Rexroth IndraDrive
Determination of Appropriate Power Supply Units
8-5
DOK-INDRV*-HMV-*******-PR01-EN-P
8.4 Regenerated
Energy
The energy content of all main and servo drives that brake simultaneously
under unfavorable conditions may not be greater than the maximum
regenerated energy of the power supply unit as specified in the data
sheet. If this is not taken into consideration during the layout stage, then
there could be thermal damage to the bleeder resistor in the power supply
unit!
CAUTION
Property damages due to overloaded bleeder
resistor!
⇒
Use a power supply unit that is appropriate for the
consumption of the regenerated power which arises
when all the main and servo drives connected to the
power supply unit brake simultaneously.
2
eil
G
rot
60
2
*
n
*
2
J
W
π
=
W
rot
:
rotary energy [Ws]
n
eil
:
rapid traverse speed [min
-1
]
J
G
:
inertia of motor and load inertia reduced to shaft [kgm²]
Fig. 8-14:
Regenerated energy per drive
∑
≤
MAX
rot
W
W
W
rot
:
rotary energy [Ws]
W
MAX
:
max. permissible regenerated energy of the power supply module
[kWs]
Fig. 8-15:
Sum of regenerated energies
In servo drive applications with numerous accel and decel procedures, as
is the case, for example, with nibble machines and rollers, it is advisable
to connect additional capacitors to the DC bus. The following advantages
result from this:
•
This prevents the bleeder resistor in the HMV01.1E power supply unit
from being actuated while braking: The heat dissipated within the
control cabinet is considerably reduced.
•
The stored energy can be used to accelerate thus reducing energy
requirements of the installation.
(
)
2
ZW
2
B
ZW
ZW
U
U
*
2
C
W
−
=
W
ZW
:
energy stored in the DC bus
C
ZW
:
DC bus capacitor [F]
U
B
:
bleeder actuation threshold
U
ZW
:
DC bus nominal voltage
Fig. 8-16:
Energy that can be stored in the DC bus
Auxiliary capacitance as energy
storage in the HMV01.1E
Summary of Contents for Rexroth IndraDrive HMV01.1E-W0030
Page 30: ...5 2 Transport and Storage Rexroth IndraDrive DOK INDRV HMV PR01 EN P Notes ...
Page 40: ...6 10 Mechanical Mounting Rexroth IndraDrive DOK INDRV HMV PR01 EN P Notes ...
Page 88: ...9 8 Control Mains Contactor Rexroth IndraDrive DOK INDRV HMV PR01 EN P Notes ...
Page 122: ...13 22 Appendix Rexroth IndraDrive DOK INDRV HMV PR01 EN P Fig 13 25 HFD01 2 480 0026 ...
Page 123: ...Rexroth IndraDrive Appendix 13 23 DOK INDRV HMV PR01 EN P Fig 13 26 HFD02 2 480 0026 ...
Page 130: ...14 6 Index Rexroth IndraDrive DOK INDRV HMV PR01 EN P Notes ...
Page 131: ......
