The active filter uses external CT signals to measure the
current distortion that the filter is to compensate. External
CT wires are connected to the CT terminal block. The CT
terminal block is wired to the AFC board through internal
wiring. The active filter supports external current
transformers with either a 1A and 5A secondary.
•
For 1A CT input, the 8-pin connector must be
wired to terminal MK108.
•
For 5A CT input, connection must be wired to
terminal MK101.
Primary rating (A)
1 A
250
300
400
500
600
750
1000
5 A
1250
1500
2000
2500
3000
3500
4000
Table 2.7
130BB950.10
1
3
4
5
6
2
Figure 2.8 Active Filter Card
1
MK101 (5 A external connector)
4
MK107
2
MK108 (1 A external connector)
5
MK100
3
MK103
6
FK100
Table 2.8
External CT settings are programmed in parameter group
300-2*. The automatic CT detection is only possible with
CT installed on the PCC side.
130BP093.10
0.0%
300-29 Start Auto CT
Detection
[1] Enable Auto CT Detect...
0.00
1 (1)
300-2*
CT Settings
Figure 2.9 Auto CT Detection
Perform an automatic CT detection for all stand alone
filters in
300-29 Start Auto CT Detection
The following conditions must be met:
•
Active filter bigger than 10% of CT RMS rate
•
CTs installed on the PCC side. (Auto CT not
possible for load side CT installation.)
•
Only one CT per phase. (Auto CT not possible for
summation CTs.)
•
CTs are part of standard range.
Unsuccessful Auto CT Detection can indicate an incorrect
CT installation. Check the CT installation and program the
CTs by hand.
Operator Interface and Acti...
VLT Advanced Active Filter AAF006 D and E Frames Service Manual
2-6
MG90Z122 - VLT
®
is a registered Danfoss trademark
2
2
