Duty cycles with constant ON duration
For duty cycles with constant ON duration, there are specic requirements for the torque
characteristic curve as a function of the speed, for example:
M = constant, M ~ n
2
, M ~ n or P = constant.
Figure 5-2 S1 duty (continuous operation)
The drives with this load cycle typically operate at a stationary operating point.
Procedure
1. Congure 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), congure 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 congured as follows:
5PSRVFJO/N
.PUPSTQFFEJOSNJO
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 satises the requirements of S1 duty.
Conguration
5.2 Conguring procedure
1FK2 Synchronous Motors for SINAMICS S120
Conguration Manual, 02/2022, A5E46927724B AD 69
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