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EDS460-490_D00085_01_M_XXEN/02.2016
2. Safety instructions
2.1 Intended use
EDS… insulation fault locators are used for localisation of insulation faults in
unearthed DC, AC and three-phase power supply systems
(IT systems). Alternating and three-phase systems in the range of AC 24 to 690
V and DC systems in the range of DC 24 to 500 V can be monitored. The ope-
rating frequency is optionally DC, 50, 60 or 400 Hz. The nominal system volta-
ge varies with the type of locating current injector (PGH47., IRDH575).
An EDS system consists of the insulation fault locators EDS460/490 or EDS461/
491 and either the A-ISOMETER® IRDH575 or locating current injector PGH.
Using measuring current transformers, EDS460/490 or EDS461/491 insulation
fault locators detect locating current signals generated by the IRDH575 insu-
lation monitoring device or PGH… locating current injector and evaluate
them.
If the locating current is too high, IRDH575 or PGH… may
damage sensitive loads (e.g. in control circuits) or may
accidentally activate switching operations. Therefore, it is
recommended to use a PGH… with a low locating current
or to set a low locating current at the IRDH575. The
response sensitivity of EDS461/491 insulation fault locators
is higher and hence they are capable of evaluating this low
locating current.
In case of doubt, please contact a Bender product manager.
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