300-42 Num. of Follower AFs
Range:
Function:
1
*
[1 - 3 ] Enter the total number of follower active filters. The
master active filter will only control this number of
followers.
NOTE
is not accessible unless
300-40 Master Follower Selection
is set to master.
Each follower unit has to be programmed at
. The ID of the followers needs to be
different from each other.
Before starting the units (pushing auto-on button) it is
advised to check that the following parameters all have
been correctly programmed and have similar values for all
units sharing one set of CTs:
300-00 Harmonic Cancellation Mode
300-20 CT Primary Rating
4.8 Final Set-Up and Test
External CT settings are programmed via parameter group
300-2*. It is advised to perform an automatic CT-detection
for all standalone filters via
300-29 Start Auto CT Detection
.
Filter supports all standard CTs with 1A or 5A secondary
rating.
NOTE
The automatic CT-detection is only possible with CT
installed on the source side
CTs should have an accuracy of 0.5% or better to reassure
sufficient accuracy.
To test the set-up and ensure that the Active Filter is
running correctly, follow these steps:
CAUTION
Incorrect current transformer connection, installation or
configuration will lead to unintended and uncontrollable
behaviour of the filter.
1.
2.
300-29 Start Auto CT Detection
Follow these steps to reassure correct installed current
transformers:
1.
Locate the CT.
2.
Note the position in the installation and the
secondary and primary current level.
3.
Check that mechanical CT-pin connection MK108
or MK101 is according to CT-secondary rating.
4.
Enter the CT-location in
5.
Enter the primary current from the plate data in
this
Performing an Auto CT:
The automatic current transformer detection will set the CT
polarity, phase sequence and current ratio.
Stop the CT detection during operation:
Press the [off] key – the filter enters into alarm mode and
display show that the Auto CT was terminated by the user.
Successful CT detection:
The display will show the found ratios, parameters, and the
phase sequence. Press [OK] to accept the found
parameters. After the CT detection the filter is ready to
start operation.
CT detection failed:
Danfoss CT auto detection support most standard CTs. The
auto CT detection will not succeed if:
•
CTs are not wired correctly
•
CTs are installed on load side
•
Primary rate is not a standard size
•
Secondary rate and CT placement is not
configured
•
CT current primary rate is bigger then 10 times
filter current rate
A manual configuration is needed in case the automatic CT
detection fails to set the CTs. In that case set the following
parameters according to the CT plate data and installation:
1.
300-20 CT Primary Rating
2.
300-24 phase sequence
3.
300-25 CT polarity
How to Install
VLT Active Filter AAF 00x
MG.90.V2.02 - VLT® is a registered Danfoss trademark
41
4
4
