Function block library
7-65
SHB9300CRV EN 2.0
7.6.15.5 Torque precontrol
With torque precontrol, the faster (inner)control circuits are activated earlier. It should beused if the
drive generates a contouring error during acceleration (negative or positive).
Stop!
The torque control has a much more sensitive influence on the drive than the speed precontrol.
Therefore, pleaseinfluencethedriveaccelerationwith the possibilities ofthespeed control first (see
above).
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The precontrol can be increased or decreased proportaionally to the speed change dn/dt via
the CCTRL-MRED.
– Values > 100% have the effect of a gain on the precontrol.If the values are too high, the
drive operates too fast in dynamic processes or becomes instable.
– Values < 100% have a damping effect on the precontrol. If the gain is not high enough, a
contouring error (drive too slow) will occur during acceleration or deceleration of the drive.
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With codes C1348/1 (numerator) and C1348/2 (denominator), the precontrol can be adapted
to the inertia of the machine.
Note!
The input value at CCTRL-MRED is processed further as absolute value, i.e. neg. values are
interpreted as being positive.
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