Insulation fault locator ISOSCAN® EDS441

Overview
The ISOSCAN® EDS441 insulation fault locators operate with the ISOMETER® iso685-D-P or the locating current injector PGH to detect and evaluate locating current signals in unearthed (IT) power systems. Each unit accepts up to 12 measuring current transformers (CTs). Via RS-485 (BS bus) up to 50 EDS units can be networked, enabling monitoring of up to 600 outgoing circuits.

Key features

• Automatic insulation fault location during operation
• 12 measuring channels for CTs
• CT connection monitoring and central fault indication
• Response sensitivity 0.2…1 mA; AC residual-current measurement with configurable threshold
• Two alarm relays (one N/O contact each), N/O or N/C selectable
• Modular, universal system concept; optional IOM441-S 12-relay extension
• Serial interface RS-485 (BS bus), Modbus RTU; address range 2…79

Applications

• Insulation fault location in AC, 3AC and DC IT systems
• Main and control circuits in industrial installations and ships
• DC IT systems with diode decoupling in power plants
• Power and control circuits in medical locations (with appropriate monitoring)

Variants (excerpt)
EDS441-S-1 | AC/DC 24…240 V | 0.2…1 mA | B91080204
EDS441W-S-1 | AC/DC 24…240 V | 0.2…1 mA | B91080204W
EDS441-L-4 | AC/DC 24…240 V | 0.2…1 mA | B91080205
EDS441W-L-4 | AC/DC 24…240 V | 0.2…1 mA | B91080205W

Optional accessories (excerpt)
DI-1PSM (RS-485 repeater) | AC/DC 24 V ±20% | B95012044
DI-2USB (RS-485/USB converter) | USB powered | B95012045
IOM441-S (12-relay I/O module) | - | B95012057

Measuring current transformers (examples)
CTAC20/1 | 20 mm | circular | B98110006
CTAC35/1 | 35 mm | circular | B98110008
CTAS50/01 | 50 mm | split-core | B98110012
CTAS80/01 | 80 mm | split-core | B98110013

Technical specifications

• Response sensitivity: 0.2…1 mA
• Up to 12 CTs per unit; system up to 50 EDS (RS-485) and 600 outgoing circuits
• Supply voltage (varies by variant): AC/DC 24…240 V
• Interfaces: RS-485 (BS bus), Modbus RTU; address range 2…79
• Two alarm relays; external test/reset input; CT connection monitoring