Bender ISOMETER isoCHA425 Manual page 14

Installation, connection and commissioning
Wiring diagram legend:
Terminal
Connection to the supply voltage U
A1, A2
If supplied from an IT system, both lines have to be protected by a fuse.*
Connect each terminal separately to PE:
E, KE
The same wire cross section as for "A1", "A2" is to be used.
L+, L– Connection to the IT system to be monitored
T/R Connection for the external combined test and reset button
11, 14 Connection to alarm relay "K1"
11, 24 Connection to alarm relay "K2"
RS-485 communication interface with connectable terminating resistance
A, B
Example: Connection of a BMS-Ethernet-Gateway COM465IP
* For UL applications:
Only use 60/75 °C copper lines!
For UL and CSA applications, it is mandatory to use 5 A fuses for the pro-
tection of the supply voltage
14
Connections
via fuse (line protection):
s
.
U
s
Installation, connection and commissioning
4.3 Commissioning
1. Check that the ISOMETER® is properly connected to the system to be monitored.
2. Connect the supply voltage U
s
The device carries out a calibration, a self test and adjusts itself to the IT system to be
monitored. When high system leakage capacitances are involved, this procedure
may take up to 40 s. The standard display then appears showing the present insula-
tion resistance, e.g.:
The pulse symbol signals an error-free update of the resistance and capacitance
measuring values. If the measuring value cannot be updated due to disturbances,
the pulse symbol will be blanked.
The voltage of the IT system to be monitored can also be selected as standard dis-
play. By selecting the measured value display U
following acceptance with the
U .
L+L-
3. Start a manual self test by pressing the test button "T". Whilst the test button is
pressed and held down, all display elements available for this device are shown.
During the test, the "tES" symbol flashes. Any internal malfunctions detected are
shown on the display as error codes (see
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 factory setting for suitability.
Are the settings suitable for the installation to be monitored?
The list of factory settings are shown in the tables from
5. Check the function using a genuine insulation fault.
Check the ISOMETER® in the system being monitored against earth, e.g. via a suita-
ble resistance.
to the ISOMETER®.
with the buttons
L+L-
button, the standard display is changing to
page 9). The alarm relays are not checked
page 16.
isoCHA425_D00352_01_M_XXEN/10.2019
and the