WEG CFW-11W G2 RB Series User Manual page 42

E.g.:
In a drive consisting of three regenerative power units plus three output power units whose line voltage at the
converter input is 690 Vrms (UP11-01 G2), the values obtained will be as follows:
Energy stored in the capacitor bank: 3 x 0.012 x 690
„
Using three 3 Ω resistors (one per phase), each resistor must withstand 5,713.2 J.
„
The manufacturer of the resistor can inform the energy the component withstands.
„
The peak current during the pre-charge will be 188.6 A and the pre-charge duration will be 0.9 s.
„
QPCR
K1
Mains
220 Vac
external
(*) If only one power unit is used at the output, it is not necessary to use fuses on the DC Link.
Table 3.16: Maximum pre-charge resistor value for the CFW11W G2 RB
N° of UP11Ws
1
2
3
4
5
KPCR
R
Filter
KSINC
QSINC
11
KT1
Stop
18
12
11
KA1
S
OFF
12
CC11 (DO1)
13 13
XC123
S
ON
14 14
KPCR
A1 A1
KA1 KT1 KA2
+RC
A2 A2
Figure 3.28: Example of a pre-charge activation circuit
Installation and Connection
500-690 V
5.5 Ω
3.0 Ω
2.0 Ω
1.4 Ω
1.2 Ω
= 17x139.6 J.
2
CFW11M G2 RB
or
CFW11W G2 RB
AC DC
Fuses Fuses
U DC+
V
W DC-
Synchronism
15 13 43
KA2 KA2
16 14 44
18
44
XC122
XC1:21
21 21
KA2
22 22
A1 A1 A1
KPCR K1
+RC +RC +RC
A2 A2 A2
CFW11M G2
or
CFW11W G2
(*)
DC+ U
V
DC- W
A1
KSINC
+RC
A2
CFW-11MW G2 RB | 3-23
3
Motor