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
Parameter Setting
p1091 Suppression speed 1
p1092 Suppression speed 2
p1093 Suppression speed 3
p1094 Suppression speed 4
p1101 Suppression speed bandwidth
p1080 Minimum speed
r1112 Speed setpoint after minimum limiting
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
Parameter Setting
p1082 Maximum speed, both directions of rotation
p1083 Speed limit in positive direction of rotation
p1086 Speed limit in negative direction of rotation
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
quality is improved.
Operation
8.5 Functions
SINAMICS SM150 6SL3845-2NN41-8AD2
Operating Instructions Rev.201910281310 EXAMPLE 101
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