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Operation
8.5 Functions
Parameter
p1075
p1076
r1077
r1078
These parameters concern connector inputs to which the setpoint values are connected.
Function diagram
FP 3030
Direction reversal
A reversal of the rotational direction is necessary under the following conditions:
● When the drive should be operated in both directions of rotation.
● If the cables were connected with an incorrect phase sequence.
Note
Note that only one direction of rotation is enabled in the factory setting.
To subsequently reverse the phase sequence, you must interchange the motor cables or enter
a negative setpoint. A direction reversal cannot be achieved with parameter settings. Direction
of rotation changeover is initiated as follows:
● Controlled via PROFIBUS using control word 1, bit 11
● Controlled from the cabinet operator panel ("LOCAL mode" function) with the "direction of
Table 8-1
Parameter
p1110
p1111
p1113
For further information, see the function diagram 3040.
Skip frequency bands and minimum speed
Variable-speed drives can generate critical whirling speeds within the control range of the
entire drive train. This prevents steady-state operation in their proximity, that is,
the range of critical whirling speeds can still be passed through. The drive, however, must not
remain here because this can cause excitation of the sympathetic oscillations.
The suppression bandwidths allow this range to be blocked for steady-state operation.
Because the points at which critical whirling speeds occur in a drive train can vary depending
100
Setting
Supplementary setpoint
Supplementary setpoint scaling
Supplementary setpoint effective
Total setpoint effective
rotation changeover" key.
Parameter
Setting
Inhibit negative direction
Inhibit positive direction
Direction of rotation reversal
SINAMICS SM150 6SL3845-2NN41-8AD2
Operating Instructions Rev.201910281310 EXAMPLE
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