Function Test Menu - DEMA CPM 310 G User Manual

Function Test Menu

Function Test Menu is a test triggering menu, via which
a test is launched to check the functionality of the CPM
310 G unit and the trip circuit.
When the Function Test Menu is accessed, the user is
asked to enter the password. Password requirement is
important; as running the function test will result in the
tripping of the CB and breaking of the primary supply,
if special precautions are not taken, thus, the test
should only be initiated by authorized personnel.
Once the password is entered, the Function Test Menu
is reached (the top picture). The menu asks for
confirmation to run the test; pressing S2 (N) or S5
(CNC) button will cancel the test, leading back to the
Automatic Control Settings Menu; while pressing S1 (Y)
Main Screen » Menu »
button will start the function test.
Function Test
As the test is started, the text that tells that the test is
in progress until the test is over (the middle picture). If
it is needed to terminate the test at this phase,
pressing S5 (ESC) button will do the job.
If the test is not interrupted, the test completes after a
time that depends on the settings of the protective
functions. The user is noticed when the test is over
(the bottom picture).
During the function test, the relay processor creates
virtual current readings around 40 I and runs the
n
active protection settings under these virtual
conditions. When these virtual conditions occur, e.g. on
a relay that is configured to have active I> and Ie>
functions, the test will result in tripping of the CB at the
set time characteristics of the active protective
functions and tI> and tIe> alarms for each phase will
be generated.
If it is observed that some of the protective functions
do not generate alarms as expected, it is concluded
that those functions do not operate correctly and
corrective actions must be taken. Similarly, if the CB
does not trip during a function test while the relay has
active protective functions, the trip circuit and the CB
must be checked for errors and failures.
After the assembly of any CPM units or CBs, or during
regular system checks, function tests are recommended
to be performed, to ensure the reliability of the system
after commissioning. □
- 126 -