The Alarmline II Digital Location Control Unit is an optional dual-zone module for monitoring up to two AlarmLine Digital Linear Heat Detection Cable zones. The ADLCU-2 is used to locate the point of activation along a long sensor cable length once an alarm has triggered. If an overheat, or fire situation triggers either zone of the digital cable the unit automatically calculates and displays the distance along the cable, in feet and metres, to the alarm point.
The ADLCU does not monitor the status of the Alarmline II Digital sensor cable and will not indicate fault or alarm conditions; the status of the cable will be monitored by the monitored input of the main fire system.
The two zones can operate independently of each other or in interlock mode. A separate alarm and normally conducting fault output are provided for each zone. The unit is intended to be installed between the AlarmLine digital linear heat detection cable and a conventional or addressable fire alarm control panel. It has power, fault and alarm indicators, and free outputs for fault and alarm, corresponding to each zone. It may also be connected to an industrial process control system using the two-wire RS-485 Modbus RTU output.
Modbus communication
The unit includes a two-wire RS-485 Modbus output which can be enabled to output the status of each zone of the digital location control unit via Modbus RTU/ASCII protocol. In case of an alarm, the location (in distance along the cable) is also communicated via Modbus.
Modes of operation
1. Independent – This is when the unit is used as a two-zone system. When a fault or overheat condition occurs on an LHD zone, the corresponding fault or alarm output respectively is triggered. The two zones operate independently, and both sets of outputs should be connected to a fire alarm control panel.
2. Interlock – this mode is for applications that require a fail-safe guarantee that an alarm is only triggered when an overheat condition has been detected. This mode may also be known as coincidence detection. In this case, the same rated temperature LHD cable should be attached to both unit zones. The alarm output is only activated when both LHD cables trigger an alarm due to an overheat condition. If one LHD cable zone input registers an alarm but the second does not, the alarm output will not be activated.
Interconnecting cable
The unit supports interconnecting cable (leader cable) between the control unit and the linear heat detection cable. The interconnecting cable is used in applications where the control unit is not located in the detection zone. The interconnecting cable is then used to connect the control unit in one location, with the linear heat detection cable in the protected area. The interconnecting cable is available in 100m lengths, under the product code AAI-0100.
Technical Specifications
- 2 line LCD provides location information as well as configuration menu options
- 2 x internal push-button controls to allow menu access and configuration changes
- Maximum sensor cable length 2 X 3000m
- Supply voltage 12 to 36VDC
- Current consumption: <40mA
- Operating temperature: -20 to 50 Deg C (-4 – 122 Deg F). Indoor use
- Polycarbonate, Ingress rating: IP65
- Dimensions (mm): 180h x 120w x 60.5d
