iso685-D-P_D00170_00_M_XXDE/06.2016
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Function
Only use the ISOMETER®:
• As intended
• In perfect working order
Immediately rectify any faults that may endanger safety. Do not make any unauthorised
changes and only purchase spare parts and optional accessories recommended by the
manufacturer of the devices. Failure to observe this requirement can result in fire, electric
shock and injury.
Unauthorised persons must not have access to or contact with the ISOMETER®.
Reference signs must always be clearly legible. Replace damaged or illegible signs imme-
diately.
2.4 Intended use
The ISOMETER® monitors the insulation resistance of unearthed AC/DC main circuits (IT
systems) with mains voltages of AC 0…690 V or DC 0…1000 V.
DC components existing in AC/DC systems do not influence the operating characteristics.
A separate supply voltage allows de-energised systems to be monitored too. The maxi-
mum permissible system leakage capacitance is 0…1000 µF, depending on the profile.
In combination with an insulation fault locator (EDS), the ISOMETER® can be used for in-
sulation fault location. By means of measuring current transformers, the EDS detects the
locating current pulses generated by the ISOMETER® in unearthed DC, AC and three-
phase power supplies (IT systems) and evaluates them.
Intended use also implies:
• The observation of all information in the operating manual
• Compliance with test intervals
In order to meet the requirements of applicable standards, customised parameter set-
tings must be made on the equipment in order to adapt it to local equipment and oper-
ating conditions. Please heed the limits of the area of application indicated in the
technical specifications.
Any other use than that described in this manual is regarded as improper.
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
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