3. Function
3.1 Features
3.1.1 Features ISOMETER®
• ISOMETER® for IT AC systems with galvanically connected rectifiers or inverters and
for IT DC systems (IT = unearthed systems)
• Automatic adaptation to the existing system leakage capacitance
• Combination of
and other profile-specific measurement methods
• Two separately adjustable response value ranges of 1 kΩ…10 MΩ for alarm 1 and
alarm 2
• High-resolution graphic LC display for excellent readability and recording of the
device status
• Connection monitoring (monitoring of the measuring lines)
• Automatic device self test
• Graphical representation of the insulation resistance over time (isoGraph)
• History memory with real-time clock (buffer for three days) for storing 1023 alarm
messages with date and time
• Current or voltage output 0(4)…20 mA, 0…400 µA, 0…10 V, 2…10 V (galvanically
separated), which is analogous to the measured insulation value of the system
• Freely programmable digital inputs and outputs
• Remote setting of certain parameters via the Internet
(Option; COMTRAXX® gateway)
• Worldwide remote diagnosis via the Internet (made available by Bender Service
only)
• RS-485/BS (Bender sensor bus) for communication with other Bender devices
• ISOnet: Internal separation of the ISOMETER® from the IT system to be monitored
(e.g. if several IT systems are interconnected)
• BCOM, Modbus TCP and web server
• Locating current injection for selective insulation fault location
• Indication of the insulation faults selectively located by the EDS system
• Parameter setting of EDS systems
• Customer-specific texts for each measuring channel
*
3.1.2 Features EDS44…
• Insulation fault location in AC, 3AC and DC IT systems
(AC 24…690 V, DC 24…500 V)
• Up to 12 measuring current transformers of the W…, WR…, WS… measuring cur-
rent transformer series can be connected
• Response sensitivity insulation fault location:
EDS440 2…10 mA
EDS441 0.2…1 mA
• Response sensitivity residual current measurement:
EDS440 100 mA…10 A
EDS441 100 mA…1 A
• Communication of the components via BS bus (RS-485) or BB bus
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