Bender EDS3090, Руководство пользователя

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61 EDS309x_D00012_03_M_XXEN/11.2014
8. Frequently Asked Questions

The ISOMETER® indicates an insulation fault but this fault cannot be located using the
EDS309…. What could cause this problem?
– Individual outgoing circuits in the IT system monitored may be earthed. Check all outgoing
circuits for unintentional earthing.
The N conductor for the transformer that supplies the IT system must also not be earthed.
– There may not be any locating current flowing. Check the earth connection on the locating
current injector PGH18…, IRDH575 for correct connection.
– The PE conductor may have been unintentionally included in the cables in the measuring
clamp or the measuring current transformer.

EDS195P displays the error message "No CT connected". What could cause this problem?
– A measuring clamp is not connected or it is faulty.
– A measuring clamp or a measuring current transformer of the incorrect type has been con-
nected to the EDS195P, see table on page 33.

In case of residual current measurement (I
Δ
n
) the harmonic H… does not appear in the stand-
ard display. What could cause this problem?
– The menu item "2. Settings/ 7. Harmonics:" is not activated.