ZIEHL-ABEGG ZETADYN 1DV Series, Описание системы

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Control and controller functions 17
3.2.3 Distance-controlled deceleration - Arch travel
In case of decelerating runs, the path dependent
deceleration is carried out by the driving
commands V3 and V2 according to the
positioning speed V1.
To do this, the parameter
/INSTALLATION/
S_ABH
has to be
ON
(factory setting).
In case of all other change-overs between speed
presettings the running curve is carried out
depending on the time.
Advantages:
The path dependent deceleration offers
advantages if the final speed (V3 resp. V2)
cannot be achieved in case of runs between
stops that are close together.
In such a case, the control device carries out an
arch travel.
The control device provides for continuous
rat runs and the shortest possible cycle
times
(see illustration 3.4),
independent from
the speed achieved at the decelerating point
(4)
.
Functioning:
If the final speed set (Figure 3.4) has not yet
been reached at the decelerating point (4), the
drive continues to accelerate.
The control device determines the point X from
which the deceleration has to be initiated in
order to reach the stop with the positioning
speed V1. Now the control device rounds out the
running curve and decelerates by means of the
deceleration A_NEG set.
Because of that, in case of the ARCH TRAVEL
and the NORMAL TRAVEL, the decelerating
distances S_31(4 -> 5) and the rat runs s_1
(5 ->6) are the same.
Figure 3.4 Comparison normal travel and arch travel
Control:
The control has to feed the driving command V1
prior to the removal of the driving command V3
(resp. V2).
Side-effects:
In case of controls showing a signal running time
of more than 10 ms, it is possible that the rat run
for ARCH travel is no longer the same as for
NORMAL travel. In addition there is a small error
with the total decelerating distances measured
(S_30, S_20).
The controller is able to compensate this error in
case of an almost constant signal operation
time. To do this, the signal operation time has to
be entered in /INSTALLATION/T_SIG at
commissioning.
V
inputs
V3
4
V 1
V3
V1
V
inputs
V1
V3
V1
4
V3
NORMAL TRAVEL: V3 is switch off during constant travel.
ARCH TRAVEL: V3 is switch off during the accelaration.
t
5 6
t
5 6
S_31
S_31
X