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Rexroth IndraDrive
8.6
Peak Regenerated Power
DOK-INDRV*-HMV-*******-PR01-EN-P
Determination of Appropriate Power Supply Units
W
:
potential energy [Ws]
pot
m:
load mass [kg]
g:
gravity constant = 9,81 m/s²
h:
drop height [m]
z:
number of drops per cycle
Fig. 8-20:
Potential energy of non-compensated masses
W
=
P
RD
P
:
continuous regenerated power [kW]
RD
P
:
continuous bleeder power [kW]
BD
t
:
cycle time [s]
z
W
:
sum of potential energy [kWs]
potg
W
:
sum of rotary energies [kWs]
rotg
Fig. 8-21:
Continuous regenerated energy
The peak regenerated power usually arises, when an Emergency Stop
signal has been released and all the axes brake simultaneously.
Property damages due to longer braking
periods/paths!
⇒ Choose the power supply unit such that the sum of
the peak regenerated power of the all drives does not
CAUTION
exceed the bleeder peak power of the power supply
unit.
The peak regenerated power of the servo drives is listed in the motor
selection documentation.
Roughly estimated, the peak regenerated power can be calculated as
follows:
M
=
max
P
RS
9550
P
:
peak regenerated power [kW]
RS
P
:
peak bleeder power [kW]
BS
M
:
max. drive torque [Nm]
max
n
:
max. NC usable speed [min
max
1,25:
constant for motor and controller efficiency
Fig. 8-22:
Peak regenerated power
=
W
m
*
g
*
h
*
z
pot
+
W
potg
rotg
P
t
z
∑
*
n
max
*
, 1
25
-1
]
8-7
≤
P
RD
BD
≤
P
P
Rs
BS
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