Function
15
RCM420_D00057_03_M_ XXEN/03.2021
The device function can be tested using the TEST button. The parameterizati-
on of the device can be carried out via the LC display and the function keys in-
tegrated in the front plate and can be password-protected.
3.2.1 Connection monitoring
The CT connections are continuously monitored. In the event of a fault, the
alarm relays K1 / K2 switch without delay, the alarm LEDs AL1 / AL2 / ON flash
(Error Code E.01). After eliminating the fault, the alarm relays automatically re-
turn to their initial position, provided that the fault memory M is deactivated.
With the fault memory activated, K1/K2 return to their initial position by pres-
sing the reset button R. A second cascaded measuring current transformer
will not be monitored.
3.2.2 Fast response value query
With the display in standard mode, the currently measured response values
I
Δn1
and I
Δn2
can be queried pressing the Up and Down keys ( < 1.5 s). Switcho-
ver to the Menu mode is not required. If you want to exit the fast response va-
lue query, press the enter key.
3.2.3 Automatic self test
The device automatically carries out a self test after connecting to the system
to be monitored and later every 24 hours. During the self test internal functio-
nal faults will be detected and appear in form of an error code on the display.
The alarm relays are not checked during this test.
3.2.4 Manual self test
After pressing the test button for > 1.5 s, the device carries out a self test. Du-
ring this test, internal functional faults are detected and will be displayed in
form of an error code. The alarm relays are not checked during this test.
While the test button T is pressed and held down, all device-related display
elements appear on the display.
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