BENDER IRDH275B-427 Output module

Product Detailed Description

• Core Function: The IRDH275B-427 constantly monitors the insulation resistance between the system conductors (L1, L2, L3, or L+, L-) and earth (PE). This is critical in IT systems, where the first insulation fault does not immediately cause a short circuit or trip but presents a potential safety hazard if a second fault occurs. The ISOMETER® provides early detection of such faults.

• Measurement Principle: It employs Bender's patented AMPPlus measurement method. This advanced method is specifically designed for modern power supply systems, which often include rectifiers, converters, thyristor-controlled DC drives, and other components that introduce extensive directly connected DC components and high system leakage capacitances. The AMPPlus method ensures accurate monitoring even in these complex and noisy environments.

• Alarm System:

• Features two separately adjustable alarm relays (pre-warning and main alarm).

• When the insulation resistance falls below a set response value (Ran1 for pre-warning, Ran2 for main alarm), the corresponding alarm relays switch, and alarm LEDs (Alarm 1, Alarm 2) illuminate.

• The "B" version includes a history memory with a real-time clock to store all alarm messages with a date and time stamp, aiding in fault analysis and predictive maintenance.

• Display and Operation:

• Equipped with an LC display that shows the system's current insulation resistance in real-time.

• Integrated function buttons (INFO, TEST, RESET, MENU, arrow keys) on the front plate allow for easy parameterization, querying of information, and device testing.

• Self-Monitoring: The device continuously monitors its own function and connections to earth. A "system fault" LED and relay activate if an internal device error or connection fault occurs.

• Communication: The "B" version includes an electrically isolated RS-485 interface (BMS protocol) for communication with other Bender devices, allowing for remote monitoring and integration into higher-level control systems.

• Automatic Adaptation: Automatically adapts to the system leakage capacitance to ensure accurate readings, especially important in systems with extensive cabling or filters.

• Test Function: A built-in TEST button allows for self-testing of the device's function and connections to earth. External test and reset buttons can also be connected.

Product Parameters

• Nominal Voltage Range (Un):

• AC: 0...793 V (Single-phase or Three-phase)

• DC: 0...650 V

• Note: Nominal voltage range can be extended for higher voltages using external coupling devices like AGH150W-4 (up to 1760 V DC) or AGH675S-7 (up to 15.5 kV AC/DC).

• Supply Voltage (Us) for IRDH275B-427:

• AC: 19.2...55 V

• DC: 19.2...72 V

• Frequency Range Us: 42...460 Hz

• Response Values (Adjustable):

• Ran1 (Alarm 1 / Pre-warning): 1 kΩ...10 MΩ

• Ran2 (Alarm 2 / Main Alarm): 1 kΩ...10 MΩ

• Relative Uncertainty (20 kΩ...1 MΩ): ±15 % (according to IEC 61557-8:2007-01)

• Alarm Relays: Two separate alarm relays with potential-free changeover contacts.

• System Fault Relay: One relay for internal device faults or connection errors.

• Measurement Method: AMPPlus

• Display: LC Display (Digital display of insulation resistance in real-time)

• Interface (for B version): Electrically isolated RS-485 (BMS protocol)

• History Memory (for B version): With real-time clock for timestamped alarm messages.

• Mounting: DIN rail mounting.

• Connection: Screw terminals.

• Degree of Protection (Housing): IP20

• Operating Temperature Range: -10 °C to +55 °C

• Storage Temperature Range: -40 °C to +70 °C

• Standards: IEC 61557-8, EN 61557-8, UL, CSA, CCC, CE (depending on specific certifications and applications).

Product Advantages

• Enhanced Safety: Provides continuous insulation monitoring in IT systems, detecting insulation faults at an early stage before dangerous leakage currents or system failures occur. This is crucial for personnel protection and fire prevention.

• High Operational Reliability: Prevents unplanned downtime by signaling insulation degradation before it leads to a complete breakdown. It allows for scheduled maintenance and fault resolution.

• Advanced Measurement Method (AMPPlus): Reliably monitors complex power systems with modern components (converters, rectifiers) and high system leakage capacitances, where conventional devices may fail or give inaccurate readings.

• Precise Fault Localization (Indirectly): Two adjustable alarm levels allow for differentiated fault signaling (pre-warning vs. main alarm), aiding in prioritizing and planning maintenance actions.

• Comprehensive Diagnostics (B version): The history memory with real-time clock provides valuable data for fault analysis, root cause identification, and predictive maintenance strategies.

• Easy Integration: The RS-485 interface allows seamless integration into SCADA, DCS, or building management systems for centralized monitoring.

• Versatile Application: Suitable for AC, DC, and AC/DC IT systems across a wide voltage range (especially with coupling devices).

• Robust and Reliable: Designed for demanding industrial environments.

Precautions

• IT System Specific: This device is only for use in unearthed (IT) power systems. It is not suitable for directly earthed (TN/TT) systems.

• Correct Supply Voltage: Ensure the supply voltage matches the specified range for the IRDH275B-427 (AC 19.2-55 V / DC 19.2-72 V). Using incorrect voltage can damage the device.

• Proper Installation and Wiring: Adhere strictly to the Bender installation manual. Incorrect wiring (especially of the monitoring lines to the system and earth) can lead to inaccurate readings or device malfunction.

• Coupling Devices: For systems with nominal voltages exceeding 793 VAC or 650 VDC, an appropriate Bender coupling device (e.g., AGH150W-4 or AGH675S-7) must be used. Ensure correct wiring and configuration of the coupling device.

• Parameter Setting: Carefully set the alarm response values (Ran1, Ran2) according to the system's requirements and relevant standards. Incorrect settings may compromise safety or lead to nuisance alarms.

• Environmental Conditions: Install the device within its specified operating temperature and humidity ranges. Protect it from excessive vibration, direct sunlight, and corrosive atmospheres.

• Safety Standards: Always comply with relevant local and international electrical safety standards (e.g., IEC 60364, EN 61557-8) for IT systems when installing and operating.

• Qualified Personnel: Installation, commissioning, and maintenance should only be performed by appropriately qualified and authorized personnel who are familiar with IT systems and insulation monitoring devices.

• Regular Testing: Periodically test the device's function using the integrated TEST button or an external test facility as part of a regular maintenance schedule.

Product Applications

Bender IRDH275B-427 ISOMETERs are widely applied in critical industrial and commercial sectors where unearthed (IT) power systems are used for enhanced safety, reliability, and continuous operation.

• Healthcare Facilities (Hospitals, Clinics): Operating theaters, intensive care units, and other critical areas where uninterrupted power supply and highest safety levels are paramount.

• Mining: Power supply systems for underground equipment, where a sudden shutdown due to a single earth fault is unacceptable and dangerous.

• Industrial Plants: Chemical plants, steel mills, automotive manufacturing, and other continuous process industries where high availability is crucial.

• Data Centers: Ensuring the reliability of power supply to critical IT equipment.

• Renewable Energy:

• Solar (PV) Systems: Monitoring insulation resistance in large-scale PV installations, especially those with inverters and transformers, to detect insulation faults and prevent potential arc faults or fires.

• Wind Turbines: Monitoring the internal electrical systems of wind turbines.

• Electric Vehicle (EV) Charging Stations: Monitoring the insulation of the charging infrastructure.

• Power Distribution Systems: Critical feeders and substations where continuous operation is essential.

• Marine and Offshore Applications: Electrical systems on ships, oil rigs, and other offshore platforms, where IT systems are often used for safety and redundancy.

• Mobile Generators and UPS Systems: Protecting standalone power generation and backup systems.

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