Extended setpoint channel
3.6 Ramp-function generator
Drive functions
Function Manual, 11/2017, 6SL3097-4AB00-0BP5
79
Ramp-function generator tracking
A ramp-function generator (RFG) can be operated with or without tracking.
Figure 3-10 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 p
arameter 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.
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