Siemens CU240S DP-F - Page 253

Functions
8.12 PID Controller
Control Units CU240S
Operating Instructions, 11/2006, A5E00766042B AA
8-57
Using the PID dancer roll control, with SINAMICS G120 it is possible to ensure that
continuous material webs have a constant tension.
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Figure 8-38 PID dancer roll control
The velocity v
1
is assumed to be an independent disturbance; the input velocity v
2
should be
controlled using motor rolls A
2
so that the length x
2
of the loop corresponds, as far as
possible, to the setpoint.
Note
When selecting the closed-loop dancer roll control it should be noted that neither PID-MOP
nor PID-FF should be used - but instead the MOP (motorized potentiometer) or the FF (fixed
frequencies).
The structure and important parameters for the PID dancer roll control are shown below.
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Figure 8-39 Structure of the closed-loop PID-dancer roll control