Conditions for DC-bus with external DC power supply
● DC-bus voltage is within the specified range: 457...745 V.
● Use mains choke.
● Select fuses according to chapter "DC-bus fuse specification" on page 53.
● Use the relay output of the frequency converter to control the contactor MC
of the DC-bus. The contactor will be switched off by the relay output once the
frequency converter encounters an error.
● For 5K50...22K0 models, select the external softstart resistor according to the
allowed maximum charging current defined in the table below.
Model Maximum charging current [A]
5K50 25
7K50 35
11K0 50
15K0 75
18K5 100
22K0 150
30K0
–
①
37K0
–
①
Tab. 8-7: Allowed maximum charging current
①
: 30K0 and above models do not need external softstart resistor.
● Set [E2.15] = '14: Converter error' to control MC by relay output of FC. Con-
nect relay output of FC to MC.
By default, the relay output is inactive when there is no error. Please
use an additional device to keep the relay output status when the
frequency converter is switched off without power input. Without
such a device, the relay output will be restored to be inactive as the
frequency converter will lose the control.
The external softstart circuit must be properly controlled to avoid direct charg-
ing of the capacitor with external DC power supply, especially when DC power
supply is the only power source for the frequency converter.
● Use a diode to ensure the current is always in the direction of flowing-in the
frequency converter.
Bosch Rexroth AG
Frequency Converter Wiring
EFC x610 Series
52/389
DOK-RCON03-EFC-X610***-IT05-EN-P
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