6. Perform an Auto CT-detection (300-29) if the
following conditions are met: the CTs are installed
on the PCC side (towards the transformer), CTs
do not use sum transformers, the filter is not
supplied through a transformer, and the filter is
>10% of the CT primary.
7. Check the filter parameters according to CT
installation in the following parameters: Primary
Rating (300-20 CT Primary Rating), Sequence
(300-24 CT Sequence), Polarity (300-25 CT Polarity).
8. Mount the CT short at all three CT inputs on the
CT input terminal (factory pre-mounted).
9. Provide the active filter with a run command.
10. Check that the filter current shown on the LCP is
lower than 15% of the nominal filter current. If
higher, conduct a hardware fault inspection.
11. Stop the active filter and remove all three CT
short lugs.
12. Check the filter parameters according to
application requirements in the following
parameters: Priority (300-01 Compensation Priority),
Harmonic Selection Mode (300-00 Harmonic
Cancellation Mode and 300-30 Compensation
Points), and Cos fi Reference (300-35 Cos-phi
Reference).
13. Provide the active filter with a run command.
14. Monitor that the total harmonic current and
voltage distortion is reduced. If not, check CT
input/installation for faults or configuration errors.
15. Copy parameter settings to the LCP memory
0-50 LCP Copy for backup.
Test Procedures VLT Advanced Active Filter AAF006 D and E Frames Service Manual
MG90Z122 - VLT
®
is a registered Danfoss trademark 6-9
6
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