Siemens SIMOTICS 1FT2104-4AF - Page 64

Configuration
5.2 Configuring procedure
1FT2 synchronous motors for SINAMICS S120
62 Configuration Manual, 03/2021, A5E50645584B AA
Duty cycles with constant ON duration
For duty cycles with constant ON duration, there are specific 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. Configure 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), configure 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 configured as follows:
M_max
Curve of the maximum torque
M_const_over
Curve of the overload torque
S1
S1 characteristic
M_const_base
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 satisfies the requirements of S1 duty.
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