NOVAR 2100/2200 Operating Manual
First of all, the first four
control
outputs are disconnected, step by step. Then the instrument waits until
discharge time of the outputs just disconnected expires. During this, the
1
.
1
message flashes in
the line 2 indicating the instrument waits till output No. 1.1 is ready to use.
After all of the outputs discharged, the instrument starts to switch the four outputs step by step. After
each of the step is switched off, detected U1-angle value is displayed (for example
0-L3
) :
Fig. 3.2 : ACD Process – Successful Step Result
When 1Y3 connection type is set the controller supposes a line-to-neutral voltage (L-N, left screen) is
connected; when 1D3 connection type a line-to-line voltage (L-L, right screen) is expected.
If unsuccessful step occurs usually dashes appear (left screen below). Such steps are not unusual
especially when reactive power in measured network fluctuates strongly.
Fig. 3.3 : ACD Process – Unsuccessful Step Results
There may be cases where the angle measured with a permissible tolerance does not match any of
expected options. Then estimated angle with decimal points appear (right screen).
If unsuccessful steps (with the decimal points) of the same results and the question mark
repeat frequently, the most likely cause is incorrectly set connection type. Check it and try to
start the process again.
Ongoing ACD process can be cancelled at any point with the
key. Similarly, any alarm activation
cancels the process too. In such case, the recognized data are neglected and neither U1-angle nor
U
NOM
setting is updated.
The process can have up to 12 rounds with four steps each. After each step, the measurement results
are analyzed. If the results are sufficiently stable, the process is finished and the results are displayed.
Fig. 3.4 : ACD Process – Results
16
number of output just measured
measured step result
U1 input voltage type
