Function
2 Function
2.1 Intended use
The insulation fault locators ISOSCAN® EDS440 and EDS441 are used to locate insulation faults in unearthed
DC, AC and three-phase power supply systems (IT systems). Depending on the locating current injector, AC
and three-phase systems can be monitored within the range from AC 42 to 1000 V; DC systems, within the
range from DC 24 to 1500 V.
An AC residual current can be indicated in these ranges:
•
EDS440: 42…1000 Hz, 0.1…20 A
•
EDS441: 42…60 Hz, 0.1…2 A
An EDS system (insulation fault location system) consists of an EDS44x insulation fault locator and a locating
current injector. EDS44… insulation fault locators detect locating current signals generated by the locating
current injector via measuring current transformers and evaluate them accordingly.
Intended use also implies
•
the observation of all information in the operating manual and
•
compliance with test intervals.
In order to meet the requirements of the applicable standards, customised parameter settings must be made
on the equipment in order to adapt it to local equipment and operating conditions. Please heed the limits of
the range of application indicated in the technical data.
Do not make any unauthorised changes to the device. Only use spare parts and optional accessories sold or
recommended by the manufacturer.
The messages of the device must be perceptible even if it is installed in a control cabinet.
The devices is not designed for use in residential areas and may not provide sufficient protection for radio
reception there.
Any other use than that described in this manual is regarded as improper.
2.2 Features
2.2.1 Areas of application
•
Insulation fault location in AC, 3(N)AC and DC IT systems
•
Main circuits and control circuits in industrial plants and ships
•
Diode-decoupled DC IT systems in power plants
•
Systems for medical locations
2.2.2 Standards
The standard for unearthed power supplies (IT systems)
DIN VDE 0100-410 (VDE 0100- 410):2018-10 (IEC 60364-4-41:2005, modified + A1:2017, modified)
requires that the first insulation fault is to be eliminated with the shortest practicable delay. EDS systems
enable fast localisation of this insulation fault.
10 EDS44x_D00201_10_M_XXEN/11.2023
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