ISOSCAN® EDS440 and EDS441 Insulation fault locator to locate insulation faults in
ungrounded DC AC and three-phase power supplies
System properties
•Universal system design
•Modular design, therefore easily
adjustable to the given circumstances
•Measuring current transformers
available in various sizes and versions
•CT connection monitoring
•Twelve measuring channels for series
W…, WR…, WS… measuring current
transformers
•Optional extension by twelve relay
channels
•Fault memory behaviour selectable
•Up to 50 EDS insulation fault locators in
the system, 600 measuring channels
•Response sensitivity:
– EDS440…: 2… 0 mA
– EDS44 …: 0.2… mA
•AC residual current measurement with
configurable response value
•Two alarm relays with one n/o contact
each
•n/o or n/c operation selectable
•External test/reset button
•Central display of faulty outgoing
circuits
•Serial interface RS-485, BS bus address
range 2…79
•Connection to higher-level control and
visualisation systems possible.
Intended use
The insulation fault locators ISOSCAN® EDS440 and EDS44 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 000 V; DC systems, within the range from
DC 24 to 500 V.
An AC residual current can be indicated in these ranges:
•EDS440: 42… 000 Hz, 0. …20 A
•EDS44 : 42…60 Hz, 0. …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.
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
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.
2 EDS44x_D0020 _ _D_XXEN/ .2023
