Function; Intended Use; Device Features - Bender ISOMETER isoGEN423 Manual

Function

2 Function
2.1

Intended use

The ISOMETER® monitors the insulation resistance R
with nominal system voltages of 3(N)AC, AC/DC 0. . .400 V or DC 0. . . 400 V. The maximum permissible
system leakage capacitance C
characteristics when a minimum load current of DC 10 mA flows. The separate supply voltage U
energised systems to be monitored as well.
In order to meet the requirements of the applicable standards, customised parameter settings must be made
on the equipment in order to adapt it to local equipment and operating conditions. Please heed the limits of
the range of application indicated in the technical data.
Any other use than that described in this manual is regarded as improper.
To ensure that the ISOMETER® functions correctly, an internal resistance of ≤ 1 k must exist between L1/+
and L2/- via the source (e.g. the transformer) or the load.
If the ISOMETER® is installed inside a control cabinet, the insulation fault message must be audible and/or
visible to attract attention.
2.2

Device features

• Monitoring of the insulation resistance R
• Measuring the nominal system voltage U
• Selectable start-up delay, response delay and delay on release
• Measuring the residual voltages of the supply system to earth (L1/+, L2/– to PE)
• Two operating modes: GEn and dc
• Automatic adaptation to the system leakage capacitance C
• Automatic device self test with connection monitoring
• Two separately adjustable response value ranges from 5...200 k (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)
8 isoGEN423_D00221_05_M_XXEN
is 5 F. DC components existing in AC systems do not influence the operating
e
for unearthed AC/DC systems
F
(true RMS) with undervoltage/overvoltage detection
n
of unearthed AC, AC/DC and DC systems (IT systems)
F
bis 5 F
e
allows de-
s