User's Manual

DS720i Installation Guide
© 2000 Detection Systems, Inc. All rights reserved.
Page 5
6.5 Memory Operation
Memory, Armed Mode and Walk Test require a supply voltage on
Terminal 10 to activate these features. This supply voltage must be
between 6 and 18 VDC. You may use a switch as shown in Figure
9:
-
M
+
1 2 3 4 5 6 7 8 9 10
NC C
NO T T TR TR
Figure 9: Alarm Memory Function
Or use an external power supply as shown in Figure 10:
Control Panel
or
External DC
Supply
+
-
M
+
1 2 3 4 5 6 7 8 9 10
NC C
NO T T TR TR
-
Figure 10: Alarm Memory Function with External Power
Supply
Control voltage: +6 to +18 volts = ON (Switch Closed); 0 volts =
OFF (Switch Open).
Day Mode: The Day Mode disables the alarm memory and allows
the LED (if activated) to operate normally.
Memory: When the DS720i is in the Night Mode the memory is
activated. This allows the detector to store an alarm for display at a
later time.
Armed Mode: The Night Mode enables the alarm memory and
disables the LED operation.
Remote Walk Test (LED Control): When the DS720i is in the
Walk Test mode, the LED will indicate the current alarm status
regardless of the setting of the LED Operation switch (Switch 1).
Table 2: Memory Operation Settings
Desired Action Control Voltage (Terminal M)
Turn ON Night Mode/
Reset Stored Alarm
ON (for more than 20 seconds)
Turn OFF Night Mode/
Display Stored Alarm
OFF
Turn ON Walk Test (if OFF)
ON (for more than 5 seconds,
but less than 20 seconds)
Turn OFF Walk Test (if ON)
ON (for more than 1 second,
but less than 20 seconds)
7.0 Setup and Walk Tests
Place the LED switch in the ON position. If using the Memory Input
to enable the Remote Walk Test feature, it is not necessary to put
the LED switch in the ON position.
NOTE: Use a bubble level on the front of the unit to check for
proper positioning and alignment.
7.1 Establishing PIR Pattern Coverage
Turn the Microwave Range Adjust to minimum.
Replace the cover and snap it into place. This will close the tamper
switch.
During the warm-up period, the LED will flash red until
the unit has stabilized and has seen no movement for
2 seconds (approximately 1 to 2 minutes). When the
LED stops flashing, the detector is ready to be tested.
With no motion in the protection area, the LED should
be OFF. If the LED is ON, recheck the protection area
for disturbances affecting the microwave or PIR
technologies.
Walk test across the pattern at its farthest edge, then several times
closer to the detector. Start walking from outside of the intended
protection area, and observe the LED. The edge of the pattern is
determined by the first green, PIR activation of the LED (or the first
red activation if the yellow microwave LED activates first).
If the desired coverage cannot be achieved, try angling the
coverage pattern up or down to ensure the pattern is not aimed too
high or low. In a narrow aisleway, aiming the pattern slightly left or
right can also improve the detector's catch performance.
7.2 Establishing Microwave Coverage
Wait 1 minute after removing/replacing the cover so
the microwave portion of the detector can settle and to
wait at least 10 seconds between the following walk
testing procedures.
The LED should be OFF before walk testing.
Walk test across the pattern at the intended coverage's farthest
end. Start walking from outside the intended protection area and
observe the LED. The edge of the microwave pattern is determined
by the first activation of the yellow LED.
If an adequate range cannot be reached, increase the Microwave
Range Adjust slightly. Continue walk testing (waiting 1 minute after
removing/replacing the cover) and adjusting the range until the
farthest edge of desired coverage has been accurately placed.
Do not adjust the Microwave Range higher than
required. Doing so will enable the detector to catch
movement outside of the intended coverage pattern.
Walk test the unit from all directions to determine all the detection
pattern boundaries. Wait at least 10 seconds between walk tests.
7.3 Establishing Detector Coverage
All LEDs should be OFF before walk testing.
Walk test the unit from all directions to determine the detection
boundaries. A detector alarm is signaled by the first red activation
of the LED after an initial green or yellow LED activation.