The iso685-D-B is a high‑performance insulation monitoring device from Bender, part of the iso685 series. It is designed for unearthed AC, 3(N)AC, AC/DC and DC systems (IT systems) and continuously monitors the insulation resistance of the main circuit. The device is particularly suitable for modern power systems that contain rectifiers, frequency converters, variable‑speed drives and other DC components. It complies with IEC 61557‑8 and is intended for rated system voltages of AC 0…690 V or DC 0…1000 V.
The “D” in the type designation indicates that the device is equipped with a high‑resolution graphic LC display and operating keys for direct parameter setting and status checking. The “B” stands for the integrated ISOnet function – an internal system disconnect relay that allows several ISOMETER® devices to coexist in coupled IT systems without interfering with each other, ensuring that only one device is actively measuring at any time.
Key Features & Functions
· High‑resolution graphic LC display – The display shows insulation resistance, system voltage, system frequency and leakage capacitance. On‑device configuration is done via the operating keys.
· ISOnet function – When several IT subsystems are interconnected by coupling switches, the integrated ISOnet function ensures that multiple ISOMETER® units can operate in the same IT system without mutual interference. Only one device actively measures; the others are in standby mode.
· Pre‑defined measuring profiles – Several pre‑configured measuring profiles are available (e.g. power circuit, control circuit, generator, high capacitance, frequency converter >10 Hz, frequency converter <10 Hz), allowing optimal adaptation of the measurement technique to the specific application.
· AMPPlus and AMP measuring methods – The device uses Bender‘s patented AMPPlus measurement technology, which automatically adapts to complex modern power system conditions including directly connected DC components and system leakage capacitance.
· Two independently adjustable alarm response values – Alarm values Alarm 1 and Alarm 2 can each be set independently from 1 kΩ … 10 MΩ. When the insulation resistance falls below a preset value, the alarm relays operate and the corresponding LEDs light up.
· History memory with real‑time clock – Built‑in fault memory with a real‑time clock (three‑day buffer) stores up to 1023 alarm messages with precise date and time stamp for easy fault tracing.
· isoGraph trend display – Graphical representation of the insulation resistance over time (isoGraph), supporting visualisation of trends per hour, day, week, month or year. Up to 100 measuring points can be stored, helping to detect gradual deterioration of insulation.
· Analogue output – Galvanically isolated current or voltage outputs (0(4)…20 mA, 0…400 µA, 0…10 V, 2…10 V) provide a signal proportional to the measured insulation value for connection to external instruments, PLCs or SCADA systems.
· Programmable digital inputs/outputs – Freely programmable digital I/O offer flexible control of the iso685 and fault reporting.
· Connection monitoring – Continuously monitors the connections of the measuring leads (L1/+, L2, L3/–) and earth (PE). Any disconnection or earth fault is signalled.
· RS‑485 communication interface – Electrically isolated RS‑485 interface supporting BMS (Bender measuring device bus), Modbus RTU and isoData protocols for data exchange with other Bender devices or central monitoring systems.
· Integrated web server and Modbus TCP – The built‑in web server and Modbus TCP interface allow all device parameters to be accessed via a standard web browser from a PC or mobile device, enabling remote setting and diagnostics.
· Automatic device self‑test – A continuous self‑test verifies the internal measuring circuits and connection status; a fault is signalled automatically.
· Automatic adaptation to system leakage capacitance – Automatically adapts to the existing system leakage capacitance (max. ≤ 1000 µF, depending on the selected measuring profile) and optimises the measuring time.
· Voltage extension via coupling devices – Using Bender AGH series coupling devices, the nominal system voltage range can be extended to higher levels, e.g. AC 0…1650 V or 3(N)AC 0…1300 V.
· De‑energised system monitoring – The device is powered by an independent supply (AC/DC 24…240 V) and can monitor the system even when the main circuit is de‑energised (off‑line monitoring).
· Wide operating temperature range – Operating temperature –25 °C … +55 °C, storage temperature –40 °C … +70 °C.
· DIN rail mounting – Mounting on a DIN rail according to IEC 60715; dimensions 108 × 93 × 110 mm, weight < 510 g.
Technical Specifications
· Nominal system voltage (Uₙ): AC / 3(N)AC 0…690 V; DC 0…1000 V
· Frequency range (fₙ): DC, 0.1…460 Hz
· Supply voltage (Uₛ): AC/DC 24…240 V (tolerance –30 % / +15 %), 50…400 Hz
· Response value range (Rₐₙ₁ / Rₐₙ₂): 1 kΩ … 10 MΩ, independently adjustable
· Maximum permissible system leakage capacitance (Cₑ): ≤ 1000 µF (depends on selected measuring profile)
· Measuring principle: AMPPlus and AMP (patented adaptive measuring pulse method)
· Display: High‑resolution graphic LC display with operating keys
· Alarm relays: Two independent changeover contacts (Alarm 1 and Alarm 2), configurable for N/O or N/C operation
· Analogue outputs: Current outputs 0(4)…20 mA / 0…400 µA; voltage outputs 0…10 V / 2…10 V (galvanically isolated)
· Digital I/O: Freely programmable digital inputs and outputs
· Fault memory: Built‑in storage with real‑time clock (three‑day buffer); stores up to 1023 date‑ and time‑stamped alarm messages
· Communication interface 1: RS‑485 (electrically isolated), supports BMS / Modbus RTU / isoData
· Communication interface 2: Ethernet port, supports Modbus TCP / web server (HTTP) / BCOM
· Connection monitoring: Yes (L1/+, L2, L3/– and PE)
· Self‑test: Automatic device self‑test with automatic fault signalling
· Measuring accuracy: typically ±15 % ±1 kΩ (1 kΩ…1 MΩ)
· Operating temperature: –25 °C … +55 °C
· Storage temperature: –40 °C … +70 °C
· Protection class: Terminals IP20, internal components IP40
· Mounting: DIN rail according to IEC 60715
· Dimensions (W × H × D): 108 × 93 × 110 mm
· Weight: < 510 g
· Standards compliance: IEC 61557‑8, DIN EN 61557‑8, EN 61010‑1, EN 61326‑2‑4, EN 61557‑1, EN 61557‑9, EN IEC 63000
· Order number: B91067010
Typical Applications
· Industrial IT systems – Insulation monitoring of AC, DC and mixed AC/DC unearthed systems containing rectifiers, frequency converters, variable‑speed drives and other DC components.
· Coupled IT systems – Installations where several IT subsystems are interconnected via coupling switches and require co‑ordinated operation of multiple ISOMETER® devices (using the ISOnet function).
· UPS systems and battery systems – Continuous monitoring of insulation integrity in uninterruptible power supplies and battery backup installations.
· Photovoltaic and renewable energy systems – IT systems with high leakage capacitance, e.g. solar PV arrays and wind power systems.
· Phase‑controlled heating systems – Monitoring insulation resistance in systems using phase‑angle control for heating elements.
· Switch‑mode power supply (SMPS) installations – Systems with high‑frequency switched power supplies.
· Extended‑voltage applications – Using AGH series coupling devices, the device can be used in higher‑voltage IT systems (e.g. AC 0…1650 V).
· Remote monitoring applications – Where the integrated web server and Modbus TCP interface are used for remote parameter setting, data logging and diagnostics.
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