Step 5: Automatic And Manual Ct Detection Procedure; Automatic Ct Detection Procedure - ABB PQFS Installation, Operation And Maintenance Instructions

If the CTs have been set up correctly at this stage, go to step 6
If there is a need to do a manual check of the CT connections, go to step 5
8.6

Step 5: Automatic and manual CT detection procedure

WARNING: Do not filter harmonics or do reactive power compensation/balancing
when the CTs have not been set up correctly. Failure to adhere to this guideline will
result in erratic filter operation.
Refer to
WARNING: Before programming or detecting the CTs, make sure that:
-
-
CT shorting links are provided with the filter for servicing purposes, but they are not
installed by default on the X21 terminal.
The CT settings can be detected with the automatic CT detection feature or in a
conventional way. The automatic CT detection approach allows compensating for
physical connection errors in software.
detection feature will automatically try and detect the CT-connections for the different
units.
8.6.1

Automatic CT detection procedure

The automatic CT detection procedure and the precautions to take when using it are
explained in detail in
Section 8.6.2
procedure is not used or does not find the correct results.
7.7.1.2 for detailed information on how to set up digital I/O, alarms and warnings.
In order to achieve full redundancy with master-master filters, the digital I/O have
to be cabled to all master units and all the PQF-Managers have to be set up
accordingly.
· In order to change the temperature unit used by the system, go to
[/Welcome/Settings/Customer set./Temp unit].
· For setting up advanced filter functions such as the autorestart feature (after
power outage), the filter standby feature (which stops the IGBTs when the load
requirement is low), the system clock, the external communication protocol
(Modbus or PC) and the software lock, refer to
full redundancy for the communication features in master-master filters, this
function has to be cabled to all master units and all the PQF-Managers have to
be set up accordingly.
Section 6.9 and Section 6.10
The CTs have been connected to the filter CT terminal X21. For multi-filter
configurations all the units of a filter system have to be supplied with the same
CT information (daisy chain principle with return path as shown in
All shorting links in the CT path have been removed (i.e. on the CTs, on the
filter CT terminal X21 ...)
Section
discusses a way to check the CT installation if the automatic CT detection
for the CT selection and installation guidelines.
For multi-unit functions, the automatic CT
7.7.2.3.
Manual Power Quality Filter PQFS ç Commissioning instructions 115
Section 7.7.3. In order to achieve
(Section 8.7)
(Section
Figure
8.6)
47)