The BENDER ISOMETER® IRDH375-UFDK is an advanced insulation monitoring device designed for unearthed AC, AC/DC, and DC systems (IT systems). It is particularly suited for monitoring complex, modern power supply systems that may include frequency converters, DC drives, and high leakage capacitances. Utilizing the patented AMPPlus measuring principle, this device adapts automatically to specific system conditions to provide precise and reliable insulation fault detection.
Technical Specifications
· Nominal System Voltage (Uₙ): AC, 3(N)AC 0…793 V; DC 0…650 V
· Frequency Range (fₙ): DC, 0.2…460 Hz
· Supply Voltage (Uₛ): AC 100…240 V (50…60 Hz); DC 100…240 V
· Response Value Range (Rₐₙ₁ / Rₐₙ₂): 1 kΩ…10 MΩ, independently adjustable for pre-warning and critical alarm
· Max. System Leakage Capacitance: ≤ 500 µF
· Interface: RS-485 (BMS protocol) for data communication with higher-level control and monitoring systems
· Display: High‑resolution graphic LC display for insulation resistance, system voltage, and other parameters
· Analog Output: 0…400 µA for external kΩ display
· Alarm Outputs: Two independent alarm relays with passive changeover contacts; additionally, a system fault relay for device-internal fault reporting
· Operating Temperature: -40 °C … +70 °C (-40 °F … +158 °F)
Key Features & Functions
· Patented AMPPlus Measuring Principle: The device employs Bender's patented AMPPlus measurement technology, delivering accurate monitoring even in systems with extensive DC components and high leakage capacitances. It automatically adapts its measurement method to specific system conditions.
· Automatic Adaptation to System Leakage Capacitance: The device automatically adapts to the existing system leakage capacitance (max. 500 µF), optimising the measurement time and ensuring dependable operation without manual adjustments.
· Two Independently Adjustable Response Values: The device features two separately adjustable alarm relays, allowing users to distinguish between pre-warning and critical alarm. The response value ranges are independently configurable from 1 kΩ to 10 MΩ.
· High-Resolution Graphic LC Display: Equipped with a high-resolution graphic LC display, the device presents measured insulation resistance values, system voltage, and other parameters for easy on‑site status checks and parameter adjustments.
· Integrated RS-485 Communication Interface: The integrated RS‑485 interface supports the Bender Measuring Device Interface (BMS) protocol, enabling seamless data exchange with other Bender devices and simple integration into central monitoring and control systems.
· Automatic Self‑Monitoring Function: The device continuously monitors its own operation and connection integrity. In the event of a fault, a dedicated system fault relay is activated to ensure high operational reliability.
· Voltage Extension via Coupling Devices: The nominal voltage range can be extended using appropriate Bender coupling devices (e.g., AGH series), allowing the ISOMETER® to be applied in higher‑voltage systems such as DC 0…1760 V or 3/(N)/AC 0…7200 V.
· External Test/Reset Functions: External push‑buttons can be connected to perform device and connection testing or to reset stored fault messages, enhancing convenience and safety.
· De‑Energised System Monitoring: Powered by an external supply voltage, the device allows monitoring even when the main circuit is de‑energised, ensuring continuous safety oversight during maintenance or system shutdown periods.
Typical Applications
· Industrial IT Systems — Insulation monitoring for AC, DC, and combined AC/DC unearthed systems incorporating rectifiers, frequency converters, output chokes, thyristor-controlled DC drives, and other power electronic loads.
· UPS Systems and Battery Systems — Continuous monitoring of insulation integrity in uninterruptible power supplies and battery backup installations.
· Systems with High Leakage Capacitance — Installations where interference suppression filters or long cable runs generate significant leakage capacitance to earth.
· Mixed-Voltage Networks — Complex systems where AC and DC components operate within the same IT network.
· Grid-Coupled IT Systems — Installations where multiple IT subsystems are interconnected.
· Phase‑Controlled Heating Systems — Monitoring insulation resistance in systems using phase‑angle control for heating elements.
· Switch‑Mode Power Supply Installations — Systems with high‑frequency switched power supplies.
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