Operation
53
EDS460-490_D00085_01_M_XXEN/02.2016
12s EDS4.0: Four locating current pulses must be detected before an
alarm is triggered.
EDS4.1: Five locating current pulses must be detected before an
alarm is triggered.
Configurable values: 0s, 6s, 12s, 18s, 24s
4.Delay on release T(off)
This function is only effective when the fault memory is deactivated
(see "1.Memory" on page 50).
If the status that triggered the alarm no longer applies, the EDS… will termi-
nate its alarm once the delay on release has expired.
Configurable values: 0s, 6s, 12s, 18s, 24s
0s The alarm is terminated when the EDS4.0 has not recognised an in-
sulation fault for the duration of two locating current pulses.
The alarm is terminated when the EDS4.1 has not recognised an in-
sulation fault for the duration of three locating current pulses.
6s The alarm is terminated when the EDS4.0 has not recognised an in-
sulation fault for the duration of three locating current pulses.
The alarm is terminated when the EDS4.1 has not recognised an in-
sulation fault for the duration of four locating current pulses.
12s The alarm is terminated when the EDS4.0 has not recognised an in-
sulation fault for the duration of four locating current pulses.
The alarm is terminated when the EDS4.1 has not recognised an in-
sulation fault for the duration of five locating current pulses.
In the case of "DC" systems, "6 s" is preset. IRDH575/PGH…
sends alternate positive and negative locating current
pulses. However, in a DC system, locating current pulses
must either be all positive or all negative. As only every
second locating current pulse counts, the system must wait
for a further locating current pulse to be sent before it can
be certain that this measuring channel is free from
insulation faults.
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