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The digital unit is in Monitoring mode. It creates a discontinuity in the cabled circuit in order to check
the correct operation of the digital unit.
Disconnect the start of a sense cable in order to create a bus discontinuity on this cable.
The indicator light turns red and a discontinuity message appears on the digital unit. If a dry contact is
associated with this fault, it switches. The digital unit locates the faulty cable.
Reconnect the sense cable. An end of fault message appears, the indicator light turns green, the dry
contact switches back to its initial position and the digital unit switches to Monitoring mode.
4. DRAWING WITH FG-MAP
The map is a diagrammatic representation of the architecture of the system, for the detection and
localization of leaks from any of the sense cables installed. It indicates the layout of the sense cables,
neutral cables, diversion boxes and termination blocks.
The use of the drawings is essential for a good explanation of the system for detection, since they
make it possible to locate effectively and quickly the fault information indicated by the digital unit.
The Laminated drawings are coloured to identify the various cables (detection or neutral), the
accessories and the points there has been a simulation of a leak. Two specimens will be provided to
you indicating the zones for detection. When several zones are installed on the same level, it is
recommended to contemplate a plan of the level. A general drawing can also be carried out to clearly
identify the protected zones.
Drawing:
The drawing identifies a series of simulated leaks; the localization of these leaks is displayed on the
FG-SYS Digital Unit. Make a simulation at the remote end of all the sense cables on the circuit.
Precisely note the localization given by the digital unit displayed on the LCD Digital Unit. It is easier to
carry out these simulations with a suitable tool of communication (transmitting - receiver). Simulations
concerning leaks must be carried out one after the other in a chronological direction. At the end of the
simulations, check if the statements of points are in order with your installation. You can then carry out
the drawings, using these statements of points.
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