Rexroth IndraDrive Calculations 15-5
DOK-INDRV*-SYSTEM*****-PR02-EN-P
9550
25,1*n*)MM(
P
eilGNC
ZWS
±
=
1,25: constant for motor and controller efficiency
M
NC
: acceleration torque in the drive [Nm]
M
G
: torque due to weight for vertical axes [Nm]
n
eil
: speed at rapid traverse rate [min
-1
]
P
ZWS
: DC bus peak power [kW]
Fig. 15-13: DC bus peak power per drive
∑∑
≤ devicesZWS,oninstallatiZWS, PP
PZWS,installation: generated DC bus peak power of the installation
P
ZWS,devices: allowed DC bus peak power of the devices
Fig. 15-14: Supply condition: DC bus peak power
Regenerative Power
When all main and servo drives connected to a drive controller or
combination of drive controllers brake simultaneously, the generated
regenerative power must not be greater than the maximum regenerative
power of the drive controller or combination of drive controllers. If this is
not taken into consideration in dimensioning the system, thermal
destruction of the braking resistors in the drive controllers may occur.
CAUTION
Risk of damages due to braking resistor
overload!
⇒
Only use a drive controller or combination of drive
controllers that can absorb the resulting regenerative
power generated when all main and servo drives
connected to the drive controller or combination of
drive controllers brake simultaneously.
2
eil
G
rot
60
2
*n*
2
J
W
π
=
W
rot
: rotary energy [Ws]
n
eil
: speed at rapid traverse rate [min
-1
]
J
G
: motor inertia and load inertia reduced to the motor shaft [kgm
2
]
Fig. 15-15: Regenerative power per drive
∑∑
≤ devicesR,oninstallatiR, WW
WR,installation: generated regenerative power of the installation
W
R,devices: allowed regenerative power of the devices
Fig. 15-16: Supply condition: regenerative power
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