WEG CFW-11M RB, Руководство пользователя

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3
3-10 | CFW-11M RB
Installation and Connection
KA1 K1 KA2
21
NC
K(PCR)
K1
A
B
C
R
S
T
CFW11M RB
converter
Filter
Synchronism
Pre-charge
+UD
-UD
R
R
R
RT1 Stop
220 VAC
external
S
OFF
S
ON
KA1
KA1
KA2
XC1:23CC11 RB (D01)
PCR
NO
C 22
KA2
KA2
K(PCR)
K(PCR)
RT1
Figure 3.13 -
Pre-charge circuit example
A contactor or a motorized circuit breaker can be installed at the input of the CFW11RB (represented by K1)
and its command must be interlocked with the pre-charge contactor K(PCR) command. Figure 3.13 presents
an example of the recommended pre-charge circuit for the CFW-11M RB converter with simplified power and
command diagrams. There is already a relay (D01) configured as “Pre-charge OK” function in the CC11 RB board
(refer to table 3.6). This relay must be used to command the pre-charge contactor and the main contactor
(motorized circuit breaker). Furthermore, the pre-charge timing must be set for the protection of the auxiliary
circuit (resistors, rectifier bridge). This function is carried out by a timer relay with a normally-closed on-delay
contact, represented as RT1 in the figure 3.13
3.4.2 Bus Bars
The panel bus bars must be sized according to the input and output current of the converter. It is recommend
the use of copper bars. In case that aluminum bars have to be used, it is necessary to clean the contacts
and to apply an antioxidant compound. If the compound is not used, any copper-aluminum junction will
suffer an accelerated oxidation.
3.4.3 DC Link Fuses
It is recommended the use of fuses suitable for operation with direct current at the UP11 DC output. The
maximum bus voltage (IGBT overvoltage trip level) is 800 Vdc for the 400 V converter line and 1200 Vdc
for the other converter lines. The fuses used in AC lines can be used; however, a derating in the AC voltage
must be applied. Consult the fuse manufacturer in order to obtain the derating factor.
Fuse examples:
- 400 V line: 12,5URD73TTF900 (FERRAZ)
- Other lines: 12,5URD73TTF630 (FERRAZ)