ISOMETER® isoRW425

Ground-fault monitoring device for AC and DC IT systems
Application control circuits in railway vehicles according to EN 50155
Insulation impedance measurement (Z mode) for 50 Hz or 60 Hz
Automatic adaptation to the system leakage capacitance up to 300 μF
Measurement of the nominal system voltage (RMS) with undervoltage and overvoltage detection

The ISOMETER® isoRW425 monitors the insulation resistance of ungrounded AC, AC/DC and DC Systems (IT systems) for railway applications up to AC/DC 0…440 V. DC components existing in AC/DC systems do not influence the operating characteristics. An external supply voltage allows de-energized systems to be monitored too.

Questions? Contact us!

Ground-fault monitoring device for AC and DC IT systems
Application control circuits in railway vehicles according to EN 50155
Insulation impedance measurement (Z mode) for 50 Hz or 60 Hz
Automatic adaptation to the system leakage capacitance up to 300 μF
Measurement of the nominal system voltage (RMS) with undervoltage and overvoltage detection

The ISOMETER® isoRW425 monitors the insulation resistance of ungrounded AC, AC/DC and DC Systems (IT systems) for railway applications up to AC/DC 0…440 V. DC components existing in AC/DC systems do not influence the operating characteristics. An external supply voltage allows de-energized systems to be monitored too.

Questions? Contact us!

Features

Monitoring of the insulation resistance (R mode) or the insulation impedance (Z mode) of unearthed 3(N)AC, AC and
DC systems (IT systems) with galvanically connected rectifiers or inverters
Insulation impedance (Z mode) for 50 Hz or 60 Hz
Measurement of the nominal system voltage (RMS) with undervoltage and overvoltage detection
Measurement of DC voltages system to earth (L+/PE and L-/PE)
Automatic adaptation to the system leakage capacitance up to 300 μF in R mode and 1μF in Z mode
Automatic device self test with connection monitoring
Selectable start-up delay, response delay and delay on release
Two separately adjustable response ranges of 1…990 kΩ (Alarm 1, Alarm 2)

Alarm signalling 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) interface 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 changes of parameters

Applications

AC control circuits in industry, mechanical engineering, power stations, elevators, automation systems and railway systems in accordance with EN 50155
AC control and auxiliary circuits in accordance with DIN EN 60204-1 “Electrical equipment of machines”, IEC 60204-1, EN 60204-1
AC auxiliary circuits in accordance with DIN VDE 0100-725
Smaller AC IT systems such as lighting systems, mobile generators