BENDER AGH420

The ISOMETER® measures the insulation resistance RF and the system leakage capacitance Ce between the

system to be monitored (L1/+, L2/–) and earth (PE). The RMS value of the nominal system voltage Un between

L1/+ and L2/– as well as the residual voltages UL1e (between L1/+ and earth) and UL2e (between L2/– and earth)

are also measured.

• Monitoring for unearthed AC and DC systems with galvanically connected rectifiers or frequency converters

• Measuring the nominal system voltage Un (true RMS) with undervoltage/overvoltage detection

• Selectable start-up delay, response delay and delay on release

• Measuring the residual voltages of the supply system to earth (L1/+, L2/– to PE)

• Automatic adaptation to the system leakage capacitance Ce up to 1000 μF

• Automatic device self test with connection monitoring

• Two separately adjustable response value ranges from 1…500 kΩ (alarm 1, alarm 2)

• Alarms output via LEDs ('AL1', 'AL2'), a display, and alarm relays ('K1', 'K2')

• Selectable N/C or N/O relay operation

• Measured value display via multi-functional LC display

• Fault memory can be activated

• Password protection against unauthorised changing of parameters

• RS-485 (galvanically isolated) including the following protocols:

– BMS (Bender measuring device interface) for the data exchange with other Bender devices

– Modbus RTU

– IsoData (for continuous data output)

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