The iso685-D-P is an insulation monitoring device from Bender, compliant with IEC 61557‑8 and IEC 61557‑9, designed for unearthed IT systems. It is a D variant equipped with a high‑resolution graphic LCD display and operating keys, allowing direct operation and parameter setting without the need for an FP200 front panel. The suffix -P indicates an integrated locating current injector function.
Technical Specifications
· Rated system voltage: AC 0…690 V, 1…460 Hz; DC 0…1000 V
· Supply voltage: AC 24…240 V, 50…400 Hz; DC 24…240 V
· Alarm response values: 1 kΩ … 10 MΩ (Alarm 1 / Alarm 2, two independently adjustable thresholds)
· Max. system leakage capacitance: ≤ 1000 μF (depending on the selected measuring profile)
· Operating temperature: –25 °C … +55 °C
· Mounting: DIN rail mounting
· Order number: B91067030
Key Features
· Integrated locating current injector – Built‑in locating current generator; together with EDS series insulation fault locators and measuring current transformers, forms a complete insulation fault location system
· D variant – Equipped with display and operating keys; no FP200 required
· AMPPlus measuring principle – Automatically adapts to system leakage capacitance and DC components
· Predefined measurement profiles – Power circuit, control circuit, generator, high capacitance, frequency converter, etc.
· Multi‑parameter measurement – Insulation resistance, true RMS voltage, frequency, leakage capacitance
· History memory – 1023 alarm messages with date/time stamp (real‑time clock, 3‑day buffer)
· Communication interfaces – RS‑485 (BMS/Modbus RTU), Ethernet (Modbus TCP, web server)
· ISOnet function – Supports internal isolation and coordinated operation of multiple devices in coupled IT systems
Typical Applications
· Industrial IT systems
· Medical locations
· UPS and battery systems
· Photovoltaic and renewable energy systems
· Data centres
· Marine and offshore applications
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