System Sensor PDRP-1002 Series - Manual (Page 37)

System Events 3. System Operation
PDRP-1002 Instruction Manual PN 51135:B0 04/06/01
37
Single Zone in Alarm (Cross Zone) Condition
Upon actuation of a single-zone initiating device, a red alarm LED will illuminate to indicate whether
Zone 1 or Zone 2 is in alarm.
In addition to the LED, a single-zone alarm will activate the Alarm Relay; the piezo and NAC #1 will start
sounding. In alarm condition, the piezo will generate a steady tone. The piezo can be silenced by pressing
the trouble silence switch. If the fire is extinguished before a second zone alarm is activated, return the
system to normal standby condition by pressing the reset switch inside the panel and holding it for three
(3) seconds.
Both Zones in Alarm (Cross Zone) Condition
When the first alarm occurs, the panel will function as described above.
Upon the occurrence of a second alarm, NAC #1 will de-energize. The second alarm LED will illuminate,
and NAC #2 will energize. At the same time, the predischarge timer will be activated. At the end of the
timer cycle the solenoid valve(s) will be energized to release the suppressant agent.
Manual Discharge Station Alarm Condition
Manual discharge does not use the predischarge timer. If a manual station is used to initiate the alarm
condition, the following will take place:
• NAC #2 and the piezzo will be activated. (In alarm condition, the piezo will generate a steady tone.)
• Alarm Relay will be activated.
• The solenoid valve(s) will activate.
Brownout Condition
The total power being provided to the system’s power supply should not exceed the current draw during
fully loaded panel operation. Brownout circuitry annunciates degradation of the incoming AC voltage
supply. A brownout condition is annunciated when the AC power decreases. When the brownout threshold
is reached, the system reacts as if AC power is totally lost:
• Battery backup begins supplying power to operate the control panel
• General Trouble Relay contact transfers
• Green AC Power LED turns off
• Yellow System Trouble LED illuminates
• The piezo will sound one second on, one second off, and repeat until the Trouble is cleared.
When the AC voltage returns or increases above the brownout threshold, the green AC Power LED will
illuminate. The power supply circuitry will return to primary power functions and begin to recharge the
backup battery supply.