Wiring diagram for a three-phase system. Only two connections
to the system are necessary to monitor all three phases.
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 latching
setting ("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. A
comprehensive INFO menu displays additional information such as the system's leakage
capacitance.
The IRDH275 continuously monitors the equipment ground connection to ensure proper
operation. The device's easy-to-use onboard menu manages all settings via the detailed
LCD screen.
• 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 other
Bender 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
• Meets or exceeds requirements for
NEC 250.21(B) and CEC 10-106(2), as
well as the upcoming 2014 requirement
of NEC 250.167(A)
• Ground fault detection via insulation
monitoring for ungrounded AC/DC
systems, single-phase or three-phase
• Works on systems up to 793 VAC / 650
VDC
• Voltage ranges extendable up to 7200
VAC / 1760 VDC with voltage coupler
modules
