Siemens SINAMICS S120 Configuration Manual page 36

Configuring
2.3 Selecting and dimensioning induction motors
Motor selection
Table 2- 1 The motor is selected depending on the cycle duration and the thermal time constant
Cycle duration
T/T ≤ 0.1 (cycle duration of 2 to 4 min)
th
0.1 ≤ T/T ≤ 0.5 (cycle duration of approx. 3 to approx. 20 min) A motor with the following rated torque M
th
T/T > 0.5 (for a cycle duration of approx. 15 min)
th
Selecting Motor Module
The required currents for overload are specified in the power-speed characteristics (powers
for S6-25 %, S6-40 %, S6-60 %). Intermediate values can be interpolated.
36
Motor selection
A motor with the following rated torque M
selected:
M > M and M
N rms max (cycle)
selected:
If, for duty cycles, torques occur above M
0.5 T , then a motor with the following rated torque
th
should be selected: M > M
N
Configuration Manual, (APH4S), 08/2008, 6SN1197-0AD64-0BP1
should be
N
< 2 M
N
should be
N
for longer than
N
.
max (cycle)
1PH4 Induction Motors