Ramp-Function Generator Tracking - Siemens SINAMICS S120 Function Manual

Extended setpoint channel
4.5 Ramp-function generator
4.5.1

Ramp-function generator tracking

Overview
A ramp-function generator (RFG) can be operated with or without tracking.
Figure 4-10 Ramp-function generator tracking
Without ramp-function generator tracking
● p1145 = 0
● Drive accelerates until t2 although setpoint < actual value
With standard ramp-function generator tracking
● At p1145 > 1 (values between 0 and 1 are not applicable), ramp-function generator tracking
is activated when the torque limit is approached. The ramp-function generator output
thereby only exceeds the actual speed value by a deviation value that can be defined in
p1145.
● t1 and t2 almost identical
Note
Smaller motors
For smaller motors and depending on the controller settings required for the application there
may still be a greater deviation between the setpoint and the actual value. In this case any
sudden cancellation of the torque could result in a greater uncontrolled speed jump. By setting
the parameter p1400.16 = 1 the setpoint value becomes even more closely connected with the
actual value and the speed jump is reduced. With this parameter setting the integral component
of the speed controller is only stopped if it reaches the torque limit.
Function description
The following functions are available for RFG tracking:
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Function Manual, 06/2019, 6SL3097-5AB00-0BP2
Drive functions