BENDER ISOSCAN ® EDS460/490-EDS461/491 series

BENDER ISOSCAN ®  EDS460/490-EDS461/491 series

Product description

The insulation fault locators ISOSCAN® EDS460/490 in combination with the ISOMETER® IRDH575 or the locating current injector PGH are applied for localising insulation faults in unearthed systems (IT systems). The locating current signals generated by the insulation monitoring device IRDH575 or the locating current injector PGH are detected by measuring current transformers and evaluated by the insulation fault locators. Up to 12 measuring current transformers can be connected to one EDS460/490. A total of 90 EDS insulation fault locators can be connected via one RS-485 interface (BMS protocol). Hence, up to 1080 circuits can be monitored. The maximum scanning time is …10 s, see TGH1394.

Application

• Insulation fault location in AC, AC/DC and DC IT systems

• Main and control circuits in industrial plants and ships

• Diode-decoupled DC IT systems in power stations

• Systems for medical locations

Device features

• Insulation fault location in IT systems

• For AC, 3AC, DC and IT systems

• Control and display function in a single device (EDS…-D)

• 12 measuring channels (circuits) for measuring current transformers of the W, WR, WS series

• Up to 90 EDS insulation fault locators in the system (1080 measuring channels)

• Scanning time max. 10 s for all measuring channels (parallel scanning)

• Response sensitivity EDS460/490 2…10 mA, EDS461/491 0.2…1 mA

• History memory to store 300 events

• Two alarm relays with one changeover contact each

• N/O or N/C operation, selectable

• Connection external test/reset button

• Indication via graphical display resp.7-segment display and alarm LEDs

• BMS address range 1…90

• Serial interface RS-485

• Continuous CT connection monitoring

• Fault memory behaviour selectable

• Device version EDS490/491 with one alarm contactor per channel

• Additional AC residual current measurement

Function

Insulation fault location is started manually or automatically via the ISOMETER® IRDH575 or the PGH. Once started, the insulation fault locator EDS simultaneously scans all measuring current transformers (channels). If several EDS exist, these devices are also scanned simultaneously.

When the locating current detected by a measuring current transformer exceeds the set response value, the alarm LED 2 lights up, the common alarm relay switches and the faulty circuit is indicated as plain text on the graphical display. Version EDS…L indicates faulty outgoing circuits via alarm LEDs. The connection between the measuring current transformer and the insulation fault locator is continuously monitored. In the event of wire interruption, the alarm LED 1 lights up and the alarm relay switches.

With the fault memory activated, the alarm messages of the individual channels remains stored until the reset button is pressed or until a reset command is given via the RS-485 interface. When the fault memory is deactivated, the alarm message remains stored until the insulation fault is eliminated.

History memory in EDS460/461-D/EDS490/491-D

The device utilises a history memory for failsafe storing of up to 300 measured values/ events (date, time, channel, event code, measured value), so that all data about an outgoing circuit or an area can be traced back at any time (what happend when).

AC residual current measurement

EDS insulation fault locators can also be used for the indication of AC residual currents in unearthed power supplies (IT systems). This is essential when also AC residual currents are to be localised in the circuits.

Device variants

EDS460-D

Device version EDS460-DG features a backlit graphical display where information can be displayed in various ways. This version is applied when detailed information about all devices in the switchboard cabinet, connected to the bus, are to be displayed locally. This device is capable of assigning parameters to all devices connected to the BMS bus and displaying all measurement details. Several EDS460-DG devices can be used in one system.

EDS460-L

Device version EDS490D/EDS490L utilises a two-digit 7-segment display where the address of this device is displayed within the BMS bus. Various error codes are displayed too. The alarm LEDs indicate in which measuring channel the response value has been exceeded. Parameter setting is only possible via an EDS…D, an ISOMETER® IRDH575, the alarm and test combination MK2430 or the protocol converter COM460IP.

EDS490-D/EDS490-L

In comparison to the device version described before, EDS490-D/EDS490-L feature a galvanically isolated alarm contact (N/O contact), for example, to trigger a circuit breaker in this subcircuit when a response value has been exceeded.

EDS461-D/-L and EDS491-D/-L

In comparison to the device versions described above, these versions provide a higher response sensitivity. They are preferrably used in control circuits or in medical locations up to AC 230 (DC 220) V.

Core technical parameters

Measurement performance parameters | Parameter categories | EDS460/490 | EDS461/491 |

| Insulation fault location response value | 2... 10mA | 0.2... 1mA | AC residual current measurement range | 100mA... 10A | 10mA... 1A | | Number of channels (single device) | 12 (supporting W/WR/WS series measurement current transformers) | 12 (supporting dedicated high-sensitivity measurement current transformers) | | | Maximum number of networking devices | 90 (total 1080 measurement channels) | 90 (total 1080 measurement channels) | | Full channel scanning time | Approximately 8... 24 seconds | Approximately 14... 30 seconds | | Response delay (t_on)) | 0... 24s (adjustable) | 0... 24s (adjustable) | | Release delay (t_off) | 0... 24s (adjustable) | 0... 24s (adjustable)|

