M
a
Motor a M
b
Motor b
Fig. 8-7: Wiring of DC-bus in parallel
Conditions for DC-bus in parallel
● In the above typical application, FC
b
runs in generation mode and FC
a
runs in
motor mode. The power rating of FC
a
needs to be 3 levels higher than that of
FC
b
.
E.g., FC
b
is 7K50, FC
a
needs to be 18K5 (11K0 and 15K0 in between)
● DC-bus voltage is within the specified range: 457...745 V.
● Use mains choke.
● Select fuses according to FC
b
which runs in generator mode, see chapter "DC-
bus fuse specification" on page 53.
● Use external brake resistor to keep the DC-bus voltage within the normal
range, especially when converter a is running with light load instead of full
load.
● Switch on mains supply to the frequency converters first, and then close MC
a
and MC
b
after the LED display is active with both frequency converters. The
contactor MC
a
and MC
b
will be switched off by the respective relay output of
the frequency converter when an error happens to any of the two frequency
converters.
– Select contactors according to the current ratings in chapter "DC-bus fuse
specification" on page 53.
– Connect the relay output of FC
a
to MC
a
, FC
b
to MC
b
.
– Set [E2.15] = '14: Converter error' to control MC
a
by relay output of FC
a
.
– Set [E2.15] = '14: Converter error' to control MC
b
by relay output of FC
b
.
By default, the relay output in inactive when the frequency converter
is not running.
Bosch Rexroth AG
Frequency Converter Wiring
EFC x610 Series
50/389
DOK-RCON03-EFC-X610***-IT05-EN-P
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