Operation and configuration
44
isoLR275_D00127_00_M_XXEN/07.2018
5.5
Menu ISO ADVANCED: Setting of the extended
functions
5.5.1
External coupling device (AGH: LR)
Use the isoLR275 only in conjunction with the AGH-LR coupling device. The
menu setting AGH:PV is pre-defined. The current software version does not
allow other settings.
5.5.2
Adaptation of the system leakage capacitance
(Cemax: 150 μF)
This menu can be used to adapt the ISOMETER® to the maximum system
leakage capacitance (max. 500 µF). Refer to the table "Measurement profiles"
for details about the duration of the response time.
Factory setting = 150 µF
5.5.3
Changing the measurement method (Measure: AMP4)
In IT systems, the voltage of which changes at low-frequency as a
consequence of operation, the response time tan depends on the lowest
frequencies occurring between system and earth during operation.
This is typical of converter systems including low-frequency control processes
and direct current motors with low-frequency control processes.
In order to improve the quality of insulation measurements in the different
applications and to avoid incorrect measurements, the special measurement
method suited for the individual application can be selected.
In the following table, the response times in relation to the selected maximum
leakage capacitance are listed and also the measurement profile to be set for
the respective application.
Please note that the capacitance cannot be measured when
using the profiles AMP3 or AMP4. Hence, no result will be
displayed when the current leakage capacitance is queried by
means of the
"
INFO
"
button.