Environmental and Physical Parameters | Parameter Categories | Specific Specifications | 

| Operating Temperature | -25...+55 ℃ | | Climate Class (IEC 60721) | Fixed Use 3K5, Transport 2K3, Long Term Storage 1K4 (No Condensation, No Ice) | | Mechanical Class (IEC 60721) | Fixed Use 3M4, Transport 2M2, Long Term Storage 1M3 | Protection Class (Terminal) | IP20 (DIN EN 60529) | | Shell Material | Polycarbonate (UL94 V-0 Flame Retardant Class) | | Weight | EDS46x Series ≤ 360g | | Installation Method | Screw Installation (2 × M4) or DIN Rail Installation (Compliant with IEC 60715) The sentence is:|

Interface and networking parameters | Interface type | Specific specifications |

| Communication interface | RS-485, supporting BMS protocol | | Baud rate | 9.6kbit/s | | Maximum cable length | 1200m (exceeding DI-1DL repeater required) | | Recommended cable | Twisted pair J-Y (St) Y, minimum 2 × 0.8mm ², shielding layer connected to PE | | Terminal resistance | 120 Ω (0.25W), enabled through DIP switch | Device address range | 1... 90 (BMS bus address)|

Core functions and operational features

Measurement and positioning function

Insulation fault location: By measuring the current transformer to collect the positioning current generated by the PGH injector or IRDH575, when the current exceeds the set response value, the ALARM 2 indicator light is triggered to light up, the D-type equipment displays the fault channel plaintext, and the corresponding channel LED of the L-type equipment lights up.

Residual current measurement: Monitor the AC residual current in the IT system, and when it exceeds 10A (EDS460/490) or 1A (EDS461/491), trigger the ALARM 1 indicator light to turn on.

Channel connection monitoring: Continuously monitor and measure the connection status between the current transformer and the equipment, and trigger the ALARM 1 indicator light to light up when there is a disconnection or short circuit (this function can be disabled).

Storage and alarm function

Historical storage: The D-type device has a built-in historical memory that can store 300 event records, including date, time, channel, event code, measurement value, and supports traceability queries.

Fault memory: "Fault memory activation" (alarm information retained until manual reset or bus reset) or "Fault memory deactivation" (alarm information retained until fault elimination) can be selected.

Alarm relay: supports normally open (N/O) or normally closed (N/C) operation mode selection, and the common alarm relay can be linked to external alarm devices or control systems.

Operation and configuration features

Operation buttons: D-type devices include buttons such as INFO (information query), TEST (self-test), RESET (reset), MENU (menu), etc; L-shaped devices only include basic settings and reset buttons.

Parameter configuration: D-type devices can locally set bus addresses, response delays, fault memory modes, etc; L-type equipment needs to be configured through D-type equipment, IRDH575, MK2430 alarm test combination, or COM460IP protocol converter.

External control: Supports connecting external test/reset buttons (cable length 0... 10m), external buttons of multiple devices cannot be connected to each other.

Core components and accessories

Supporting measurement current transformer: BENDER dedicated measurement current transformer is required, and different models are compatible with different equipment series. The core models are as follows: | Equipment series | Recommended transformer types | Transformer structure | Inner diameter specification (mm) | Model example | Accessory code | | --------------; Rectangle: 70x175, etc; Opening and closing type: 20x30/50x80, etc. | W20 (circular 20mm) | B98080003 | | EDS461/491 | W/WS-8000 series | Circular/opening and closing type | Circular: 20/35/60; Opening and closing: 20x30/50x80 | W20-8000 (round 20mm) | B98080009|

Auxiliary Accessories | Accessory Type | Function Description | Model | Accessory Code |

| RS-485 Repeaters | Extended Bus Distance (over 1200m) or Number of Extended Devices (over 32 units) | DI-1DL | B95012047 | | USB Powered, No Additional Power Supply | DI-2USB | B95012045 | Protocol Converter | BMS Bus to TCP/IP (Ethernet) | COM460IP | B95061010 | | | BMS Bus to Modbus/RTU | FTC470XMB | B95061002 | | BMS Bus to PROFIBUS DP | FTC470XDP | B95061000 | | Power Adapter | Power Supply for Repeaters DI-1/DI-2 | AN471 B924189|

Power supply specifications and ordering information

Power supply voltage options: The device provides two power supply specifications, suitable for different industrial scenarios: | Power supply type | Specification parameters | Corresponding model suffix | 

Typical ordering code example:

EDS460-D-1: EDS460 series, D-type display, low voltage power supply, 2... 10mA sensitivity

EDS491-L-2: EDS491 series, L-shaped display, high voltage power supply, 0.2... 1mA sensitivity, independent alarm contacts per channel

Compliance standards

The equipment complies with multiple international and German industrial standards to ensure measurement accuracy and safety performance:

DIN EN 61557-8（VDE 0413-8）、EN 61557-8、IEC 61557-8

DIN EN 61557-9（VDE 0413-9）、IEC 61557-9

IEC 61326-2-4、DIN EN 60664-1（VDE 0110-1）、DIN EN 60664-3

ASTM F1669M-96 (2007)、ASTM F1207M-96 (2007)