Product Overview

The Pertronic NFD Decoder decodes information from an LTX16 LIP (Local Indication Port) or LTX8 LIP adapter for local indication of Fire and Defect states of connected SGDs. The indication is ‘global’ only – that is, any SGD reporting an alarm will activate the NFD Decoder fire relay and fire LED; and any SGD reporting a fault (or disconnected SGD) will de-energise the defect relay and illuminate the defect LED. On power-up, SGDs connected and communicating with the LTX16 or LTX8 are considered to be ‘online’ or present by the Decoder, and any subsequent alarms or faults from these SGDs will be indicated by the Decoder. SGDs not communicating with the LTX16 or LTX8 on power-up are assumed to be ‘off line’ or permanently disconnected, these channels being subsequently ignored by the Decoder. A defect condition is not indicated by the Decoder at power-up when SGDs are disconnected. If an SGD is subsequently added to the LTX, the Decoder must be re-powered in order to accept the new SGD. The defect relay is energised when no faults are present, and released in the event of a fault (or an SGD test/defect). The defect LED is flashed in the event of a fault condition. The fire relay is energised when an alarm (or an SGD test / alarm) is present on any on-line SGD. The fire LED is flashed in the event of an alarm condition. The fire and defect LEDs are illuminated continuously (instead of flashing) when the corresponding event has occurred if link Function 1 is inserted on the Decoder PCB. If communication with the LTX16 or LTX8 is lost for more than 10 seconds, the defect relay is released and the defect LED is illuminated. The Decoder is powered from a local supply and at the indicated voltage (12 or 24 Vdc).