Low voltage network insulation monitor ISOMETER® isoNAV685-D-B

AC/DCModbusfor switchgear

Overview
The ISOMETER® isoNAV685-D-B is an insulation monitoring device for offline monitoring of de-energised TN, TT or IT systems in accordance with IEC 61557-8. It provides measurement and trend recording of insulation resistance and supports remote access and network integration.

Key features

• Offline monitoring of de-energised loads and systems
• Monitors three insulation levels
• AMPPLUS measurement method with automatic adaptation to system leakage capacitance
• Adjustable response value 10 kΩ…1 MΩ (factory setting 50 kΩ)
• Reduced measuring voltage for increased safety
• High-resolution graphic LC display with isoGraph for trend visualisation
• History memory with real-time clock (buffer for three days) storing up to 1023 timestamped alarm messages
• Earth connection monitoring and automatic device self-test
• Freely programmable digital inputs and outputs
• Communication: Modbus TCP, BCOM, built-in web server; COMTRAXX® Gateway optional
• Remote setting and worldwide remote diagnosis via Internet/Intranet

Applications

• Monitoring of de-energised loads and networks in industrial electrical installations, switchgear and control panels

Variants
Type | Nominal system voltage range | Supply voltage | Art. No.
isoNAV685-D-B | offline | AC 24…240 V; 50…400 Hz / DC 24…240 V | B91067024

Optional accessories

• Set of screw terminals — Art. No. B91067901
• Set of push-wire terminals — Art. No. B91067902
• Enclosure accessories (terminal cover, 2 mounting clips) — Art. No. B91067903

Technical specifications

• Standard: IEC 61557-8 (insulation monitoring for IT systems)
• Application: de-energised TN, TT or IT systems
• Measurement method: AMPPLUS
• Response value adjustable: 10 kΩ … 1 MΩ (factory 50 kΩ)
• Display: High-resolution graphic LC display; isoGraph for trend representation
• History memory: up to 1023 alarm messages with date/time (3-day buffer)
• Digital I/Os: freely programmable
• Remote access: Web server; option COMTRAXX® Gateway; worldwide remote diagnosis
• Communication: BCOM, Modbus TCP
• Measuring voltage: reduced measuring voltage
• Supply voltage (example variant): AC 24…240 V; 50…400 Hz / DC 24…240 V
• Article number (example variant): B91067024