GEFRAN-SIEI ARTDrive Vector V2 Series - Page 70

70 • Chapter 4 Wiring Procedure ARTDrive V2 series - Instruction Manual
AVy... (230...480Vac)
Figure 4.9.1-A: Buffering the Regulator Supply by Means of Additional Intermediate
Circuit Capacitors (for 230...480Vac)
3Ph~
PE1 /
U1/L1
V1/L2
W1/L3
BR1
U2/T1
V2/T2
W2/T3
C
D
PE2/
F1
1
C
x
1
C1
x
1
C2
x
=+
C 1000 V
DC
or
X
R1c
47kohm
5W
R2c
47kohm
5W
R3c
47kohm
5W
C1x
400V
C2x
400 V
DC
DC
DC
C3x
400 V
1
C3
x
+
NOTE! When connecting the intermediate circuit terminals C and D the AC Input side
must be protected with superfast semiconductor fuses!
Formula for calculating the size of the external capacitors:
C ext =
2P SMPS t Buff 10
6
U
2
Buff
-U
2
min
-C std
C
ext
, C
std
[μF]
P
SMPS
[W] U
Buff
= 400 V at U
LN
= 400 V
t
Buff
[s] U
Buff
= 460 V at U
LN
= 460 V
U
Buff
, U
min
[V] U
min
= 250 V
Calculation example
An AVy4220 Drive is operated with an AC Input supply U
LN
= 400 V.
A voltage failure buffer is required for max. 1.5 s.
P
SMPS
70 W t
Buff
1.5 s
U
Buff
400 V U
min
250 V
C
std
1800 μF
C ext =
(400 V)
2
- (250 V)
2
- 1800 µµµµF = 2154 F - 1800 F = 354 F
2 70 W 1.5 s 10
6
µF/F