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Applications and Basic Prog...
PCC1
AAF
AAF
Illustration 6.2 4 AAFs in Master/Slave
The parallel connected filters must have the CT input
signal wired in serial according to Illustration 6.3:
L1
M
12
Illustration 6.3 Single-phase CT-connection Diagram for Master
and Slave
CAUTION
Unshielded cables can lead to noise on the CT and result
in incorrect harmonic filtration. Use shielded cables for
correct EMC installation. Failure to do so can cause
improper equipment function or damage.
The current transformers VA-limitation still have to be kept
for filters in parallel, and so total wire lengths must be
limited according to wire type and CT VA-rating.
[M]=([VA]-1,25)/(25*[Ω/M])
See chapter 4.2.1 Power Connections for more details.
MG90V302
Operating Instructions
AAF
AAF
F1
F2
12
12
Danfoss A/S © 09/2014 All rights reserved.
6.1.4 Control Wire Connection for Parallel
Filter Run
In addition to the CT wiring, all slave units must be
connected to the master via either digital or analog inputs.
Illustration 6.4 shows the necessary control wire
connections:
M
42
F1
42
F2
53
53
27
27
19
19
29
29
20
20
Illustration 6.4 Control Wire Connection of Slave units F1-F3 to
Master M
Table 6.1 shows the necessary connections when fewer
than 4 units are paralleled. The software set-up of digital
and analog input/output is done automatically according
to Table 6.1, based on software programming
parameter 300-40 Master Follower Selection and
parameter 300-41 Follower ID.
Terminal
connection at
follower
Follower 1 (F1)
27
Follower 2 (F2)
27
Follower 3 (F3)
42
All (parallel)
29
All (parallel)
20
Table 6.1 Master/follower Terminal Connections
Follower units will not work if control wires are not
correctly connected. Connect control wiring as directed in
chapter 4 Electrical Installation. Failure to do so can cause
malfunction.
NOTICE
Use screened control wires for correct EMC installation.
6.1.5 Software Set-up of Parallel Filter Run
Running followers in different mitigation mode or with
changed priorities individually compromises performance.
Parallel-connected filters are thus always to be
programmed with same compensation and priority mode.
Ensure all CT settings have been set identically in all
parallel connection units, and all have the same hardware
secondary CT configuration.
F3
42
42
53
53
27
27
19
19
29
29
20
20
Terminal
connection at
master
27
19
53
29
20
37
6
6
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