174 The PQF-Manager user interface
Manual Power Quality Filter PQFM
Once the harmonic is selected, analyze the spectrum of the line currents to see if the
selected harmonic is filtered. Refer to
Section 7.8.2
for more information on displaying
measurement results. If the harmonic is not filtered properly (e.g. if it is amplified),
deselect the harmonic and refer to
Chapter 11
for troubleshooting the problem.
When harmonic load is not present, the filter can be tested by generating static reactive
power. Initially a low value can be set which can then be gradually increased to the
nominal filter rating.
−
For setting up the filter’s main reactive power feature go to
[/Welcome/Settings/Customer set./Main settings/Main PFC/Bal.].
−
For setting up the filter’s auxiliary harmonics selection go to
[/Welcome/Settings/Customer set./Auxiliary settings/Aux. PFC/Bal.].
Set the ‘PFC Type’ item to ‘Static cap.’ and choose the desired value for the item ‘Q
static’.
For more information on the main and auxiliary settings concept, refer to
Section 7.9.1.1
.
Once the reactive power is selected, analyze the filter current. Refer to
Section 7.8.2
for
more information on displaying measurement results. Refer to
Chapter 11
in case of
problems. Disable the reactive power setting after the test if it is not required by the
user.
8.10 Step 9: Set up the user requirements
If everything goes well at this stage, the user requirements for harmonic filtration and
reactive power compensation/balancing can be set up. Both main and auxiliary settings
can be programmed if desired.
By default the filter is set up to take into consideration the main settings only.
−
Select the desired filter mode.
−
Select the harmonics and the curve level.
−
Select the reactive power and balancing settings.
Background information on all the items discussed above is given in
Section 7.9.1.1
.
At this stage, verify the functioning of the settings made for the digital I/O if possible
(e.g. remote control, local start/stop buttons).
Remarks:
−
Refer to
Chapter 11
for troubleshooting problems.
−
Filter running at 100% load while RMS current rating is not attained.
Under exceptional conditions it is possible that the active filter is showing a 100%
load indication whereas its nominal RMS current rating is not yet attained. This is
because the filter has reached an operating limit other than the RMS current limit.
Possible other limits are:
