IRDH275-435 BENDER

IRDH275-435 BENDER Power module

Product  Description：

The IRDH275-435 is part of the IRDH series, specifically engineered to handle systems with high leakage capacitances, which are common in modern industrial environments with variable speed drives (VFDs) and electronic power converters. This device utilizes Bender's patented AMP Plus (Adaptive Measuring Pulse) measurement principle. This technology allows the device to distinguish between actual insulation faults and system-inherent leakage capacitance, ensuring high accuracy and preventing nuisance tripping even in electrically "noisy" environments. It features a local digital display and programmable alarm thresholds to alert operators to potential hazards.

Product Parameters

• System Type Compatibility: AC, AC/DC, and DC IT systems.

• Nominal System Voltage ($U_n$): AC $0–793 \text{ V}$, DC $0–650 \text{ V}$ (Can be extended with coupling devices).

• Supply Voltage ($U_s$): AC $88–264 \text{ V}$, DC $77–286 \text{ V}$.

• Response Value ($R_{an}$): Adjustable from $1 \text{ k}\Omega$ to $10 \text{ M}\Omega$.

• Measuring Principle: AMP Plus (Adaptive Measuring Pulse) for handling high system leakage capacitance.

• Max. System Leakage Capacitance ($C_e$): Up to $500 \mu\text{F}$ (with AMP Plus setting).

• Outputs: Two separate alarm relays (K1 and K2) with volt-free changeover contacts.

• Interfaces: RS-485 with BMS protocol for communication with other Bender devices or building management systems.

• Mounting: Standard $35 \text{ mm}$ DIN rail or screw mounting.

Product Advantages

A major advantage of the IRDH275-435 is its High Noise Immunity. In modern plants where VFDs create significant electrical interference, standard insulation monitors often fail; the IRDH275-435 filters this noise effectively. Its Universal Application capability means a single model can be used for both AC and DC systems, simplifying spare parts inventory.

The Predictive Maintenance aspect is another strength; by monitoring the insulation resistance in real-time and providing two separate alarm levels (Pre-warning and Main Alarm), it allows technicians to schedule repairs during planned downtime rather than reacting to an unexpected system failure. Furthermore, the Automatic Adaptation to system leakage capacitance ensures that the measurement remains precise even if the network configuration changes (e.g., adding or removing loads).

Important Considerations and Precautions

When installing the IRDH275-435, it is vital to ensure that only one insulation monitoring device is connected to a single galvanically connected IT system. Connecting multiple monitors will lead to measurement errors and mutual interference. The Selection of Coupling Devices is necessary if the system voltage exceeds the rated $793 \text{ VAC}$ or $650 \text{ VDC}$ to prevent permanent damage to the unit.

Proper Grounding Practices must be followed; the connection to the functional earth (PE) must be as short and low-impedance as possible to ensure accurate measurement pulses. Users should also be aware that during High-Voltage Testing (dielectric tests) of the plant, the IRDH275-435 must be disconnected from the system, as the high test voltages can destroy the internal measuring electronics. Lastly, the Alarm Relay Configuration (N/C or N/O operation) should be checked during commissioning to ensure it aligns with the plant's safety logic.

Product Applications

The Bender IRDH275-435 is essential in industries where power continuity is critical and "First Fault" tripping is unacceptable.

• Maritime and Shipping: Monitoring the unearthed power networks on ships and offshore platforms to prevent total blackouts.

• Mining and Tunnelling: Ensuring the safety of mobile machinery and power distribution in harsh, damp underground environments.

• Power Generation: Protecting the excitation systems of generators and the auxiliary power supplies in substations.

• Industrial Plants with VFDs: Monitoring large motor drives in paper mills, steel plants, and chemical processing facilities.

• Railway Systems: Ensuring the insulation integrity of signaling systems and DC traction power supplies.

The structure and details of the product：

Our services：

Shipping Port:  China

Payment: Bank of Chicago, Bank of Singapore

Express cooperation: fedex, DHL, UPS and your express account

Service: Professional Sales provides 24 hours /7 days online service

Warranty: one year

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JUSTWELL PTE. LTD

Our main products include DCS control system spare parts, PLC system spare parts, and robot system spare parts. Our advantageous brands include Allen Bradley, Bently Nevada, ABB, HIMA, Reliance, Bender, National Instruments, Emerson Ovation, Honeywell, Siemens, Allen Bradley, ICS Triplex, FOXBORO, Schneider, GE Fanuc, Motorola, HIMA, Prosoft, and other imported industrial components. Our main products serve a wide range of electronic, metallurgical, chemical, and power plants Industries such as steel mills, rubber, cement, machinery and equipment, and construction.