Setpoint Calculation; Minimum Speed And Maximum Speed - Siemens SINAMICS G120 Operating Instructions Manual

8.5

Setpoint calculation

The setpoint processing modifies the speed setpoint, e.g. it limits the setpoint to a maximum
and minimum value and using the ramp-function generator prevents the motor from
executing speed steps.
Figure 8-10
8.5.1

Minimum speed and maximum speed

The speed setpoint is limited by both the minimum and maximum speed.
When the motor is switched on, it accelerates to the minimum speed regardless of the speed
setpoint. The set parameter value applies to both directions of rotation. Beyond its limiting
function, the minimum speed serves as a reference value for a series of monitoring
functions.
The speed setpoint is limited to the maximum speed in both directions of rotation. The
inverter generates a message (fault or alarm) when the maximum speed is exceeded.
The maximum speed also acts as an important reference value for various functions (e.g. the
ramp-function generator).
Table 8- 21
Parameter
P1080
P1082
SINAMICS G120C Inverter
Operating Instructions, 01/2011, FW 4.4, A5E02999804A AB
Setpoint processing in the inverter
Parameters for minimum and maximum speed
Description
Minimum speed
Maximum speed
Functions
8.5 Setpoint calculation
181