Safety instructions
13
isoRW425_D00052_03_M_XXEN / 02.2017
2.3 Intended use
The ISOMETER® monitors the insulation resistance (R mode) or the insulation
impedance (Z mode) of unearthed AC/DC main circuits (IT systems) with nom-
inal system voltages of 3(N)AC, AC, AC/DC or DC 0 … 400 V. DC components
existing in 3(N)AC, AC/DC systems do not influence the operating characteris-
tics, when a minimum load current of DC 10 mA flows. A separate supply volt-
age allows deenergised systems to be monitored as well. The maximum
permissible system leakage capacitance C
e
is 300 µF in R mode and 1µF in Z
mode.
To ensure that the ISOMETER® functions correctly, an internal
resistance of
≤
1 kΩ must exist between L1/+ and L2/- via the
source (e.g. the transformer) or the load.
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