Description
This device meets or exceeds the requirements of NEC 250.21(B) and CEC 10-106(2) forground detectors in ungrounded AC systems, as well as the upcoming 2014 requirementof NEC 250.167(A) for ungrounded DC systems. The IRDH275 monitors for ground faults in ungrounded single-phase AC, three-phase AC,and DC systems by monitoring the system's insulation resistance. It may be connected tosystems of up to 793 VAC / 650 VDC. Voltage coupler accessories extend this range. TheAMP Plus measuring principle utilized by the IRDH275 meets the requirements of modernpower systems, including pure DC systems, systems with rectifiers, and systems withvariable frequency drives (VFDs). In systems with high leakage capacitances, the IRDH275automatically adapts itself to ensure an accurate reading. The IRDH275 features a digital display showing the system's insulation resistance'inreal-time. All settings are changed via the device's built-in menu. The IRDH275 utilizes anexternal supply voltage for power, which allows deenergized systems to also be monitored.
Features • Meets or exceeds requirements forNEC 250.21(B) and CEC 10-106(2), aswell as the upcoming 2014 requirement of NEC 250.167(A) • Ground fault detection via insulationmonitoring for ungrounded AC/DCsystems, single-phase or three-phase • Works on systems up to 793 VAC / 650VDC • Voltage ranges extendable up to 7200VAC / 1760 VDC with voltage couplermodules • Two separate adjustable responsevalues, 1 kΩ - 10 MΩ • Advanced measuring principle whichdetects both AC and DC faults, symmetrical faults, automatically adaptsto high system leakage capacitances • Info button to display device settingsand system leakage capacitance • Self monitoring • Automatic self-test setting • Connection for external metering • Built-in and external test/reset • Two separate alarms with two voltagefree SPDT contacts • Normally energized (failsafe) or deenergized (non-failsafe) operation • Backlit LCD display • RS-485 interface
Function When the insulation resistance from system to ground falls below the set response value,the alarm relays switch and the alarm LEDs activate. Two separately adjustable alarmcontacts can be set to a prewarning and main warning alarm. The measured value is indicated on the LCD display or an externally connectable measuring instrument. A latchingsetting ("fault memory") allows the device to reset automatically or require a manual reset. An external and internal test/reset can be activated remotely or on the device. Acomprehensive INFO menu displays additional information such as the system's leakagecapacitance. The IRDH275 continuously monitors the equipment ground connection to ensure properoperation. The device's easy-to-use onboard menu manages all settings via the detailedLCD screen. Additional Features • History memory with real-time clock to store up to 300 timestamped event records • Galvanically isolated RS-485 interface (BMS protocol) for data exchange with otherBender devices and communication systems • Standby contacts and RS-485 communication for operating multiple ground fault detectors in systems tied together with tiebreakers or interlocks • Galvanically isolated analog output, 0(4 ) - 20 mA Use in Interconnected Ungrounded Systems Only one BENDER insulation monitor may be active when several ungrounded systemsare coupled together via a tiebreaker or other means. The disconnect relays and controlinputs F1/F2 integrated into the IRDH275 guarantee no interference with other BENDERdevices when the system tiebreaker is closed. IRDH275B models feature automatic control via RS-485 with no control inputs necessary.
The company focuses on DCS, PLC, robot, large servo four systems
The main products are various modules/cards, controllers, touch screens, servo drivers
Company advantage: Supply imported original products, professional production of spare parts
One year warranty, fast delivery time, complete supply !！！
① 24 hours email response (12 hours);
② For shipment outside Asia, please contact the seller.
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