Danfoss VLT AAF00x, Instruction Manual

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4.7.2 Control Wire Connection for Parallel
Filter Run
Additional to the CT wiring, all follower units have to be
connected to the master via either digital or analog inputs.
The figure below shows the necessary control wire
connections:
M 42
53
27
19
29
20
42
53
27
19
29
20
F1
42
53
27
19
29
20
F2
42
53
27
19
29
20
F3
130BB716.11
Figure 4.45 Control wire connection of follower units F1-F3
(AAF2-4) to master unit M (AAF1)
The table below shows the necessary connections when
less than four units are paralleled. The software set-up of
digital and analog in/output will be done automatically
according to below table based on software programming
300-40 Master Follower Selection and 300-41 Follower ID .
Terminal connection
at follower Terminal connection
at master
Follower 1 (F1) 27 27
Follower 2 (F2) 27 19
Follower 3 (F3) 42 53
All (parallel) 29 29
All (parallel) 20 20
WARNING
Follower units will not work if control wires are not
correctly connected.
NOTE!
It is advised to use shielded control wires for correct EMC
installation.
4.7.3 Software Set-up of Parallel Filter Run
It is not practical to have followers running in different
mitigation mode or with changed priorities individually, as
desired performance cannot be guaranteed. Parallel
connected filters are thus always to be programmed with
same compensation and priority mode. Also make sure all
CT settings have been set identically in all parallel
connection units, and all has same hardware secondary CT
configuration.
The automatic CT detection is still effective for filters in
master-follower configuration but it is recommend setting
follower units manually. It is advised to use the following
procedure for setting the CT values:
1. Program master unit 300-10 Active Filter Nominal
Voltage
2. Program master unit 300-26 CT Placement
3. Perform an automatic CT detection on master
unit
300-29 Start Auto CT Detection
4. Note the auto CT result and manually program
each follower unit.
5. Ensure identical settings in 300-10 Active Filter
Nominal Voltage , 300-26 CT Placement and on
each unit.
Alternatively, each follower unit can conduct an automatic
CT detection after the master unit is turned off. Only run
one auto CT detection at a time.
Additional to above mentioned CT setting it is also
necessary to set each unit to have its respective role in the
cascade network.
300-40 Master Follower Selection is set to
master or follower for each unit.
300-40 Master Follower Selection
Option: Function:
[0] Master If operating active filters in parallel, select
whether this AF is a master or a follower
active filter.
[1] Follower
[2]
*
Not Paralleled
WARNING
Make sure only one master is set in each group of parallel
connected filters. Verify that no other unit is set to master.
After changing this parameter, additional parameters are
accessible. For the master units,
300-42 Num. of Follower
AFs must be programmed for the amounts of followers
(followers) connected.
300-41 Follower ID
Range: Function:
1
*
[1 - 3 ] Enter the unique ID of this follower. Verify that no
other follower uses the same ID.
NOTE!
300-41 Follower ID is not accessible unless 300-40 Master
Follower Selection is set to follower.
How to Install VLT Active Filter AAF 00x
MG.90.V2.22 - VLT
®
is a registered Danfoss trademark 4-35
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