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CHAPTER 7 – Programming
SMT-BD1/t
The selection of both
Analog speed reference
and
Gearing ratio modulation by diameter sensor
allows a
typical unwinder accumulator control application, as shown on the following diagram:
The SMT-BD1/t amplifier is driving the spool motor according to the accumulator height measurement signal and
the diameter measurement signal. When the acumulator material is taken by the roller, the accumulator is going
up and the spool must start running in order to supply new material to the accumulator. So the accumulator height
must be controlled in order to have a linear height variation with regard to the material line speed. Furthermore,
when the spool diameter is decreasing, the motor speed value must be increased according to the diameter
measurement value in order to maintain the right accumulator height with regard to the material line speed. The
accumulator position at standstill (material line speed =0) can be easily adjusted by using the
Analog input
offset
parameter. This parameter adjustment allows to get an automatic material spool rewind up to the
accumulator standstill position at the sequence start.
5.4 - Speed 2 control sequence
Speed 2 control sequence parameters :
Motor
Accumulator
Running material
Roller
Accumulator height
measurement
SMT-BD1/t
amplifier
Material
spool
Diameter
measurement
Sequence
type
=
SPEED
2
Acceleration
time
(ms)
=
500
Running
time
(ms) =
500
Deceleration
time
(ms)
=
500
Internal speed set point
Speed set point value (rpm)
= 200
Analog speed reference
Speed ratio gain (%)
= 50
Next
sequence
=
5
Counter
=
Jump
=
Output
(87654321) =
........
Output
trigger
=
End
Start condition (87654321) =
.......[]
Stop