BENDER IRDH575 Series Digital Ground Fault Monitor

BENDER IRDH575 Series Digital Ground Fault Monitor

Product Overview

（1） Product positioning and core applications

IRDH575 is an industrial grade digital grounding fault monitoring and positioning control device launched by BENDER in Germany. It is designed specifically for ungrounded (floating) AC/DC systems, with the core used to monitor the system's insulation resistance to ground, identify grounding fault risks in advance, and can be expanded into a precise grounding fault positioning system. It is suitable for complex industrial scenarios with power conversion equipment such as rectifiers and frequency converters, such as factory power distribution systems, PLC control systems, new energy equipment, etc. Through the dual functions of "fault detection+precise positioning", it ensures the electrical safety and continuous operation of ungrounded systems.

（2） Core Features and Compliance Standards

1. Core Features

Strong universality: Suitable for 3 (N) AC, AC/DC hybrid, pure DC ungrounded systems, with voltage coverage of 20-575V (low voltage type) and 340-760V (high voltage type).

Early warning: By measuring the insulation resistance (response range 1k Ω... 10M Ω), grounding faults can be detected before leakage current occurs, preventing potential problems.

Positioning Expansion: Paired with EDS4 series positioning devices, it can cover up to 1080 circuits and accurately locate fault branches and sources.

Comprehensive functions: It has multiple functions such as graded alarm, data storage, two-way communication, self-monitoring, etc., and is suitable for industrial centralized monitoring needs.

2. Compliance and Certification

Following standards: DIN EN 61557-8/9, IEC 61557-8/9, ASTM F1669M-96, IEC 60664-1 (Insulation Coordination), etc.

Environmental certification: RoHS certification, in compliance with environmental requirements.

Safety level: Flame retardant level UL94V-1, protection level IP30 (internal components)/IP40 (door mounted), suitable for harsh industrial environments.

Core functions and operational features

（1） Ground fault detection function

Insulation resistance monitoring:

Measurement principle: Inject weak test signals into the system through a built-in measurement circuit to monitor the insulation resistance of the system to ground, with a response range of 1k Ω... 10M Ω, supporting two-level independent alarm threshold settings (R_an1 warning, R_an2 main alarm), and can distinguish between "potential risks" and "serious faults" as needed.

Measurement accuracy: 10k Ω... 10M Ω range error 0%...+20%, 1k Ω... 10k Ω range error+2k Ω, measurement voltage ≤ 40V, measurement current ≤ 220 µ A (when Rf=0 Ω), will not affect the normal operation of the system.

Adaptation characteristics: Allow system leakage capacitance ≤ 150 (500) µ F, suitable for industrial systems with filtering capacitors, rated frequency range 50... 460Hz, supports low-frequency scenarios (<50Hz, reference characteristic curve).

Hierarchical alarm mechanism:

Alarm output: 3 switch contacts (SPDT), corresponding to warning (K1), main alarm (K2), system fault/EDS alarm (K3), supporting constant power on or off operation mode. Factory default K1/K2 is constant power off, K3 is constant power on.

Alarm mode: self-locking mode (manual reset after fault clearance), non self-locking mode (automatic reset after fault clearance), can be switched through menu settings.

Status indication: Alarm LED1 (warning), Alarm LED2 (main alarm), and system fault LED correspond to different alarm levels, providing visual feedback on the severity of the fault.

Self monitoring function:

Continuously monitor the grounding connection, line connection, and internal circuit status of the equipment itself. In case of abnormalities, trigger the K3 relay action and light up the system fault LED to avoid missed reporting due to equipment failure.

Support built-in/external test buttons (N/D contacts), long press the TEST button to activate self-test and verify whether the alarm circuit and display system are normal.

（2） Ground fault location function

System expansion configuration:

Core components: IRDH575 host+EDS460 (main circuit positioning)/EDS461 (control circuit positioning)+dedicated current transformers (W series/8000 series), optional EDS30... portable positioning system.

Scalability: Supports up to 90 EDS4 series devices for interconnection, with each EDS device capable of monitoring 12 circuits, covering a total of 1080 circuits, suitable for large-scale industrial power distribution systems.

Positioning workflow:

Trigger method: Automatically activate the positioning system upon detecting a ground fault, or manually activate the positioning function.

Signal transmission: IRDH575 sends pulse test signals (pulse/interval=2s/4s), with adjustable test current (≤ 1/2.5/10/25/50mA), suitable for different circuit impedance characteristics.

Fault identification: The signal is returned to the host through the fault circuit, and the LCD synchronously displays the fault EDS device address, circuit number, and signal strength (mA/µ A). The EDS device also synchronously indicates the fault channel locally.