Manual Power Quality Filter PQFM
The PQF-Manager user interface 129
If the CTs have been wrongly connected and the results are acknowledged by the
commissioning engineer, the filter controller will automatically take into account the
wrong positions and correct them internally. Hence, there is no need to correct the CT
connections manually. However, in line with proper installation guidelines, it may be
recommended to correct physically the CT installation. In that case, the CT setup of
the filter has to be adapted accordingly.
−
When the CT positions have been acknowledged the filter will carry on by showing
the CT ratio found phase per phase. The values shown are indicative only and
always have to be verified by the commissioning engineer. He can change the
values by entering the right CT ratio. In order to approve the value entered
has to be pressed.
explains the meaning of the text that appears on the
display:
Table 49: Automatic CT detection ratio-results presentation
Text on PQF-Manager display Meaning
Ratio found
Ratio found for the CT in the considered phase
E.g. 200 means a CT of 1000/5
CT Ratio L1
(a)
Ratio that will be used by the filter for the CT physically
connected in phase 1 (L1, R, U) of the installation
CT Ratio L2
(a)
Ratio that will be used by the filter for the CT physically
connected in phase 2 (L2, S, V) of the installation
CT Ratio L3
(a)
Ratio that will be used by the filter for the CT physically
connected in phase 3 (L3, T, W) of the installation
Remark:
(a)
The first phase has to be acknowledged before the second phase is displayed…
After acknowledging the last phase with
, the filter will automatically reset and the
new values will be taken into account. Pressing
at any time will interrupt the
automatic CT detection process. In single unit filters, original CT-values and positions
existing prior to the start of the procedure will be restored. In multi-unit filters, the new
values will be stored in the units for which the CT setting were already accepted, and will
be restored to the initial value in the other units.
If the CT identification ended unsuccessfully:
−
The filter displays an error message indicating the reason for the problem.
gives a list of the possible error messages.
Table 50: Possible error messages during automatic CT identification
PQF-Manager error messages during automatic CT identification
The CT identification found inconsistent CT positions.
The CT identification did not end within an appropriate time frame.
The CT identification required an abnormally high DC voltage.
The most common causes for these messages are:
•
CTs not connected or shorted