Insulation fault locator ISOSCAN® EDS440 series

Overview
The ISOSCAN® EDS440 insulation fault locator locates insulation faults in unearthed power supply systems (IT systems) when used with an ISOMETER® iso685-D-P or the locating current injector PGH. The unit evaluates locating-current signals via measuring current transformers (CTs). One EDS440 supports up to 12 CT inputs; up to 50 EDS440 devices can be networked via RS-485 (BS bus) to monitor up to 600 outgoing circuits.

Key features

• Automatic insulation fault location for in-service mains
• Application: main power circuits and control circuits
• 12 measuring channels for measuring current transformers
• CT connection monitoring to detect wiring faults
• Universal, modular system concept for flexible integration
• Optional extension by 12 relay channels (IOM441-S)
• Selectable fault memory behaviour
• Response sensitivity configurable, typically 2…10 mA (variant dependent)
• AC residual current measurement with configurable response value
• Two alarm relays (one N/O contact each), N/O or N/C selectable
• External test/reset input
• Centralised display of faulty outgoing circuits
• Serial interface RS-485 (BS bus), address range 2…79; Modbus RTU supported
• Connection to higher-level control and visualisation systems possible

Applications

• Insulation fault location in AC, 3AC and DC IT systems
• Main and control circuits in industrial plants and ships
• Diode-decoupled DC IT systems in power plants
• Electrical installations in medical locations

Variants
Type | Supply voltage U_S* | Response value | LED display | Option "W" | Art. no.
EDS440-S-1 | DC 24 V | 2…10 mA | -- | -- | B91080201
EDS440W-S-1 | DC 24 V | 2…10 mA | -- | ✓ | B91080201W
EDS440-L-4 | AC/DC 24…240 V | 2…10 mA | ✓ | -- | B91080202
EDS440W-L-4 | AC/DC 24…240 V | 2…10 mA | ✓ | ✓ | B91080202W
EDS440-LAF-4 | AC/DC 24…240 V | 10 mA (fixed) | ✓ | -- | B91080209

Optional accessories
Type | Supply voltage U_S | Art. no.
DI-1PSM (RS-485 repeater) | AC/DC 24 V ± 20 % | B95012044
DI-2USB (RS-485/USB interface converter, with USB cable) | Powered from USB | B95012045
IOM441-S (input/output module) | 12-fold relay module | B95012057

Measuring current transformers (examples)
Type | Internal diameter / mm | Design type | Art. no.
CTAC20 | ø 20 | circular | B98110005
CTAC35 | ø 35 | circular | B98110007
CTAC60 | ø 60 | circular | B98110017
CTAC120 | ø 120 | circular | B98110019
CTAC210 | ø 210 | circular | B98110020
Alternative CTs (split-core, flexible, rectangular) also available with references

Technical specifications

• Inputs: up to 12 measuring current transformers per EDS440
• System scalability: up to 50 EDS devices via RS-485 (BS bus) → up to 600 outgoing circuits monitored
• Response sensitivity: configurable, typically 2…10 mA (variant dependent); LAF variant fixed at 10 mA
• Measurement: AC residual current measurement with configurable response value
• Relays: two alarm relays with one N/O contact each; N/O or N/C operation selectable
• Optional: extension by 12 relay channels (IOM441-S)
• CT connection monitoring included
• Serial interface: RS-485 (BS bus), Modbus RTU; address range 2…79
• Central display of faulty outgoing circuits; external test/reset input
• Supply variants: DC 24 V and AC/DC 24…240 V (depending on type)
• Modular design for integration into higher-level control and visualisation systems