The 300 series Zone Display Unit is a transparent module directly connected to the Control Panel and requires no external power supply. The ZDU works with all of the 300 series detectors. When a detector goes into Alarm the ZDU responds to the current absorped by disconnecting the line to the Control Panel. The ZDU behaves like a detector in Alarm so that the Control Panel continues to warn of the Alarm and communicates with the detectors in order to obtain the addresses of those detectors in Alarm.

-

MINIMUM NOMINAL MAXIMUM UNITS COMMENTS Supply voltage 15 24 31 VDC Standby current --- 80 100 mA Does not include detector current Series resistor 270 330 680 W External series resistor value has to be added to the internal one (if present). Output impedance --- --- 1 W Does not include series resistor Reset time --- --- 0.3 S Alarm condition Reset time --- --- 1 S Normal condition (@24V, isolated line) Mechanical Specifications MINIMUM NOMINAL MAXIMUM UNITS COMMENTS Height --- --- 40 mm Length --- --- 132 mm Diameter --- --- 137 mm Weight --- --- 170 g Cable entry area --- --- 750 mm² Circular knock out on the box back side