The EDS490-L-2 is an insulation fault locator designed for unearthed systems (IT systems) to automatically locate insulation faults. It works together with an ISOMETER® insulation monitoring device (e.g., iso685-D-P): when the ISOMETER® detects an insulation fault and generates a locating current signal, the EDS490-L-2 detects this signal via measuring current transformers installed on each branch circuit, thereby precisely identifying the faulty circuit without interrupting the power supply.
This model is the L version, which has no built‑in display and uses LED indicators for status display. It features 12 measuring channels with independent alarm contacts per channel. The -2 suffix indicates a AC/DC 70…276 V wide‑range power supply.
Technical Specifications
· Order No.: B 9108 0012
· Supply voltage (Uₛ): AC/DC 70…276 V, AC 42…460 Hz
· Measuring channels: 12 channels/device
· Response sensitivity: 2…10 mA (adjustable)
· Scanning time: ≤ 10 s (all channels scanned in parallel, up to 1080 channels)
· Display: 7‑segment LED display
· Alarm outputs:
· 2 common alarm relays (each with 1 changeover contact)
· 12 independent channel alarm contacts (12 × 1 N/O contact)
· History memory: 300 event records with date and time stamp
· Communication interface: RS‑485, supports BMS protocol
· BMS address range: 1…90
· CT connection monitoring: Continuously monitors external current transformer connection status
· Fault memory: Selectable latching/non‑latching mode
· Operating principle: Relays configurable for N/O or N/C operation
· Mounting: DIN rail mounting
· Protection class: Internal components IP30, terminals IP20
Key Features
· 12 independent measuring channels: Connects 12 measuring current transformers per device, each channel with its own alarm contact for precise fault location
· Parallel scanning technology: All channels scanned simultaneously, complete detection in as little as 10 seconds
· Adjustable sensitivity: Response value adjustable from 2…10 mA to adapt to system leakage capacitance
· High scalability: Up to 90 EDS devices can be connected via the BMS bus, expanding to 1080 measuring channels
· History memory: Built‑in storage for 300 time‑stamped event records
· Continuous CT connection monitoring: Continuously monitors external current transformer connections; alarms immediately on wire break
· Fault memory: Selectable latching mode keeps alarm status until manual reset
· LED status display: 7‑segment LED display clearly indicates device operating status and fault information
Typical Applications
· Industrial IT systems: Insulation fault location in unearthed systems with frequency converters, rectifiers and other power electronic loads
· Medical locations: Insulation fault location in IT systems (isolated power systems) for operating theatres, ICUs, etc.
· Data centres: Ensuring reliable power supply for server racks and UPS systems, quickly locating earth faults
· Marine and offshore: Insulation fault location on shipboard power systems and offshore platform distribution systems
· Power plants: Insulation fault location in auxiliary systems and DC control systems
· Photovoltaic systems: Insulation fault location on the DC side of large‑scale PV plants
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