Interfaces; Self Test - Bender ISOMETER isoRW685W Manual

Function
The ISOMETER® has an internal system isolating switch, which makes it possible to opera-
te several ISOMETER®s in coupled IT systems. For this purpose, the ISOMETER®s are con-
nected via an Ethernet bus. The integrated ISOnet function ensures that only one
ISOMETER® is actively measuring at a time, while the other devices are completely iso-
lated from the system and waiting in standby mode for measuring permission.
The ISOMETER® is able to synchronise itself with other ISOMETER®s. This makes it possible
to monitor capacitive coupled IT systems without interfering with each other.

3.4 Interfaces

• Communication protocol Modbus TCP
• Communication protocol Modbus RTU
• BCOM for communication of Bender devices via Ethernet
• BS bus for communication of Bender devices (RS-485)
• isoData for recording and managing measured values
• Integrated web server for reading out measured values and setting parameters

3.5 Self test

After switching on the supply voltage, the ISOMETER® automatically and continuously
checks all internal measuring functions, the components of the process control such as
the data and parameter memory, as well as the connections to the IT system and earth.
The self test can also be activated manually by means of the test button to check the func-
tions of the relays (depending on the configuration) or it can be selected via the "Control"
menu (refer to „Control").
The progress of the manual self test is shown on the LC display by a bar graph. Depending
on the conditions in the IT system being monitored, the self test is completed after 15...20
seconds. The device then returns to the standard mode (measurement mode) and the ac-
tual measured value will be displayed after the measuring time has expired. The display
shows the message Initial measurement until the first valid value is measured (refer to
„Initial measurement").
10
Function
If a fault is detected during the self test, the respective LEDs of the device light (refer to
„Alarm messages"). In addition, the respective message will be indicated on the display
and a previously programmed output will provide the respective signal.
TEST
√
Measurement
technique
Coupling
Connection
33 %
Test successful
Test unsuccessful
Test not available
(e.g. incorrect device settings).
Test is being carried out.
isoRW685W-D_D00178_04_M_XXEN/02.2019