BENDER ISOMETER ® IRDH575 Insulation Monitoring Equipment

BENDER ISOMETER ®  IRDH575 Insulation Monitoring Equipment

Product Overview

（1） Core positioning and applicable scenarios

Product Name: IRDH575 Insulation Monitoring Equipment (including fault location control function)

Applicable systems: Non grounded (IT) systems, including 3 (N) AC, AC-DC hybrid, and pure DC systems, with voltage coverage of two levels:

Low voltage type (B1 series): AC/DC 20... 575V

High voltage type (B2 series): AC/DC 340... 760V

Typical applications: Industrial scenarios with sensitive loads such as frequency converters, thyristor controlled DC drives, PLCs, etc., such as factory power distribution and automation control systems

Core value: By monitoring the insulation resistance of the system to ground in real-time, early warning of grounding faults can be given, and the expandable positioning function can accurately lock the fault circuit, ensuring the continuous operation of the IT system

（2） Compliance and Certification

Following standards: DIN EN 61557-8/9（VDE 0413-8/9）、IEC 61557-8/9、IEC 61326-2-4、ASTM F1669M-96  wait

Certification qualifications: CE, UL/US LISTED, flame retardant rating UL94 V-0, halogen-free design of the shell

Core functions and operational features

（1） Insulation monitoring function

Key specifications of specific parameters for functional items

Measurement range of 1k Ω... 10M Ω covers faults from low resistance to high resistance, identifying risks in advance

The alarm mechanism has two levels of independent alarms (K1 warning, K2 main alarm) and supports N/O (normally open)/N/C (normally closed) mode switching. The factory default is N/O

Measurement accuracy 10k Ω... 10M Ω: 0%...+20%; 1k Ω... 10k Ω:+2k Ω Measurement voltage ≤ 40V, measurement current ≤ 220 µ A, does not affect system operation

Self monitoring equipment fault alarm relay (K3) monitors its own grounding, line connections, and internal circuits, and triggers an alarm when abnormal

Test and Reset: Press and hold the TEST button for self-test, and press the RESET button to clear the alarm memory (supports self-locking/non self-locking modes)

（2） Ground fault location function

Extended Configuration

Core components: IRDH575 host+EDS460 (main circuit positioning)/EDS461 (control circuit positioning)+dedicated current transformer (W series/8000 series)

Scalability: Supports up to 90 EDS4 devices for interconnection, with each device monitoring 12 circuits, covering a total of 1080 circuits

Portable extension: optional EDS3090/EDS3091 portable locator to track the source of faults

Positioning principle and process

Trigger method: Automatic activation after fault or manual start

Signal characteristics: Generate adjustable positioning current (maximum 50mA), pulse period of 2s/interval of 4s, automatic current limiting in case of low resistance fault

Fault identification: The positioning current returns through the fault circuit, and the LCD synchronously displays the fault EDS address, circuit number, and signal strength (mA/µ A). The EDS device also provides local synchronous indication

（3） Data storage and communication functions

data recording

Storage capacity: 99 alarm records with date and time, including fault type, insulation resistance value, occurrence time, and will not be lost in case of power failure

Information inquiry: The INFO key quickly retrieves system leakage capacitance, device parameters, alarm history, etc

Communication interface | Interface type | Specification parameters | Applicable scenarios | | --- | --- | | RS-485 (BMS protocol) | Maximum cable length of 1200m, 120 Ω terminal resistance (S1 switch control) | Interconnected with Bender equipment, or adapted to MODBUS/PROFIBUS through protocol converter | Analog output | 0/4... 20mA optional, load ≤ 500 Ω | Connected to PLC, DCS and other upper level systems for centralized monitoring|

（4） Operation and display functions

Display system: Backlit 4 × 16 character LCD, supports pure text fault prompts, real-time display of insulation resistance (k Ω), EDS status, alarm information, etc

Operation buttons:

Function keys: INFO (information query), MENU (menu), ESC (return/confirm), TEST (self-test), RESET (reset)

Navigation keys: up/down arrows (parameter adjustment), Enter (confirm settings)

Status indication: EDS LED (positioning start), EDS alarm LED (fault location), Alarm LED1/2 (two-level alarm), equipment fault LED

Detailed technical parameters

（1） Electrical parameters

Category specific specifications

Monitoring system voltage B1 series: AC 20... 575V (50... 460Hz), DC 20... 575V; B2 series: AC 340... 760V, DC 340... 575V

The power supply voltage is AC 88... 264V (50... 460Hz), DC 77... 286V. 5A fuses are required for UL/CSA applications, and 6A is recommended for other scenarios

Allow system leakage capacitance ≤ 150 (500) µ F

Relay parameters: 3 conversion contacts (K1/K2/K3), rated voltage AC 250V/DC 300V, making capacity 5A, breaking capacity 2A (AC 230V, cos φ=0.4)

Power consumption ≤ 14 VA

（2） Environmental and mechanical parameters

Category specific specifications

Working environment temperature -10 ℃...+55 ℃ (cannot operate continuously in 50mA positioning mode)

Storage environment temperature -40 ℃...+70 ℃

Climate grade DIN IEC 60721-3-3 (3K5)

Impact resistance performance during operation: 15g/11ms; During transportation: 40g/6ms (IEC 60068-2-27/29)

Vibration resistance performance during operation: 1g/10... 150Hz; During transportation: 2g/10... 150Hz (IEC 60068-2-6)

Installation method: Panel installation, hole size 138 × 90mm, installation distance ≥ 30mm

Wire terminal screw terminal, supporting rigid conductor 0.2... 4mm ², flexible conductor 0.2... 2.5mm ² (AWG 24... 12)

Protection level: Internal components IP30, terminals IP20, door mounted IP40, optional IP42 (panel sealing)

Weight ≤ 900 g

System configuration and ordering information

（1） Typical system configuration

Key considerations for configuring components in application scenarios

The main circuit monitoring and positioning IRDH575B1-435+EDS460+W series current transformer IT system requires two fuses for power supply

Control circuit monitoring and positioning: IRDH575B1-435+EDS461+8000 series current transformers. It is recommended to set the positioning current to 1... 2.5mA to avoid interference with the PLC

（2） Model and accessories

Model Monitoring Voltage Order Number Special Characteristics

IRDH575B1-435 AC/DC 20... 575V B91065500 Standard Low Voltage Type

IRDH575B1-4227 AC/DC 20... 150V B91065505 measures a voltage of 10V and adapts to the control circuit

IRDH575B2-435 AC/DC 340... 760V B91065503 Standard High Voltage Type

IRDH575B2-427 AC/DC 340... 575V B91065506 High Voltage Control Circuit Type

Accessory Name Model Order Number Function

IP42 panel sealing - B98060006 enhances protection level to IP42

IP65 transparent cover - B98060007 dustproof and waterproof, suitable for harsh environments

DIN rail adapter - B98060010 supports DIN rail installation

External measuring instrument 9620-1421 B986841 remote display insulation resistance