Mitsubishi Electric A800 Plus Series Function Manual page 174

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Initial winding diameter calculation deadband setting (Pr.1253, Pr.1254)
• When performing initial winding diameter calculation, winding diameter calculation deadband can be set for the target
position and the lower limit position of the dancer roll.
• Setting a deadband suppresses hunting of dancer control at a start, and reduces the influence of overshooting on the target
position.
• Use Pr.1253 Initial winding diameter calculation deadband or Pr.1254 Initial winding diameter calculation deadband
2 to set the ratio of the deadband, assuming that the distance between the target position and the lower limit position is
100%.
Deadband
Initial winding diameter
| Target position - Lower limit position | × Pr.1253/100
deadband
Initial winding diameter
| Target position - Lower limit position | × Pr.1254/100
deadband 2
Target position
Lower limit position
Deadband 2
Initial winding
diameter
calculation
is performed.
Deadband 1
Speed control gain during initial winding diameter calculation at a start
(Pr.1256, Pr.1257)
• When performing initial winding diameter calculation, inverter's speed control proportional gain and integral time during
winding diameter calculation can be set separately. After initial winding diameter calculation is completed, normal speed
control gain is applied.
Dancer roll target position
Deadband 1
Dancer roll position
Start command
Speed control proportional gain
Speed control integral time
Y232
Calculation formula
Target position < Lower limit position
Target position
L
Lower limit position
Deadband 2
Initial winding
diameter calculation
is performed.
ON
Pr.1256
Pr.1257
Initial winding diameter calculation
WINDING DIAMETER COMPENSATION FUNCTION
Winding diameter calculation setting
Description
Deadband on the lower limit position
Deadband on the target position
Lower limit position
Deadband 1
Initial winding
diameter
L
calculation
is performed.
Deadband 2
Target position
When the deadband is smaller, fluctuation of the
dancer roll becomes less at operation shift from
initial winding diameter calculation to dancer control.
Pr.820
Pr.821
ON
Normal dancer control
8
173

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