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isoUG425_D00220_00_Q_DEEN / 04.2016
Insulation monitoring device for unearthed
DC systems (IT systems) up to 120 V
Software version: D476 V2.xx
This operating manual is designed for electrically skilled persons working in
electrical engineering and electronics! It does not replace the operating ma-
nual. Make sure that the personnel has read this manual and understood all
instructions relating to safety.
The manual can be found at: http://www.bender.de/manuals
1. Intended use
The ISOMETER® monitors the asymmetrical insulation resistance of unearthed
DC main circuits (IT systems) with mains voltages of DC 12. . .120 V. The maxi-
mum permissible system leakage capacitance
C
e
is 50 uF
In the case of an insulation fault on a power conductor, the
measured residual voltage is evaluated to determine the
insulation resistance R
F
. Only asymmetrical insulation faults
can be detected using the passive measurement method
employed in this ISOMETER®. Equally large insulation faults
between the positive and negative power conductors to
earth (i.e. symmetrical faults) are not detected .
In the event of an alarm message, 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.
EN
ISOMETER® isoUG425
Содержание ISOMETER isoUG425
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