Siemens SINAMICS G130 - Ramp-Function Generator

Setpoint channel and closed-loop control
7.2 Setpoint channel
Inverter chassis units
324 Operating Instructions, 07/2016, A5E00331449A
Function diagram
FP 3050
Skip frequency bands and speed limiting
Parameter
•
p1082
Maximum speed
•
p1083
CO: Speed limit in positive direction of rotation
•
r1084
CO: Speed limit positive effective
•
p1085
CI: Speed limit in positive direction of rotation
•
p1086
CO: Speed limit in negative direction of rotation
•
r1087
CO: Speed limit negative effective
•
p1088
CI: Speed limit in negative direction of rotation
•
r1119
CO: Ramp
-function generator setpoint at the input
7.2.5
Ramp-function generator
Description
The ramp-function generator limits the rate at which the setpoint changes when the drive is
accelerating or decelerating. This prevents excessive setpoint step changes from damaging
the drive train. Additional rounding times can also be set in the lower and upper speed
ranges to improve control quality and prevent load surges, thereby protecting mechanical
components, such as shafts and couplings.
The ramp-up and ramp-down times each refer to the maximum speed (p1082). The rounding
times that can be set can prevent the actual speed value from being overshot when the
setpoint is approached, thereby improving control quality.
When final rounding set, a sudden reduction of the setpoint when ramping up can cause the
setpoint to overshoot, if continuous smoothing has been selected via p1134 = 0. The larger
the selected final rounding time, the larger the overshoot.
Rounding is also effective in the zero crossover; in other words, when the direction is
reversed, the ramp-function generator output is reduced to zero via initial rounding, the
ramp-down time, and final rounding before the new, inverted setpoint is approached via
initial rounding, the ramp-up time, and final rounding. Rounding times that can be set
separately are active in the event of a fast stop (OFF3). The actual ramp-up/ramp-down
times increase with active rounding.
The rounding type can be set using p1134 and separately activated/deactivated using
p1151.0 in the zero point.