Total current [A] Maximum individual harmonic compensation
I5
I7
I11
I13
I17 I19 I23 I25
190
133 95
61
53
38
34
30
27
250
175 125 80
70
50
45
40
35
310
217 155 99
87
62
56
50
43
400
280 200 128 112 80
72
64
56
Table 4.10 Maximum Individual Harmonic Compensation
4.2.10 Operating with Capacitor Banks
The active filter is able to run with capacitor banks as long
as the resonance frequency of the capacitor bank is not in
the operation range of the active filter.
NOTICE
Always use de-tuned capacitor banks in installations with
frequency converters and active filters to avoid
resonance phenomena, unintended tripping or
component breakdown.
For de-tuned capacitors, the resonance frequency
capacitors should be tuned for an inter-harmonic number
lower than the 3rd harmonic.
NOTICE
If installed with capacitor banks of any kind, the active
filter must operate in selective compensation mode.
The capacitor bank should be installed upstream of the
filter toward the transformer. If this is not possible, install
the current transformers such that they do not measure
both needed current compensation and the capacitor
corrected current.
PCC1
M
M
AAF
130BB517.11
Illustration 4.13 Capacitor bank mounted upstream. CTs do
not measure capacitor current.
Illustration 4.13
shows recommended installation of the
active filter and CT placement in installations containing
capacitor banks.
PCC1
130BB518.11
M
M
AAF
Illustration 4.14 Incorrect Installation
Electrical Installation
Operating Instructions
24
Danfoss A/S © 09/2014 All rights reserved.
MG90V302
4
4
