GE Industrial Solutions DV-300 DC Drive Users Manual - Manual (Page 73)

DV-300 Adjustable Speed Drives
——— WIRING PROCEDURES ———
4
29
4.10 REACTORS / FILTERS
In order to provide AC line protection from transients and high frequencies, it is necessary to insert a threephase
reactor on the AC input of the DV-300. The values here stated take into consideration the recommendation per
EN 60146-1-1, IEC 146-1-2, EN 61136-1.
The reactors can be provided by means of line reactors or an isolation transformer.
4.10.1 AC input choke
The type of the required AC input choke depends on
- the current absorbed by the AC input
- the AC input voltage
- the relative short circuit voltage
- the AC input frequency
The values stated in the following tables refer to a functioning with the connected converter rated current and
with a relative short circuit voltage of uk = 4 %. The saturation current of the reactors is 200% of the full load
current rating of the reactor.
In case of functioning with a motor having a rated current lower than the converter one it is possible to choose
the main reactor on the basis of the motor current stated on the AC input side (armature current x 0.82 x 1.05).
The reactor saturation current can also be calculated according the required motor overload.
Example: calculating the AC input choke
Motor: Va = 400V Ia = 80 A P = 29.4 kW Overload 150% Ia
Converter 6KDV3110Q2A.../Q4A...
AC input current: I
mains
= Ia · 0.82 · 1.05 = 80 · 0.82 · 1.05 = 68.9 A
AC input inductance:
0.04 . V
mains
3 . 2 . f . I
p
mains mains
0.04 . 400
3 . 2 . 50 . 68.9
p
L = = = 0.427 mH
Choke saturation
current:
I
sat
= 1.5 I
mains
= 103.3 A