Manual
12
5.1.4 Detection of cable breaks with the help of two transmitters.
In the process of searching for a cable break with a transmitter, which is powered from the end of the
cable, the breaks cannot be tracked accurately when bad conditions prevail due to a field disturbance.
The impairments described above can be easily avoided if two transmitters (one on each end) are used to
detect the cable interruption. In this case, each transmitter is set to a different cable code, e.g.
Transmitter 1 to code F and Transmitter 2 to code C. (A second transmitter with a different cable code is
not included in the delivery and must be ordered separately.)
ATTENTION:
-
The circuit must not be live.
-
All unused cables must be connected to the auxiliary ground as shown in the following figure.
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Connect both transmitters according to the figure.
When the transmitters are connected in accordance with the figure, the receiver indicates
“C“ on the right
side of the cable break. If the receiver goes to the left over the break point, it shows
“F”. If you are directly
at the break point no cable code will be displayed because of the overlap of both transmitter signals.
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Set the transmission power in order to adapt it to different search radii.
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The target position can be located accurately by using the manual mode and adjusting the
sensitivity.
-
The transition resistance of a cable interruption must be higher than 100
kΩ
.
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The ground connected to the transmitter can be an auxiliary ground, the ground of a grounded
socket or a properly grounded water pipe.
-
Note when tracking the cable breaks in multicore cables, that all remaining wires in the shielded
cable or conductor must be grounded properly. This is required to avoid the cross coupling of the
supplied signals (through a capacitive effect on the output terminals). The tracking depth for
shielded cables and conductors is different, as the individual wires in the shielded cables are
looped around each other.
