Safety instructions
11
isoHV525_D00297_04_M_XXEN/05.2018
2.3 Intended use
The isoHV525 ISOMETER® monitors the insulation resistance
R
F
of unearthed AC, AC/DC
and DC systems (IT systems) with nominal system voltages of 3(N)AC,
AC/DC 0 … 1000 V or DC 0 …1000 V. The maximum permissible system leakage capa-
citance
C
e
is 150 μF. DC components existing in AC systems do not influence the opera-
ting characteristics, when a minimum load current of DC 100 mA flows. A separate
supply voltage
U
s
allows de-energised systems to be monitored, too.
Please heed the limits of the area of application indicated in the technical specifications.
Any use other than that described in this manual is regarded as improper.
Two variants of the isoHV525 ISOMETER®s are available:
isoHV525-M4-4 with an analog output
isoHV525-S4-4 with a serial interface
Only skilled persons are permitted to carry out the work necessary
to install, commission and run a device or system.
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.
In the event of an alarm message of the ISOMETER®, the insulation fault
should be eliminated as quickly as possible.
If the ISOMETER® is installed inside a control cabinet, the insulation fault
message must be audible and/or visible to attract attention.
Summary of Contents for ISOMETER isoHV525
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