Calculation Of The Required Dc Link Power (Pzk) For Dimensioning; The Supply System, Infeed Unit - Siemens SIMODRIVE 611 digital Configuration Manual

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05.01 02.07
1.3.1
© Siemens AG 2008 All Rights Reserved
SIMODRIVE 611 Configuration Manual (PJU) – 05/2008 Edition
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Calculation of the required DC link power (P

the supply system, infeed unit

Steady–state operation:
P = P
ZK VSA ZK
P v Pn
ZK infeed module
S
Feed axes with rotary motors
The following formula is used in the engineering sheet to determine the cal-
culated power:
= 0.105 ⋅ M
P
calc FD
Where:
P
calc FD
0.105
For feed axes, calculated with M
M
0
n
n
S
Feed axes with linear motors
⋅ V
P = F
n MAX, FN
Where:
F
n
V
MAX, Fn
The DC link power P
sheet. The following factors must be taken into account:
S
Speed ratio ñ/n
S
Coincidence factor K for the number of feed axes per area
If the exact values of the speed ratio ñ/n
for the application in question, these should be used.
S
Main spindles
For main spindle drives, the efficiencies must be included in the calculation
and are roughly estimated using the following factors:
– Motors
P
MSD ZK
– Motors
P
MSD ZK
Where:
P
MSD ZK
1.45 or 1.25
P
motor shaft MSD
The rated motor current may not exceed the rated output current of the
power modules. The maximum motor current must always be less than the
maximum converter current.
sales@aotewell.com
+ P
MSD ZK
–3
⋅ n ⋅ 10
[kW]
0 n
calculated power for feed axes [kW]
factor 2 ⋅ π/60
0
stall torque [Nm]
rated speed [RPM]
⋅ 10 –3
[kW]
rated force [N]
maximum velocity at the rated force [m/min]
of the feed axes is calculated using the engineering
VSA ZK
N
and coincidence factor K are known
N
v 4 kW
+ 1.45 ⋅ P
MSD motor shaft
u 4 kW
+ 1.25 ⋅ P
MSD motor shaft
DC link power for the main spindle drive [kW]
Assumed factor for the motor efficiency
mechanical power [kW] used at the shaft of the
main spindle motor
Industry Automation
1 Overview of the Drive System
1.3 Engineering a drive
) for dimensioning
ZK
[kW]
[kW]
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