isoNAV685-D_D00215_02_M_XXEN/04.2017
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12. Device profiles
Adjustment to different applications can be carried out very easily by selecting a device profile.
response times see
Nominal system
voltage
Mains
frequency
System
leakage
capacitance
Measuring
voltage
Description
Power circuits
AC 0…690 V/
15…460 Hz
0…150
µF
±50 V
Main circuits without dynamic frequency changes.
The universal profile is suitable for all systems primarily with constant mains fre-
quencies and extraneous DC voltages. When using inverters and dynamic fre-
quency control, select Inverter > 10 Hz or Inverter < 10 Hz.
Inverter > 10 Hz
AC 0…690 V/
DC 0…1000 V
10…460 Hz
0…20
µF
±50 V
This profile is used for systems with dynamic frequency control by inverters in
the range 10 to 460 Hz in order to optimise the measurement with respect to
the measuring time and quality.
Inverter < 10 Hz
AC 0…690 V/
DC 0…1000 V
1…460 Hz
0…20
µF
±50 V
For systems involving extremely low-frequency control in the range of up to
1...460 Hz and very low and continuously changing extraneous DC voltages due
to dynamic load conditions in an IT system, continuous insulation monitoring
can be optimised using this profile.
The DC offset voltage and therefore the instantaneous tripping is
only correct in a 60 Hz IT system. Other mains frequencies may
cause incorrect readings and false alarms.