Function
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IRDH575_D00089_05_M_XXEN/01.2020
3.3 Essential functions of the Insulation fault
location system (EDS)
Generation of the test current necessary for selective insulation fault
location
Indication of the insulation faults selectively localized by the EDS4…
systems
Parameterization of EDS4… systems
Test function for EDS4… systems, incl. the connected measuring cur-
rent transformers.
3.4 Product description
The IRDH575 ISOMETER® monitors the insulation resistance of IT systems. It is
suitable for universal use in 3NAC, AC/DC and DC systems. AC systems may in-
clude extensive DC supplied loads, such as converters or thyristor-controlled
DC drives. The device automatically adapts itself to the existing system leaka-
ge capacitance.
The IRDH575 ISOMETER® is fitted into an enclosure for panel mounting,
144 x 96 mm (WxH). For protection against dust and moisture, a panel seal
(IP42) or a front-face transparent cover (IP65) are available as accessories, see
page 112.
The IRDH575 can be used in combination with a control and indicating device,
PRC1470 version 2 or higher, for example, on the BMS (BMS = Bender Measu-
ring Device Interface) bus.
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