Rexroth IndraDrive Calculations 15-7
DOK-INDRV*-SYSTEM*****-PR02-EN-P
The additional capacitor has to be dimensioned in such a way that it can
store the rotary drive energy:
()
DC
22
On R_DC
2
C
UU
W
C
DC
rot
DCext
−
−
≥
U
R_DC On
: braking resistor switch-on threshold
U
DC
: DC bus voltage
W
rot
: rotary energy [Ws]
C
DC
: internal capacitance [F]
C
DCext
: required external DC bus capacitance [F]
Fig. 15-19: Required additional capacitance [F]
CAUTION
Property damage caused by overload of HMV
and HCS devices!
⇒
Comply with max. allowed external DC bus
capacitance! See electrical data of the HMV and
HCS components.
CAUTION
Property damage caused by overload of the
additional external capacitors!
⇒
Use allowed components for drive system
Rexroth IndraDrive.
⇒
The properties of the additional capacitors have to
comply with minimum requirements:
min.
dielectric strength: DC900V
min.
current load capacity: 15A
eff
/ mF
min.
heat resistance: 105°C
max.
discharge time: 30 min
Take measures against flammability in case of
overload, e.g. by housing the capacitors.
⇒
Connect correct polarity: Connect L+ to positive
pole and L- to negative pole of the additional
capacitors.
Note: We recommend that you dimension the additional capacitors
at the DC bus for 10% overvoltage at the mains connection.
Note: As the supply voltage increases the storable energy in the DC
bus decreases, as the differential voltage between braking
resistor threshold U
B
and DC bus voltage U
ZW
(crest value of
supply voltage) is reduced.
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