Siemens SINAMICS S120 System Manual page 152

Configuring
10.1 Features
Calculating the maximum speed for synchronous and induction motors
Table 10- 2 Overview of parameters to calculate the speed
Parameter Meaning
r0297 Overvoltage threshold DC link 820 V
p0233 Filter inductance, 0.036 mH
p0234 Filter capacitance [µF]
16 kHz
32 kHz
p0304 Rated motor voltage [V]
p0310 Rated motor frequency [Hz]
p0311 Rated motor speed [rpm]
p0314 Motor pole pair number
Synchronous motor:
Induction motor:
p0315 Motor pole pair width [mm]
p0316 Motor torque constant, rotary [Nm/A]
Motor force constant, linear [N/A]
p0317 Motor voltage constant [V]
p0348 Speed at the start of field weakening [rpm] for V
p0353 Motor series inductance [mH]
p0356 Motor stator leakage inductance [mH]
p0358 Motor rotor leakage inductance [mH]
p0360 Motor magnetizing inductance [mH]
Motor leakage inductance / armature inductance (incl. series inductance, if applicable)
Synchronous motor:
Induction motor:
The pole pair number for induction motors corresponds to the numbers in front of the decimal place of the calculated
1)
parameter.
The maximum motor speed for synchronous and induction motors can be calculated with the
following formulas. Here, the parameters should be used in the units listed in the tables
above.
152
Without additional capacitance
11.9 µF
2.72 µF
On the rating plate
p0314 = (p0310 [Hz] • 60) / p0311 [rpm]
= 600 V (425 V
dc
L_motor [mH] = p0356 + p0353
L_motor [mH] = p0356 + p0360 - p0360
With additional capacitance
15.2 µF
3.4 µF
1)
/ p0317 · 1000 rpm)
rms
/ (p0360 + p0358) + p0353
2
System Manual, (SH2), 04/2015, 6SL3097-4AH10-0BP3
High Frequency Drive