DC-bus fuse specification
The fuse rating depends on the fuse type (gG) and the temporary overload capa-
bility of the frequency converter.
If no overload happens in an application, the fuses can be selected
directly according to the power rating of the frequency converter.
Recommended fuse ratings at DC-bus voltage of 513 V are shown in the table
below.
Model Motor power [kW] Motor efficiency DC-current [A] gG fuses [A]
5K50 5.5 85.8 % 12.5 16
7K50 7.5 87.1 % 16.8 25
11K0 11.0 88.5 % 24.2 35
15K0 15.0 89.5 % 32.7 50
18K5 18.5 90.1 % 40.0 50
22K0 22.0 90.6 % 52.7 63
30K0 30.0 91.5 % 71.1 80
37K0 37.0 92.1 % 87.1 100
45K0 45.0 92.6% 94.7 175
55K0 55.0 93.1% 115.2 200
75K0 75.0 93.7% 156.0 250
90K0 90.0 94.0% 186.6 300
Tab. 8-8: Recommended fuse ratings
I
DC
= P
Motor
/ (V
DC
x η
Motor
)
V
DC
= 1.35 x V
in
V
in
is the RMS value of the AC input voltage.
For example, if V
DC
= 513 V, the equivalent V
in
= 380 V.
The recommended fuse rated current is calculated based on the selected motor.
In actual application, please check the value according to the equation above
and the actual motor efficiency.
EFC x610 Series
Bosch Rexroth AG
Frequency Converter Wiring
DOK-RCON03-EFC-X610***-IT05-EN-P
53/389
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