Three-phase system insulation monitor ISOMETER® iso685-…-P series

for AC networksAC/DCDC

Overview
The ISOMETER® iso685-…-P is an insulation monitoring device for ungrounded (IT) systems in accordance with IEC 61557-8 and IEC 61557-9. Universally applicable in AC, 3(N)AC, AC/DC and DC systems; suitable where AC systems contain DC-fed components (rectifiers, inverters, variable-speed drives).

Key features

• Predefined measurement profiles (AMPPlus and profile-specific methods)
• Measurement of insulation resistance, voltage, capacitance and frequency
• Integrated web server and remote configuration
• Communications: Modbus TCP/RTU, BCOM, RS-485 (BS bus)
• History memory with real-time clock (buffer ~3 days) for up to 1023 alarm messages

Device variants

• iso685-D-P: Integrated high-resolution graphic LC display and local operating controls (cannot be combined with FP200).
• iso685W-D-P: As D variant with environmental option W for extended climatic/mechanical demands.
• iso685-S-P: No display or local controls; intended for use with FP200 front panel.
• iso685W-S-P: S variant with option W for harsh environments (used with FP200W).

Variant details

• D variants: direct operation via device front panel; graphical isoGraph trend display available.
• S variants: operated via FP200/FP200W front panel; suitable when remote panel mounting is required.
• Option W: extended temperature range and mechanical protection (examples: -40…+70°C, designations 3K23 / 3M12).

Selected functions

• Automatic adaptation to existing system leakage capacitance
• Two separately adjustable response ranges (Alarm 1 and Alarm 2): 1 kΩ…10 MΩ
• Connection monitoring and automatic self-test
• Analog outputs proportional to measured insulation (0(4)…20 mA, 0…400 μA, 0…10 V, 2…10 V galvanically separated)
• Freely programmable digital inputs/outputs and customer-specific channel texts

EDS44x — insulation fault locators (selected)

• Supports selective insulation fault location in AC, 3AC and DC IT systems
• Up to 12 measuring current transformers (CTAC, WR, WS series) connectable
• EDS440 locating sensitivity: 2…10 mA; EDS441 locating sensitivity: 0.2…1 mA
• Communication between components via BS (RS-485) or BB bus

Applications

• Main circuits AC, DC or AC/DC including circuits with directly connected DC components
• UPS and battery systems, systems with switch-mode power supplies
• Heaters with phase control, drives and converters
• IT installations with high leakage capacitance or requiring insulation fault location

Optional accessories (selected)

• Insulation fault locators: EDS440 / EDS441 variants and W/L versions for harsh conditions
• Relay modules (e.g. IOM441-S), terminal kits (screw or push-wire), enclosure accessories

Technical specifications (summary)

• Standards: IEC 61557-8, IEC 61557-9
• Nominal system voltage examples: AC 0…690 V; 1…460 Hz · DC 0…1000 V
• Supply voltage examples: AC 24…240 V; 50…400 Hz · DC 24…240 V
• Response ranges: 1 kΩ…10 MΩ (two separately adjustable ranges)
• Communications: BCOM, Modbus TCP/RTU, RS-485 (BS), integrated web server; optional COMTRAXX® gateway
• Memory: history memory for 1023 alarm messages with RTC (buffer ~3 days)
• Environmental option W: extended range and increased mechanical/climatic ratings