Inovance MD500-PLUS Series - 3.6.5 Roll Diameter Calculation

Function Application
‑626‑
3.6.5 Roll Diameter Calculation
Roll diameter is a required parameter in any tension control mode. Select a proper
calculation method and set the related parameters correctly to ensure accuracy of
the roll diameter. Otherwise, the tension control function may fail.
Para.
No.
Name Default
Value Range Description
B0‑07
Roll diameter
calculation
method
0
0: Calculated based
on linear speed
This calculation method is independent of material
thickness. The roll diameter is calculated based on linear
speed and running frequency in real time, so the error is
not accumulated.
Note: This calculation method is applicable to central
winding/unwinding instead of surface winding/
unwinding. "
Figure 3–73 Surface winding/unwinding " on
page 627
is a diagram of typical surface winding/
unwinding, where the AC drive shaft is not coaxial with
the winding/winding shaft, so the roll diameter cannot
be calculated based on linear speed.
1: Calculated based
on accumulative
thickness
This calculation method does not require linear speed.
The roll diameter is calculated based on the
accumulative material thickness and revolution
calculation signals. The calculation result is stable, but
the error is accumulated.
Set the following parameters for this application:
● Material thickness: B0‑31 to B0‑36
● Revolution calculation signal source: Function 61 of the
DI terminal (revolution count signal)
● Operation relationship: B0‑29 (number of pulses per
revolution) and B0‑30 (revolutions per layer, for wire
rods)
2: AI1 The roll diameter can be obtained through one of
methods 2 to 6. These methods can be used in scenarios
where the roll diameter is directly measured by using a
sensor or calculated outside the AC drive.
When the preceding calculation methods are used, the
maximum roll diameter (B0‑08) must be set correctly
based on the per‑unit relationship. When AI1 is enabled
(B0‑07 is set to 2 ), 100.0% AI1 input must correspond to
the maximum roll diameter (B0‑08).
3: AI2
4: AI3
5: Pulse input (DI5)
6: Communication
(1000H)
7: Digital setting
(B0‑14)
When calculation method 7 is used, the roll diameter is
directly set through B0‑14 and used for additional
communication address or manual roll diameter setting.