BENDER IRDH575 Series Digital Ground Fault Monitor

Installation environment: Choose a location with good ventilation, away from heat sources and strong electromagnetic interference sources, and meet the requirements of working temperature (-10...+55 ℃) and protection level.

（2） Typical application configuration

1. Main circuit monitoring and positioning system (AC 20... 575V)

Configuration components: IRDH575B1-435+EDS460+W series current transformer+6A fuse.

Applicable scenarios: Factory three-phase main distribution circuit, with each EDS460 monitoring 12 main circuit branches and supporting cascading expansion of multiple EDS460 units.

Wiring method: L1/L2/L3/N passes through the current transformer, the IRDH575 host is connected to the system phase line and ground, and the EDS460 communicates with the host through the AB terminal.

2. Control circuit monitoring and positioning system (DC 20... 308V)

Configuration components: IRDH575B1-435+EDS461+8000 series current transformer+PLC.

Applicable scenarios: PLC control circuits, DC instrument circuits, EDS461 adapts to the high sensitivity requirements of control circuits and supports monitoring of grounding faults in PLC input and output circuits.

Wiring method: The control circuit wire passes through the current transformer, and IRDH575 and EDS461 communicate through the AB terminal. The analog output is connected to the PLC for centralized monitoring.

Model specifications and ordering information

（1） Core model differentiation

Model Monitoring System Voltage Range Applicable Scenarios Key Characteristics

IRDH575B1-435 AC 20... 575V, DC 20... 575V low voltage ungrounded system (industrial+civilian) basic type, covering the vast majority of industrial control and distribution systems

IRDH575B2-435 AC 340... 760V, DC 340... 575V high voltage ungrounded system (industrial specific) adapted to high voltage distribution circuits, allowing for higher external DC voltages

（2） Recommended supporting components

Component Name, Model, Function Description, Applicable Scenarios

The main circuit positioning device EDS460 monitors 12 AC main circuit branch factory main distribution and motor circuits

Control circuit positioning device EDS461 monitors 12 DC control circuit branches PLC control and instrument circuits

Portable positioning system EDS3090/EDS3091 mobile tracking fault source complex wiring, hidden fault troubleshooting

The W series current transformer is compatible with the AC main circuit and is compatible with EDS460

The 8000 series current transformer is compatible with DC control circuits and is compatible with EDS461

Protocol Converter - Convert to MODBUS/PROFIBUS for centralized monitoring of the upper system

Precautions and Maintenance Guidelines

（1） Precautions for use

Equipment installation and wiring must be operated by qualified electrical professionals, strictly following local electrical safety regulations and manual requirements.

It is strictly prohibited to modify the internal circuits or parameters of the equipment without authorization. The test current setting should match the circuit characteristics to avoid damage to the load caused by excessive current.

When wiring, it is necessary to distinguish between the monitoring system voltage and the power supply voltage to avoid permanent damage to the equipment caused by misconnection. The IT system power supply must be equipped with two fuses.

RS-485 communication cables require the use of shielded cables, with the shielding layer grounded at one end. Terminal resistors should be used for long-distance communication to reduce signal attenuation and interference.

（2） Key points of daily maintenance

Regular inspection: Check the status of the LED indicator lights, whether the wiring terminals are loose, and whether the grounding connection is reliable every month to ensure the normal operation of the equipment.

Functional testing: Long press the TEST button every quarter for self inspection to verify whether the alarm output and display system are normal, and at the same time check the response of alarm linkage devices (such as sound and light alarms, circuit breakers).

Data cleaning: After reaching 99 alarm history records, they need to be cleaned up in a timely manner to avoid affecting the storage of new data. They can be cleared through the RESET button or menu operation.

Fault handling: If an alarm occurs, first check the insulation resistance value and fault location through the LCD, and troubleshoot issues such as insulation damage and load leakage. After troubleshooting, press the RESET button to reset.