Three-phase system insulation monitor ISOMETER® iso685-…-B

for AC networksAC/DCRS485

Overview
The ISOMETER® iso685-…-B is an insulation monitoring device for IT systems according to IEC 61557-8. Universally applicable in AC, 3(N)AC, AC/DC and DC systems, including AC systems with extensive DC-supplied loads such as rectifiers, inverters and variable-speed drives.

Key selling points

• Predefined measurement profiles for typical industrial and power applications
• Reliable measurement of insulation resistance, system voltage, capacitance and frequency
• Integrated web server for remote configuration and diagnostics
• Communication: BCOM, Modbus TCP/RTU, RS-485 / Bender sensor bus
• Suitable for coupled IT systems (ISOnet)
• History memory with isoGraph and time-stamped alarm log

Device variants

• iso685-D-B: with high-resolution graphic LC display and front operating controls for local operation; not combinable with FP200 for local control.
• iso685-S-B: without display or controls; to be used with FP200 front panel for operation.
• Option "W": versions with climate/mechanical reinforcement for extreme conditions (iso685W-D-B, iso685W-S-B).

Features

• Automatic adaptation to system leakage capacitance and combination of AMPPlus with profile-specific measurement methods
• Two separately adjustable response value ranges: 1 kΩ…10 MΩ
• Connection monitoring of measuring lines and automatic device self-test
• Graphical insulation-resistance trend (isoGraph) and history buffer (3 days) with 1023 alarm entries
• Analog outputs proportional to measured insulation value: 0(4)…20 mA, 0…400 μA, 0…10 V, 2…10 V (galvanically isolated)
• Freely programmable digital inputs/outputs and remote setting via webserver or COMTRAXX® gateway
• Worldwide remote diagnosis via Internet
• Voltage extension via coupling devices

Applications

• Main circuits AC, DC or AC/DC
• AC/DC circuits with directly connected DC components (rectifiers, converters, drives)
• UPS and battery systems
• Phase-controlled heaters and systems with switch-mode power supplies
• Coupled IT systems with high leakage capacitances

Variants table
Type | Nominal system voltage Un | Supply voltage US | Display | Option W | Art. No.
iso685-D-B | AC 0…690 V; 1…460 Hz / DC 0…1000 V | AC/DC 24…240 V | integrated | – | B91067020
iso685W-D-B | AC 0…690 V; 1…460 Hz / DC 0…1000 V | AC/DC 24…240 V | integrated | -40…+70°C, 3K23, 3M12 | B91067020W
iso685-S-B + FP200 | AC 0…690 V; 1…460 Hz / DC 0…1000 V | AC/DC 24…240 V | detached | – | B91067220
iso685W-S-B + FP200 | AC 0…690 V; 1…460 Hz / DC 0…1000 V | AC/DC 24…240 V | detached | -40…+70°C, 3K23, 3M12 | B91067220W

Optional accessories (excerpt)

• Coupling devices (several types available)
• Screw terminal and push-wire terminal sets
• Enclosure accessories (terminal cover, mounting clips)

Technical specifications

• Standard: IEC 61557-8 (insulation monitoring for IT systems)
• Applicable systems: AC, 3(N)AC, AC/DC and DC
• Nominal system voltage range: AC 0…690 V; 1…460 Hz / DC 0…1000 V
• Supply voltage: AC/DC 24…240 V (depending on variant)
• Response value ranges: 1 kΩ … 10 MΩ (two adjustable ranges)
• Measurement capabilities: insulation resistance, voltage, capacitance, frequency
• Analog outputs: 0(4)…20 mA, 0…400 μA, 0…10 V, 2…10 V (galvanically isolated)
• Communication: BCOM, Modbus TCP/RTU, RS-485 / Bender sensor bus, integrated web server
• History memory: buffer 3 days, up to 1023 alarm messages with date/time; isoGraph
• Environmental option W: -40…+70°C, protection classes 3K23, 3M12 (where applicable)