Operation
6
Tips for troubleshooting on the detector line
63
Building Technologies
008250_i_en_--
Fire Safety
2013-08-15
6.14.3
Explanation of ground fault measurement (for
FDUL221 variant 3 only)
Once you have started up the line, you can identify the ground fault resistance
between (+) and ground as well as (-) and ground using the 'Measurements' menu.
The table below shows three examples:
Ground fault measurement
display
Interpretation
Line ok
Fault at connection with low measured value for (-)
Fault at connection with low measured value for (+)
The line is ok if the value '
OK' is displayed with '(+)
' and '(-)
'.
If 'leak' or 'fault' is displayed, there is a ground fault at the connection with the
lower resistance value to ground. This resistance corresponds to the actual
ground fault resistance.
The resistance at the other connection (the higher value) cannot be interpreted
directly, as it is usually 100 k on account of the internal circuit.
A resistance to ground that exceeds 500 k can no longer be reliably detected.
If the line is measured manually using a multimeter, the line must be
disconnected from the FDUL221 line tester.