Siemens SIMOTICS S-1FK2 - Page 71

Duty cycles with constant ON duration
For duty cycles with constant ON duration, there are speci󹪝c requirements for the torque
characteristic curve as a function of the speed, for example:
M = constant, M ~ n
2
, M ~ n or P = constant.
PD[
W
W
9
3
3
˽
˽
Figure 5-2 S1 duty (continuous operation)
The drives with this load cycle typically operate at a stationary operating point.
Procedure
1. Con󹪝gure a base load for the stationary operating point. The base load torque must lie below
the S1 characteristic.
2. In the event of transient overloads (e.g. during acceleration), con󹪝gure an overload.
Calculate the overload current in relation to the required overload torque. The overload
torque must lie below the M_max characteristic.
In summary, the motor is con󹪝gured as follows:
5PSRVFJO/N
.PUPSTQFFEJOSNJO

4
.@NBY
.@LPOTU@Ü
.@LPOTU@(








M_max Curve of the maximum torque M_const_ov
er
Curve of the overload torque
S1 S1 characteristic M_const_ba
se
Curve of the base load torque
Figure 5-3 Motor selection for a duty cycle with constant switch-on duration
3. Select a motor that satis󹪝es the requirements of S1 duty.
Con󹪝guration
5.2 Con󹪝guring procedure
1FK2 Synchronous Motors for SINAMICS S120
Con󹪝guration Manual, 02/2022, A5E46927724B AD 69