BENDER IRDH575 Series Digital Ground Fault Monitor

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

（3） Data storage and communication functions

Data recording and querying:

Non volatile memory can store 99 alarm messages with timestamps, including fault type, insulation resistance value, occurrence time, etc. Data will not be lost after power failure, making it easy to trace and analyze faults.

The INFO key can quickly query system leakage capacitance, device setting parameters, alarm history, and other information without entering deep menus.

Communication interface:

RS-485 interface (BMS protocol): Supports bidirectional communication between devices, with a maximum cable length of 1200m. It is recommended to use shielded cable J-Y (ST) Y 2 × 0.6mm ² (shielded layer single ended PE), equipped with a 120 Ω terminal resistor (controlled by micro switch S1).

Protocol extension: Can connect to Bendel protocol converters, adapt to industrial protocols such as Ethernet, MODBUS, PROFIBUS, etc., and achieve interconnection with upper level systems such as PLC and DCS.

Analog output: 0/4... 20mA optional, load ≤ 500 Ω, can convert insulation resistance signal into standard analog quantity, and connect to external instruments or centralized monitoring system.

（4） Operation and display functions

Display system:

Backlit LCD screen (4 × 16 characters, character height 5mm), supports multilingual display such as Chinese/English, real-time display of insulation resistance value (1k Ω... 10M Ω), system status, EDS device information, alarm history, etc.

Auxiliary display: The "s" symbol indicates that a new measurement is in progress, EDS mode display (AUTO/MANUAL/ON/OFF), test pulse polarity indication (Point=valid BMS communication, H=new historical record).

Operation buttons:

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

Navigation keys: up/down arrow keys (menu scrolling), Enter key (confirm settings).

External Expansion: Supports connecting external reset buttons (N/E contacts or jumpers), and the device can automatically reset when the terminal is open, suitable for remote operation scenarios.

Detailed technical parameters

（1） Electrical parameters

Category specific specifications

Monitoring system voltage IRDH575B1-435: AC 20... 575V (3 (N) AC/single-phase) DC 20…575V

IRDH575B2-435: AC 340... 760V (3 (N) AC/single-phase) DC 340…575V

The power supply voltage is AC 88... 264V (50... 460Hz), DC 77... 286V, and two 6A fuses are required for IT system power supply

Power consumption ≤ 14 VA

Insulation coordination rated insulation voltage AC 800V, rated impulse withstand voltage 8kV (pollution level 3)

Measure the internal DC resistance of the circuit to be ≥ 180k Ω, 50Hz impedance to be ≥ 180k Ω, and allow external DC voltage B1 ≤ 810V/B2 ≤ 1060V

Relay parameters: rated contact voltage AC 250V/DC 300V, connection capacity AC/DC 5A, breaking capacity 2 A（AC 230V，cosφ=0.4）、0.2A（DC 220V，L/R=0.04s）， Electrical lifespan of 12000 cycles

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, installation direction is display facing outward

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

Shell and weight flame retardant grade UL94V-1, weight ≤ 900g

（3） Communication and interface parameters

Category specific specifications

Communication interface RS-485/BMS protocol, supporting bidirectional data transmission

The cable requires shielded cable J-Y (ST) Y 2 × 0.6mm ², with the shielding layer connected to PE at one end

Maximum communication distance 1200m

Terminal resistance of 120 Ω (0.5W), controlled by micro switch S1 to enable/disable

External button test button (N/D contact), reset button (N/E contact or jumper)

Backup contact STANDBY contact, when closed, the device enters standby mode and stops sending measurement signals

System installation and typical configuration

（1） Installation points

Power supply configuration: The power supply circuit is connected in series with 6A fuses, and the IT system needs to be equipped with two fuses to ensure equipment overcurrent protection.

Grounding requirements: The equipment grounding terminal (KE) should be reliably grounded, and the RS-485 cable shielding layer should be single ended with PE to reduce electromagnetic interference.

Wiring specifications: Measurement circuits and power cables should be laid separately to avoid cross interference. The wiring between EDS equipment and current transformers should follow polarity requirements.