken from a door switch so that it will be
automatic when the door recloses. Figure 2 shows a graphic representation of basic operation of
the DPA, which makes the sequence of operation easier to understand.
FIG. 2: BASIC OPERATION OF THE DPA
RELAY #1
RELAY #2
RELAY #3
D
E
D
E
D
E
NORMAL
CONDITION AUTHORIZED
CONDITION PRE-ALARM
CONDTION ALARM
CONDITION RESET
(NORMAL)
E = ENERGIZED
D = DEENERGIZED
= DOOR OPENS
= DOOR RESECURES
TIME
RANGE
#1 TIME
RANGE
#2
A single graph cannot show all the operating features of the DPA, but Figure 2 does display the
basics of the product. Note the events that distinguish between the conditions. The authorized
condition begins when the door opens or becomes insecure. Time range one defines the length
of the authorized condition unless the door recloses before the end of time range one, in which