Commissioning - Bender ISOMETER isoES425 Manual

3.4

Commissioning

1. Check that the ISOMETER® is properly connected to the system to be monitored.
2. Connect supply voltage U
The device carries out a calibration, a self test and adjusts itself to the IT system to be monitored. With
high system leakage capacitances this process may take up to 4 min. The standard display then appears
showing the present insulation resistance, e.g.:
The pulse symbol
the measured value cannot be updated due to disturbances, the pulse symbol will be blanked.
3. Start a manual self test by pressing the test button "T" > 1.5 s. While holding the test button all available
display elements are shown. After releasing the button, the test starts and "tES" flashes for the duration of
the test. Detected malfunctions are displayed as error codes (see chapter 2.3.3.1).
The alarm relays are not checked during the test (factory setting). The setting can be changed in the
"out" menu so that the relays switch to the alarm state during the manual self test.
4. Check if the settings are suitable for the system being monitored.
The list of factory settings is shown in the tables from chapter 4.4.
For networks with a leakage capacitance > 5 F, the response value R
of 200 k due to the increased measurement tolerance.
5. Check the functionality by a real insulation fault.
Use a suitable resistor to check the ISOMETER® against earth in the system being monitored.
to the ISOMETER®.
s
signals an error-free update of the resistance and capacitance measured values. If
should be set to a maximum
an1
isoES425_D00214_01_M_XXEN/10.2023
ISOMETER® isoES425
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