Isulation monitoring device with AGH420 coupling device

The main application fields are unearthed DC charging stations (mode 4 according to IEC 61851-23) for electric vehicles (IT systems) with nominal system voltages of DC 0…1000 V. Due to a separate supply voltage, de-energised systems can also be monitored.

The currently measured insulation resistance is indicated on the LC display. If the reading is below the selected response value, the response delay "t_on" begins. Once the response delay "t_on" has elapsed, the alarm relays "K1/K2" switch and the alarm LEDs "AL1/AL2" light up. The point of fault L+, L- or the symmetrical insulation resistance is indicated on the display.

Device features

• Monitoring for DC charging stations (mode 4 according to IEC 61851-23)
• Mains voltage measurement (r.m.s.) with under-/overvoltage detection
• DC voltage measurement to earth (L+/PE and L-/PE)
• Automatic adaptation to the system leakage capatiance up to 5 µF
• Automatic device self-test with connection monitoring
• Selectable start-up delayx, response delay and delay on release
• Two separetely adjustable response value ranges of 1…500kΩ (Alarm 1, Alarm 2)
• Alarm siglalling via LEDs (AL1, AL2), a display and alarm relays (K1, K2)
• N/C operation or N/O operation selectable
• Measured value indication via multifunctional LCD
• Fault memory can be activated
• RS-485 (galvanically isolated) including the following protocols:
  BMS interface (Bender measuring device interface) for data exchange with other Bender components
  Modbus RTU
  IsoData (for continuous data output)

Password protection to prevent unauthorised parameter changes