P
mHa
Mechanical nominal power for main drives (shaft
output) [kW]
M
n
Nominal motor torque [Nm]
n
n
Nominal motor speed [min
-1
]
2. Determine DC bus power from motor power and efficiency
P
DC
Required DC bus continuous power [W]
M
eff
Effective torque in Nm
n
m
Average speed in min
-1
k Factor for motor and controller efficiency = 1.25
3. Add powers of all axes at common DC bus and put them into relation to
rated power of supply unit
⇒ Partial load of P
DC_cont
is available
4. Determine power factor TPF for partial load (TPF = Total Power Factor)
For the value TPF at rated power and TPF
10
(at 10% of rated power),
see technical data (mains voltage) of the component.
5. Calculate mains connected load
S
LN
Mains connected load [VA]
P
DC
DC bus continuous power [W]
TPF Total Power Factor λ
6. Calculate mains-side phase current
3-phase:
1-phase:
I
LN
Mains-side phase current in [A]
S
LN
Mains connected load [VA]
U
LN
Voltage between phases of mains [V]
7. Select mains contactor
8. Determine mains circuit breaker and line cross section
See chapter "Dimensioning the line cross sections and fuses " on page
87
Bosch Rexroth AG DOK-INDRV*-HCS01******-PR05-EN-P86/341
Rexroth IndraDrive CsDrive Systems with HCS01
Combining the individual components
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