GEFRAN-SIEI ARTDrive Vector V2 Series - Page 297

Index
MENUMENU
MENUMENU
MENU [Unit] Access Default Min/Max Format Reg.Mode Level Ipa
Parameter Name
Description
ARTDrive V2 series - Instruction Manual Chapter 6 Parameter • 297
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 APPL CFG / PI control
Setting of the Starting Diameter
By selecting O03.47 - PID MltPI sel mon = 0, when the PI block is disabled (O03.00 - PID
PI enab src = 0), the last value of the calculated integral component is kept into memory.
Such integral component is displayed in O03.44 - PID PI out (it corresponds to the winder
diameter).
When the block is enabled again, the regulation starts from the calculated value.
The same function is foreseen also in case the drive stops.
This operative method can be used, when, by controlling, for example, a winder, it is
necessary to stop the machine, to disable the drive or to disconnect the switchboard.
By selecting O03.47 - PID MltPI selmon = 1-2-3, when the PI block is disabled, the
value of the O03.44 - PID PI out output is the same as the one of the set parameter.
When the Drive is stopped and then started again, the previously stated value is
automatically reset only if , during the power supply, the digital input, set as O03.00 - PID
PI enab src, is already at a high level.
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
 APPL CFG / PI control
Gain Increase at the Starting
When O01.21 - PID FF mon is lower than O03.14 - PI steady thr, the integral regulation
is frozen and the proportional gain gets the value set in O03.26 - PI Pinit gain.
When O01.21 - PID FF mon overcomes the threshold, the integral regulation is enabled
with the gain set in O03.27 - PI Iinit gain.
The PI block keeps the O03.26 - PI Pinit gain and O03.27 - PI Iinit gain gains for the
time set via O03.13 - PI steady delay. After this time, the gain values are brought
respectively to those generated by the gain adaptive.
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
 APPL CFG / PI control
PI Clamp Top and Bottom Setting
As previously stated, O03.44 - PID PI out is used as a multiplicative factor of the feed-
forward in order to obtain the motor angular speed reference; in case the PID function is
used to control a winder/unwinder, its value is inversely proportional to the winder
diameter.
By winding with a constant peripheral speed, it is possible to write that:
ϖ
0
φ
0
= ϖ
1
φ
1
where:
ϖ
0
= angular speed with a minimum diameter
φ
0
= minimum diameter
ϖ
1
= angular speed with the present diameter
φ
1
= present diameter
ϖ
1
= ϖ
0
x (φ
0
/ φ
1
)
By tuning the drive properly, ϖ
0
corresponds to a wrong feed-forward, therefore O03.44 -
PID PI out depends on (φ
0
/ φ
1
). It is possible to write that: O03.44 - PID PI out = (φ
0
/ φ
1
)
This formula can be used to check the right tuning execution when the system is active
or during the procedure for the calculation of the starting diameter.