BENDER IRDH575 Series Digital Ground Fault Monitor

Product Overview

Product Name: IRDH575 Digital Ground Fault Monitor/Ground Fault Localization System Controller

Applicable systems: ungrounded (floating) AC/DC systems, including 3 (N) AC, AC/DC hybrid, pure DC systems, suitable for industrial scenarios with power conversion equipment such as rectifiers and frequency converters

Core value: By monitoring the insulation resistance of the system to ground, ground faults can be detected in advance (can be identified when there is no leakage current), which can be expanded into a ground fault location system to accurately locate the fault circuit and ensure the electrical safety of ungrounded systems

Core functions and features

（1） Fault detection and alarm

Insulation resistance monitoring: The core determines faults by measuring the insulation resistance of the system to the ground, with a response range of 1k Ω… 10M Ω. It supports two-level adjustable alarm thresholds (R_an1 warning, R_an2 main alarm) and can distinguish different risk levels.

Hierarchical alarm mechanism:

Dual independent alarm relays (K1, K2), supporting constant power on or constant power-off operation mode, default constant power-off at the factory.

Alarm mode: self-locking mode (manual reset required after fault clearance), non self-locking mode (automatic reset after fault clearance).

Self monitoring function: Continuously monitor the status of the device’s grounding connection and line connection, trigger the system fault alarm relay (K3) in case of abnormalities, and support EDS positioning device alarm linkage.

（2） Grounding fault location

Scalability: Equipped with positioning devices such as EDS460 (main circuit), EDS461 (control circuit), and dedicated current transformers, it can be expanded into a ground fault positioning system, supporting up to 90 EDS4 devices for interconnection. Each EDS device monitors 12 circuits, covering a total of 1080 circuits.

Positioning principle: After detecting a ground fault, IRDH575 sends a pulse test signal (pulse/interval=2s/4s), which returns to the host through the fault circuit. The fault EDS address, circuit number, and signal strength are synchronously displayed on the LCD and EDS equipment.

Portable extension: optional EDS30… portable positioning system, tracks pulse signals to the source of faults, suitable for mobile troubleshooting scenarios.

（3） Data Storage and Communication

Data recording: Non volatile memory can store 99 alarm messages with timestamps, facilitating fault tracing and analysis.

Communication interface:

RS-485 interface (BMS protocol), supports bidirectional communication between devices, can be connected to Bendel protocol converters, and is compatible with Ethernet, MODBUS, PROFIBUS and other protocols.

0/4… 20mA analog output (load ≤ 500 Ω), can be connected to upper control systems such as PLC and DCS to achieve centralized monitoring.

Operation and Display:

Display: Backlit LCD screen (4 × 16 characters, character height 5mm), real-time display of insulation resistance (1k Ω… 10M Ω), system status, EDS equipment information, etc.

Operation: Equipped with INFO (parameter query), MENU (menu settings), ESC (return), TEST (test), RESET (reset) buttons, supporting internal/external test/reset buttons (remote operation).

Detailed technical parameters

（1） Electrical parameters

Category specific specifications

Monitoring system voltage IRDH575B1-435: AC 20… 575V, DC 20… 575V; IRDH575B2-435：AC 340…760V、DC 340…575V

Supply voltage AC 88… 264V (50… 460Hz), DC 77… 286V

Power consumption ≤ 14 VA

Insulation resistance measurement response range: 1k Ω… 10M Ω; measurement accuracy: 10k Ω… 10M Ω is 0%…+20%, 1k Ω… 10k Ω is+2k Ω

Measurement voltage (U_m) ≤ 40 V

Measure current (I2) ≤ 220 µ A (when R_F=0 Ω)

Allow system leakage capacitance (C_e) ≤ 150 (500) µ F

Alarm relay with 3 conversion contacts (K1/K2/K3), rated voltage AC 250V/DC 300V, connection capacity 5A, breaking capacity 2A (AC 230V, cos φ=0.4)

Analog output 0/4… 20mA, load ≤ 500 Ω

（2） Environmental and mechanical parameters

Category specific specifications

Working environment temperature -10 ℃…+55 ℃

Storage environment temperature -40 ℃…+70 ℃

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

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

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

Protection level: IP30 for internal components and IP20 for terminals (NEMA 1); IP40 (NEMA 1) for door installation

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

Plug in screw terminals for wiring terminals, supporting rigid conductors of 0.2… 4mm ² and flexible conductors of 0.2… 2.5mm ²

Weight ≤ 900 g

（3） Communication parameters

Category specific specifications

Interface type RS-485 (BMS protocol)

Maximum cable length of 1200 meters

Recommended shielded cable J-Y (ST) Y 2 × 0.6mm ² (shielding layer single ended PE)

Terminal resistance of 120 Ω (0.5W), controlled by micro switch S1

System configuration and installation

（1） Typical system composition

Number of component functions/adaptation

IRDH575 host fault detection, alarm control, positioning system management 1 unit/independent system

Up to 90 EDS460 main circuit grounding fault location devices, each with 12 circuits

EDS461 control circuit grounding fault location equipment (adapted to PLC input) up to 90 units, with 12 circuits per unit

Current transformer signal acquisition, compatible with main circuit/control circuit and EDS equipment

EDS30… Portable grounding fault location system optional for mobile troubleshooting

（2） Installation points

It is recommended to connect 6A fuses in series for the power supply circuit, and two fuses are required for IT system power supply.

When wiring, it is necessary to ensure reliable grounding of the equipment. The shielding layer of the RS-485 cable should be connected to PE at one end, and the terminal resistance should be enabled as needed (for long-distance communication).

The installation location should be far away from strong electromagnetic interference sources, ensure good ventilation, and meet the requirements of working temperature and protection level.

Ordering and Accessories

Core models: IRDH575B1-435 (low voltage range), IRDH575B2-435 (high voltage range)

Supporting equipment: EDS460 (main circuit positioning), EDS461 (control circuit positioning), EDS3090/3091 (portable positioning), dedicated current transformers (W series/8000 series)