Three-phase system insulation monitor ISOMETER® isoNAV685-D

medium-voltagefor AC networksAC/DC

Instantaneous tripping 150 ms Inverter disconnection Modbus TCP Tripping on shift voltage The ISOMETER® isoNAV685-D is an insulation monitoring device for IT systems in accordance with IEC 61557-8. It is applicable for use in 3(N)AC systems with nominal system frequency 60 Hz. Features 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 AMPPLUS and other profile-dependent measurement methods An adjustable response value for insulation monitoring in the range of 1 kΩ…10 MΩ (factory setting = 5 kΩ) and a response value of 150 V for the DC offset voltage 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 via the Internet or Intranet (Webserver/Option: COMTRAXX® gateway) Worldwide remote diagnosis via the Internet (made available by Bender Service only) BCOM, Modbus TCP and web server Applications AC/DC main circuits with directly connected DC components, such as rectifiers, converters, variable-speed drives Systems including switch-mode power supplies Systems including frequency inverters