Three-phase system insulation monitor ISOMETER® isoNAV685-D series

for AC networksAC/DCDC

Overview
The ISOMETER® isoNAV685-D is an insulation monitoring device for IT (unearthed) power systems in accordance with IEC 61557-8. It is designed for 3(N)AC systems with nominal frequency 60 Hz and for IT DC systems; it supports galvanically connected rectifiers and inverters and systems with directly connected DC components such as rectifiers, converters and variable-speed drives.

Key features

• Instantaneous tripping: 150 ms
• Inverter disconnection and tripping on DC offset voltage
• Automatic adaptation to system leakage capacitance
• Combination of AMPPLUS and other profile-dependent measurement methods
• Adjustable response range: 1 kΩ…10 MΩ (factory setting 5 kΩ)
• High-resolution graphic LC display with isoGraph for trend recording
• Connection monitoring of measuring lines and automatic self-test
• Analog outputs (galvanically separated): 0(4)…20 mA, 0…400 μA, 0…10 V, 2…10 V
• Freely programmable digital inputs/outputs and Modbus TCP / BCOM / integrated web server
• History memory with RTC (3-day buffer) storing up to 1023 alarm messages with date/time

Applications

• AC/DC main circuits with directly connected DC components (rectifiers, converters, variable-speed drives)
• Systems with switch-mode power supplies
• Systems with frequency inverters

Variants
Type | Nominal system voltage U_n | Supply voltage U_S | Art. No.
isoNAV685-D | AC 0…690 V; 1…460 Hz / DC 0…1000 V | AC 24…240 V; 50…400 Hz / DC 24…240 V | B91067014

Optional accessories

• Set of screw terminals — B91067901 (included where indicated)
• Set of push-wire terminals — B91067902
• Enclosure accessories (terminal cover, 2 mounting clips) — B91067903 (included where indicated)

Downloads

• CE Declarations of conformity
• Product brochures
• Quickstarts and manuals
• Datasheets
• Certificates and UKCA declarations

Technical specifications

• Standard: IEC 61557-8 (insulation monitoring for IT systems)
• Applicable system types: IT AC (3(N)AC) and IT DC systems; supports galvanically connected rectifiers/inverters
• Nominal system frequency: 60 Hz (applicable)
• Nominal system voltage range: AC 0…690 V; DC 0…1000 V
• Supply voltage: AC 24…240 V; 50…400 Hz or DC 24…240 V
• Response value range: adjustable 1 kΩ…10 MΩ (factory 5 kΩ); DC offset response value 150 V
• Instantaneous tripping time: 150 ms
• Measuring / analog outputs: 0(4)…20 mA, 0…400 μA, 0…10 V, 2…10 V (galvanically separated)
• Communication: Modbus TCP, BCOM, integrated web server; remote setting via Webserver (option: COMTRAXX® gateway)
• Display: High-resolution graphic LC with isoGraph
• History memory: RTC, buffer ~3 days, up to 1023 timestamped alarm messages
• Connection monitoring: measuring line supervision
• Programmable digital I/O and automatic device self-test
• Article number: B91067014