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    DIGITAL LHD CONTROL MODULE

    Shield Digital LHD Control Module (LH-DCM) is designed to enhance the functionality of existing or new Digital LHD systems. The Module is intended to be installed between the Digital LHD cable and a conventional or addressable re alarm control panel.

    The LH-DCM simultaneously monitors two zones of Digital LHD cable (up to 3,000 metres per zone) for an alarm or fault condition. If an overheat or fire situation triggers either zone of the Digital LHD cable, the LH-DCM automatically calculates and displays the distance along the cable, in feet and metres, to the alarm point. The two zones can operate independently of each other or in interlock/coincidence detection mode to eliminate the possibility of false alarms.

    An RS-485 Modbus RTU output also allows direct connection into a PLC or other process control system.

    Shield Digital LHD Control Module (LH-DCM) is designed to enhance the functionality of existing or new Digital LHD systems. The Module is intended to be installed between the Digital LHD cable and a conventional or addressable re alarm control panel.

    The LH-DCM simultaneously monitors two zones of Digital LHD cable (up to 3,000 metres per zone) for an alarm or fault condition. If an overheat or fire situation triggers either zone of the Digital LHD cable, the LH-DCM automatically calculates and displays the distance along the cable, in feet and metres, to the alarm point. The two zones can operate independently of each other or in interlock/coincidence detection mode to eliminate the possibility of false alarms.

    An RS-485 Modbus RTU output also allows direct connection into a PLC or other process control system.

    Features

    • Advanced functionality for traditional Digital LHD systems.
    • Pinpoints exact location of an incident and responds immediately.
    • Simultaneous monitoring of up to two zones.
    • Power indicator, fault and alarm lights for each zone.
    • Volt-free outputs for fault and alarm, corresponding to each zone.
    • Can be connected to an industrial process control system using the two-wire RS485 Modbus RTU output.
    • Built-in sounder for audible annunciation.
    • Interlock/Coincidence detection eliminates the possibility of false alarms by requiring both LHD cables to trigger before transmitting an alarm.

    Specifications

    INPUTS*
    Max zone length 3000m
    Min zone length 1m
    End of line resistor 1k ohm (Included)
    Short circuit current 0.5mA
    Max voltage 5V
    Ground fault impedence 0 ohms
    OUTPUTS
    Communications 2 wire RS-485 Modbus RTU/ASCII
    Sounder 2.4kHz 92dBa@10cm Buzzer
    Alarm volt-free relay contacts
    Max voltage 30Vac or 42.4Vdc
    Max current 2A
    Max switching power 60W, 62.SV
    Fault 2 x optoisolated phototransistor output
    Max voltage 35Vdc
    Max current 80mA
    Max power dissipation 150mW
    * Upto two Class B zones of Shield Digital LHD Cable
    ** All circuit power limited if powered fom a power limited supply.
    MECHANICAL
    Dimensions (HxWxD) 180 x 120 x 60.5 mm
    Rating NEMA 4, 4X (IP65)
    Finish Light Gray with clear lid
    Display 2 line, 16 character backlit display showing zone status
    Terminal block spacing 5mm Rising Clamp
    Terminal block wire size 0.08mm² (28AWG) to 4mm² (11AWG)
    ELECTRICAL**
    Operating voltage (UL Tested) 14Vdc Min / 24Vdc
    Operating voltage 12Vdc Min / 24Vdc
    Nominal / 36Vdc Max
    Current cons. (Standby) <15mA Min / <7mA
    Nominal / <5mA Max
    Current cons. (Alarm) <40mA Min / <23mA
    Nominal / <15mA Max
    Terminal block rating 16A
    Supervised circuits Power, Input Zone 1 & Input Zone 2
    ENVIRONMENTAL
    Operating Temperature -20°C to +50°C

    Resources

    Download Catalogue
    Download Control Module
    Download Installation Manual