IRDH375B-427 Bender ISOMETER Insulation Monitoring Device

Description

IRDH375B-427 Bender ISOMETER Insulation Monitoring Device

Product Dimensions：

Product Description (Detailed Explanation)

The IRDH375B series utilizes Bender’s patented AMP Plus measurement principle. Unlike standard measurement methods, AMP Plus can accurately distinguish between actual insulation faults and the system’s natural leakage capacitance. This makes it highly effective in systems with large rectifiers, inverters, or DC components.

The specific -427 variant is configured for a specific supply voltage range (typically 19.2 to 72V DC). The device features a backlit LC display that provides a real-time numerical value of the insulation resistance in Ohms ($\Omega$), and it includes two independently adjustable alarm relays to signal pre-warnings and critical faults to a centralized control system or PLC.

Product Parameters (Technical Specifications)

Product Advantages (Key Benefits)

• Universal Monitoring: Capable of monitoring pure AC, pure DC, and mixed AC/DC systems, reducing the need for multiple different monitoring devices.

• AMP Plus Technology: Minimizes false alarms caused by high system leakage capacitances, which are common in modern industrial plants with extensive cabling or EMI filters.

• Real-Time Visualization: The built-in LC display allows maintenance personnel to see the health of the system insulation at a glance without external tools.

• Redundant Safety: Dual alarm relays allow for a two-stage warning system (e.g., “Maintenance Required” at 50 $k\Omega$ and “System Shutdown” at 10 $k\Omega$).

• Automatic Adaptation: The device automatically adapts to the system leakage capacitance, simplifying the commissioning process.

Precautions (Important Notes)

• Supply Voltage Polarity: For the -427 DC model, ensure correct polarity when connecting the supply voltage to terminals $A1$ and $A2$ to avoid damaging the internal electronics.

• Single Connection Point: Only one insulation monitoring device may be connected to a galvanically coupled IT system. Connecting two devices will cause them to interfere with each other’s measurements.

• Connection to PE: The connection to the functional earth (PE) must be high-quality and redundant. A loose PE connection will result in “Device Error” or dangerously inaccurate readings.

• High Voltage Testing: Before performing high-voltage insulation tests on the system (Megger testing), the IRDH375B must be disconnected from the system to prevent damage to its sensitive measuring input.

Product Applications (Typical Use Cases)

• Variable Speed Drive Systems: Monitoring motor circuits controlled by inverters where DC offsets and high-frequency noise are present.

• DC Control Circuits: Ensuring the integrity of 24V or 48V DC control power in power plants and substations.

• Maritime & Offshore: Monitoring the main power grids of ships and oil rigs where an IT system is used to ensure operational continuity despite a first earth fault.

• Medical Facilities: Protecting Group 2 medical locations where power reliability is critical for life-support equipment.

• Industrial Automation: Monitoring large-scale conveyor systems and production lines in the automotive and chemical industries.

Shipping Port: Xiamen, China

Payment: Bank of Chicago, Bank of Singapore

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