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CHAPTER 7 – Programming
SMT-BD1/t
5.2 - Gearing ratio initialization sequence
Gearing ratio initialization sequence parameters :
This sequence must be executed before starting a variable diameter tension control sequence when
Gearing
ratio adaptation by line encoder
operation is selected in order to initialise correctly the gearing ratio gain
adaptation procedure before starting the material running. The gearing ratio gain estimation procedure is
described below :
•
The material must be stopped and locked at the roller level in order to be stretched by the spool driving
motor.
•
The spool driving motor is running at the constant rewind speed in order to stretch the material
•
The motor displacement is measured from the “Undertension limit” dancer position up to the “Tension set
point” dancer position and the gearing ratio gain is then calculated in the following manner :
Gearing ratio gain = Measured motor displacement / Master encoder reference displacement
If the master encoder displacement during the ratio init procedure execution is exceeding 10 % of the
Master
encoder reference displacement
parameter value (when the material is not correctly locked at the master roller
level), a ratio init sequence error is generated. When the
Time out
value is over before the end of the ratio init
procedure execution , a ratio init sequence error is also generated. When a ratio init sequence error is generated,
the ratio init sequence is immediately stopped and the sequence which number is given by the
Sequence error
link
parameter value is then automatically executed.
The
Master encoder reference displacement
parameter is measured when the material spool driving motor is
locked and the material is stretched at the roller level in order to move the dancer from the
Undertension limit
position up to the
Tension set point
position. The
Undertension limit
parameter value is entered in the
Tension
control
parameters menu.
Sequence
type
=
RATIO
INIT
Tension set point (V)
= 2.5
Master encoder reference displacement (pulses)
= 3500
Rewind motor speed (rpm)
= -20
Accel./Decel.
time
(ms)
=
500
Time
out
(s)
=
4
Next
sequence
=
5
Output
(87654321)
= ........
Start condition (87654321) =
........
Motor
Dancer
Master encoder
Tension set point
Undertension limit
Material
spool
Roller