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on age or thermal factors, a broader control range should be blocked. To ensure that the speed
does not constantly increase and decrease in the suppression bandwidth (speeds), the bands
are assigned a hysteresis.
Specify a minimum speed in order to block a specific range around the stopped state for
stationary operation.
Table 8-2
Parameter
p1091
p1092
p1093
p1094
p1101
p1080
r1112
You can find additional information in function diagrams 1550 and 3050.
Speed limitation
The speed limitation is used to limit the maximum permitted speed for the complete drive train.
The drive and the load machine / process are protected from damage caused by overspeed.
Table 8-3
Parameter
p1082
p1083
p1086
You can find additional information in function diagrams 1550 and 3050.
Ramp-function generator
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. Parameter p1115 can be used to select two ramp-function generators.
To improve the control properties with regard to load surges, set additional rounding times in
the lower and upper speed range.
The rounding times achieve the following:
● They protect mechanical components, such as shafts and couplings.
● The overshoot of the actual speed while approaching the setpoint is avoided. The control
SINAMICS SM150 6SL3845-2NN41-8AD2
Operating Instructions Rev.201910281310 EXAMPLE
Parameter
Setting
Suppression speed 1
Suppression speed 2
Suppression speed 3
Suppression speed 4
Suppression speed bandwidth
Minimum speed
Speed setpoint after minimum limiting
Parameter
Setting
Maximum speed, both directions of rotation
Speed limit in positive direction of rotation
Speed limit in negative direction of rotation
quality is improved.
Operation
8.5 Functions
101
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