Specifying The Duty Cycle - Siemens SIMOTICS M 1PH8 Configuration Manual

Configuration
6.2 Procedure when engineering
The following operating scenarios have been defined:
• Duty cycle with constant ON period.
• Duty cycles with varying ON period.
• Free duty cycle.
The objective is to identify characteristic torque and speed operating points that can be used
as a basis for selecting the motor depending on the load.
6.2.2

Specifying the duty cycle

Duty cycles with constant ON period
For duty cycles with constant ON period, there are specific requirements for the torque
characteristic curve as a function of the speed, for example:
M = constant, M ~ n
Figure 6-1
These drives typically operate at a specific operating point. Drives such as these are
dimensioned for a base load. The base load torque must lie below the S1 characteristic
curve. An overload rating is provided for transient overloads (e.g. during acceleration). The
overload current must be calculated relative to the required overload torque. The peak torque
must lie below the voltage limiting characteristic.
206
, M ~ n or P = constant.
2
S1 duty (continuous operation)
1PH8 SIMOTICS M main motors
Configuration Manual, 12/2022, A5E51895839A