The iso685W-D is a high‑performance insulation monitoring device from Bender, part of the iso685 series, designed for unearthed AC, 3(N)AC, AC/DC and DC systems (IT systems) in accordance with IEC 61557‑8. AC systems may include rectifiers, inverters, variable‑speed drives and other DC loads.
The “D” version features a high‑resolution graphic LC display and operating keys for direct on‑device configuration. The “W” variant is specially hardened for extreme climatic and mechanical conditions.
Technical Specifications
· Rated system voltage (Uₙ): AC 0…690 V (1…460 Hz); DC 0…1000 V
· Supply voltage (Uₛ): AC 24…240 V (50…400 Hz); DC 24…240 V
· Response value range (Rₐₙ₁ / Rₐₙ₂): 1 kΩ … 10 MΩ, two independently adjustable thresholds
· Display: High‑resolution graphic LC display
· Alarm output: Two independent changeover contacts (K1, K2)
· Communication interfaces: RS‑485 (BMS / Modbus RTU / isoData), Ethernet (Modbus TCP / Web server / BCOM)
· Analogue outputs: Current or voltage outputs 0(4)…20 mA, 0…400 μA, 0…10 V, 2…10 V (galvanically isolated)
· Digital I/O: Freely programmable digital inputs and outputs
· History memory: Real‑time clock (3‑day buffer); stores up to 1023 alarm messages with date and time stamp
· Protection class: Internal components IP40, terminals IP20
· Mounting: DIN rail (IEC 60715)
· Dimensions (W × H × D): 108 × 93 × 110 mm
· Weight: < 390 g
W Version Enhanced Features
Compared to the standard iso685‑D, the W version offers:
· Increased shock and vibration resistance – compliant with mechanical class 3M12
· Conformal coating on electronic components for improved protection against moisture, salt spray and mechanical stress
· Extended operating temperature range: –40 °C … +70 °C
Key Features
· Insulation monitoring – continuously monitors insulation resistance of IT systems; alarm triggers when value falls below preset threshold
· AMPPlus measuring principle – automatically adapts to system leakage capacitance
· Two independently adjustable alarm thresholds – range 1 kΩ…10 MΩ for pre‑warning and main alarm
· isoGraph trend analysis – graphical display of insulation resistance over time
· History memory – stores 1023 time‑stamped alarm messages
· Connection monitoring – continuously supervises measuring leads
· Automatic self‑test – with automatic fault reporting
· Fault memory – selectable latching function
· Password protection – prevents unauthorised parameter changes
· Remote access – via integrated web server for remote configuration and diagnostics
Typical Applications
· Industrial IT systems
· AC/DC hybrid systems with rectifiers and inverters
· Marine and offshore installations
· Railway applications
· UPS and battery systems
· Photovoltaic and renewable energy systems
· Data centres and telecommunications
· Medical locations (operating theatres, ICUs)
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