POSICON positioning control – Supplementary manual for series SK 200E and SK 250E-FDS
54 BU 0210 en-3117
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4.9.8.1 Determination of acceleration path and initiator position
The distance of the initiator from the point at which the sawing process is to begin corresponds to
double the value of the acceleration path for the saw drive (slave). During the acceleration process the
belt drive (master) travels back for double the distance of the saw drive (slave).
For the calculation of the initiator position the corresponding speed ratios between the drive units and
gearing factors must be taken into account. The minimum acceleration path must be entered in
P613 [-63].
Calculation of the minimum acceleration path
Slave_max
Acceleration Time
T
Acceleration Time
= P102 * F
Slave_max
/ P105
n
Slave_max
= F
Slave_max
/ Number of pole pairs
P608 [-xx] / P607 [-xx] = (R
Gear Unit Slave
* D
Master
) / (R
Gear Unit Master
* D
Slave
)
INI
Slave
Gear Unit Slave
n = Speed [rpm]
T = Time [s]
D = Diameter of gear unit output
∆P
INI
= Minimum distance to initiator
If the set acceleration path is smaller than that which is necessary, the error message E13.5 "Flying
saw acceleration" is triggered. A check is also made as to whether the sign of the acceleration path
matches the sign of the master speed. If this is not the case, the error message E13.6 "Flying saw
value false" is triggered after the start command is activated.
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