ABB DCS550 - Accactadjust (Acceleration Adjustment); Tensionref (Tension Reference); Tenstotorq (Tension to Torque)

136
Winder
3ADW000379R0501 DCS550 Manual e e
AccActAdjust (acceleration adjust
ment)
The ac
tual acceleration adjustment filters e.g. the dv_dt (2.16) output of the ramp
with a PT1
-filter. This filter is always active. The output has to be 100 % with
maximum acceleration using the shortest ramp time. To achi
eve this goal a trimming
input is avail
able.
Commissioning hints:
−
AccTrim (62.19) has to be determined with acceleration trials. AccActAdjust
(62.21) has to be 100 % with maximum acceleration using the shortest ramp
time.
−
Autotuning is possible with WinderTuning (61.21) = InerMechComp.
TensionRef (tension reference)
The tension reference block contains four functions.
1.
By means of the tension reference, it is possible to force or preset the tension set
point.
2.
Tension reference is limited by a minimum and then passed through a ramp with
hold function to prevent tension steps.
3.
If the friction is very high, a start tension pulse is helpful to break away the
machine. The width, amplitude and release of the start impulse can be set via
parameters.
4.
Use the taper function to reduce the tension depending on an
increasing diameter. The reduction of the tension begins with
diameters over the taper diameter and ends at the maximum
diameter. Following formula is valid at the maximum diameter:
)06.63(TaperTensTensionTension
InputOutput
−=
TensToTorq (tension to torque)
For winders it is important that the tension fit to the web. With too low tension, the
web does not wind correctly. With too high tension, the web might rip. This is the
worst case, because the
winder will accelerate, if there is no web break monitoring.
The tension is a force measured in Newton [N]. When the tension is multiplied by the
radius of the coil, the necessary torque for the selected tension can be calculated.
Most torque is needed wit
h maximum diameter at lowest motor speed. This winder
block features 3 tension inputs and 1 torque output.
i
DF
T
*2
*
=
T [Nm]
torque
F [N]
tension
D [m]
diameter
i
gear ratio (motor / load)
TaperDia (63.05) Max. diameter (= 100 %)
TaperTens (63.06)
63.06>0
63.06<0
TaperDia (63.05) Max. diameter (= 100 %)
TaperTens (63.06)
TaperDia (63.05) Max. diameter (= 100 %)
TaperTens (63.06)
63.06>0
63.06<0
F
T
D
F
T
D