Parker Hannifin S.p.A Divisione S.B.C. user’s manual TWIN-N and SPD-N
93
7.5.2.1 Automatic activation of CAM tables
Beside enabling tables on programmable master phase or by immediate command as shown
above, the drive offers a default function providing for an automatic sequence to enable the
tables in order to concur some functionalities like engage and disengage cam, with connection
tables.
The operation is enabled through the activation of bit b180.15=1 and by using bit 181.4
command in order to start sequence Tab0 and bit 231.14 command in order to start per a
disengaging sequence. The switch between active tables always occurs during master phase 0.
Tab1 and Tab2 are used as a link during the switch between Tab0 and Tab3 and the other way
round, and therefore they cannot be active longer than one master module.
As shown in the figures, the table switching sequence is automatically inverted when the
speed is negative.
The above-described function is essential, for instance, in applications where the user wants to
complete an engage/disengage phase starting from a gearing function (Electrical axis) by
means of linear linking ramps.
By linear links we mean the tables describing the two engage and disengage ramps. Let’s
suppose that Tab0 has been programmed with a y=x function (gearing) and that Tab3 has
been programmed as a fixed axis, that is y=constant K. We will need to calculate both linking
tables in Tab1 and Tab2 to be able to engage and disengage the axis.
If we consider, for instance, the master cycle in a module in degrees (360°), we will have to
set in Pr105 the master module sector value (ranging between 0° and 360°) that we are going
to use in order to perform the two engaging and disengaging ramps.
Using the Pr102 parameter and the predefined functions that already they previewed the two
tables is possible to calculate the engage in Tab1 with Pr102=9 and the disengage in Tab2
with Pr102=10.
Through the commands of the functions predefined is always estimated the function of
Gearing (Y=X) in Tab0 with Pr102=5. The Tab3 can be replaced in this application with one
fictitious table qualifying the bit b181.8=1, setting up the constant of the table in Pr105. It’s
possible to extrapolate in this application the constant of Pr105; reading the first value of the
table of Tab1 engage in Pr104 with Pr103=1256.
Master with
ositive s
ee
Master with ne
ative s
ee
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