Pelco NET5308T-EXP manual Unsupervised Alarms

Figure 19 illustrates the wiring configuration for supervised alarm inputs.

NORMALLY CLOSED NORMALLY OPEN

10 K Ω

10 K Ω

Figure 19. Supervised Alarm Input Wiring

UNSUPERVISED ALARMS

When an alarm is configured as an unsupervised alarm, the NET5308T-EXP triggers an alarm only when the normal alarm state (open or closed) changes.

Figure 20 illustrates the alarm and no alarm conditions of an unsupervised alarm input. A normally closed alarm input can be defeated with a bypass. A normally open input can be defeated with a cut.

NORMALLY CLOSED			NORMALLY OPEN
NO ALARM		+V	NO ALARM	+V
GND			GND
ALARM		+V	ALARM	+V
GND			GND
ALARM		+V	NO ALARM	+V
GND			GND
NO ALARM	CUT	+V	ALARM	CUT
GND			GND	+V
	BYPASS		BYPASS

Figure 20. Unsupervised Alarm Conditions

Figure 21 illustrates the wiring configuration for unsupervised alarm inputs.

NORMALLY CLOSED NORMALLY OPEN

Figure 21. Unsupervised Alarm Input Wiring

ALARM CONNECTIONS

The unit includes two 8-pin alarm terminal blocks. These blocks have tension clamps. Use a small screwdriver to open the clamp for a particular lead. Figure 22 shows how to wire the alarm terminal block and connect it to the NET5308T-EXP.

When wiring the connector:

•Use 20 to 28 AWG (0.08 to 0.5 mm2) wire that is rated for 250 V or higher. The insulation must be thick enough to protect against electrostatic discharge (ESD).

•Strip the alarm wire to 0.31 inches (8 mm).

•Insert the wire far enough into the connector so that the metal is not exposed.

The terminal block is keyed. It attaches only one way to the NET5308T-EXP.

22 C2655M-A (10/08)