2000 SERIES SENSORS INSTALLATION GUIDE Revision 3.1 June 1997
2.5 FIRE MONITORING CONTROLLERS
2.5.1 Zone Monitoring Unit IU2051
GENERAL DESCRIPTION
The IU2051 can be used to connect conventional detectors, fire beams, etc. on the
analogue loop. It is important to note that the total current load of the conventional loop
must not exceed 3.5 mA. This is typically 30 detectors.
The PCB has to be put in a housing, according to environmental conditions.
INDICATORS
Yellow LED
:
Indicates an open circuit or short on the two-wire
conventional loop.
Ind +/- connectors
:
An extra LED can be connected to indicate a Fire Alarm
condition on the conventional loop.
ADDRESS SETTING
Please refer to paragraph 2.2.3.
TECHNICAL DATA
Operating voltage: ......................................20-28V at the communication loop terminals
Total standby current: .................................<7.5mA, 4.5mA typical (no conventional
detectors connected) at the communication
loop terminals
Maximum alarm current: .............................< 60 mA at communication loop
Maximum no. of conventional detectors: ....30. Do not exceed 3.5 mA + EOL load current
Maximum capacitance: ...............................1 µF
Maximum line length: ..................................not to exceed 2km or not greater than
100 Ohms
End-of-Line resistor value:..........................10 k ± 5%, 1/4 W
Supply Voltage conventional loop:..............17 - 25 V DC
Zone impedances @ 24V: Short circuit:.....< 120 Ohms
Fire: .................120 - 1 K
Quiescent: .......1K - 26 K
Open circuit: ....> 26 K
