Securitron DPA_Series - Manual (Page 6)

PN# 500-15700
Page 6 Rev. C, 04/11
The duress input can be used. A signal must be made available which
closes when the door opens. During the day the time clock relay
blocks this closure with open contacts. At night, the time clock relay
contacts close and any time the door is opened, the DPA goes into
immediate duress alarm mode. This does require the bypass input to
clear the alarm condition as is described in section 6.
An alternate technique can be employed for installations where both
lock status and door status signals are being input to the DPA. At
night, the time clock relay closes across the lock status input keeping
it reporting secure. Any time the door opens, the board immediately
reads the forbidden condition and goes into instant alarm. Recovery is by reclosing the door and
sending a reset input to the DPA. We prefer the use of the duress input as using the forbidden
condition technique reduces the security of the door. If, for example, the lock failed to engage,
this would not be reported as the time clock shunts this signal at night.
9. COMPLETE WIRING EXAMPLE
Figure 2, on the next page, provides one example of complete wiring for a DPA board. Because
of the unit's power and flexibility, many different wiring schemes are possible. Showing and
discussing one complete example, however, helps clarify use of the product.
In this application, we are using one of Securitron's "S" Sentat Magnalocks, which secures the
door. Note that we do not show the power and control connections for the Magnalock because
they have nothing to do with operation of the DPA. The DPA's role is only to monitor the secure
status of the Magnalock and this is done by simply connecting the lock's white wire to terminal
LS. This wire has +V on it when the lock is secure.
We also wish to detect any forbidden condition violation so we have added a door switch which is
closed when the door is closed. The switch common is powered by +V and the other side
connects to terminal IN. Reset is via a momentary normally open switch which connects into
terminal RS. For this application we want to occasionally disable the board, so we have an
alternate switch connected to terminal BP. We are not using duress so there is no connection to
terminal FE.
On the output side, we are showing the use of a Sonalert powered by relay #1 and an LED
powered by relay #2. This is exactly the way the unit is prewired when you buy the BA-DPA
version. If you have bought just the DPA version, you are free to use the same audio and visual
signals or create your own output reporting scheme. Relay #3 is typically employed for remote
monitoring into an alarm system or powering another remote light or sounder.
+
LS
BP
FE
IN
RS
DC
DOOR SWITCH
CLOSES WHEN
DOOR OPENS
TIME CLOCK RELAY
CLOSES AT NIGHT
FOR INSTANT ALARM