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Installation and Connection
CTW900 | 43
Table 5.5
– Recommended Fuses for the Protection of the Field Circuit
Fuse
CTW900
Model
Rated
Current
[A]
I
2
t maximum
[A
2
s]
WEG Model
Reference
Code
20A
20
435
FNH00-20K-A
10687494
50A
90A
125A
180A
260A
480A
35
510
FNH00-35K-A
10701721
640A
1000A
1500A
50
2700
FNH00-50K-A
10701718
2000A
ATTENTION!
Fuses must not be used in the field output circuit (F+ / F-).
5.3.5
Line Reactance
The AC/DC converters, especially those that use thyristors for rectifying the voltage and the current, must be
supplied by lines without great voltage oscillations so that they can operate properly.
Therefore, the use of a line reactance together with the CTW900 is essential in order to ensure a supply without
transients for the converter, the same way its use reduces the influence generated by the commutation of the
thiristors on the supply line.
The line reactance must be installed at the converter input (R/S/T), as shown in Figure 5.7.
Figure 5.7
– Position for the installation of the line reactance
The calculation for the dimensioning of the line reactance must be done taking into account, besides the drive
rated current, the voltage and frequency of the supply line. The relationship between those variables is
expressed by the following equation:
rated
line
line
I
f
V
L
1
.
223
where,
L = inductance in Henry (H);
CTW900
(1-Q / 4-Q)
M
Line Reactance
R S T
Содержание CTW900
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