Mitsubishi Electric FR-A700-A1 Instruction Manual page 75

Dancer control with winding diameter
compensation for wiredrawing machine
Parameter Name
720 Maximum winding diameter 1
721 Minimum winding diameter 1
756
First acceleration time for main speed
757
First deceleration time for main speed
763 Line speed input selection
771 r-r' limit value (diameter)
773
Gear ratio numerator (driver side)
774 Gear ratio denominator (follower side)
777 Speed control proportional gain 1
778
Speed control proportional gain 2
779 Speed control proportional gain 3
780 Speed control proportional gain 4
781 Winding diameter storage selection
Operation time with stored winding
783
diameter
792
Accumulated amount
800
Control method selection
821
Speed control integral time 1
822 Speed setting filter 1
862
Notch filter time constant
863
Notch filter depth
903 Terminal 2 frequency setting gain
72
Initial
Setting
Value
Especially, initial diameters (minimum value at winding shaft)
2mm 400mm
should be input accurately.
1mm 280mm
Less time than acceleration/deceleration of main speed setting
(terminal 2 to 5) is set.
15s 0.5s
(In this case, cushion time is already included by high-order
system. 0.5s is set as EMI measure.)
15s 0.5s
No line speed input. (Line speed is calculated from the main
0 0
speed.)
Longer value than the increment in winding diameter calculation
1mm 0.1mm
at (Pr. 707) Sampling time for winding diameter calculation is set.
Gear ratio of unwinding shaft is set.
1 10
Should be set accurately.
1 12
Response level is improved by adjusting the speed control
proportional gain according to the winding diameter. Speed
control proportional gain is adjusted with maximum diameter (Pr.
9999 100%
780) and minimum diameter (Pr. 777).
Pr. 778 = /5 + Pr. 777,
Pr. 779 = 8  /15 + Pr. 777 ( = Pr. 780 - Pr. 777)
9999 140%
9999 200%
9999 300%
Input of diameter clear signal X55 is necessary to assign to a
terminal when winding diameter storage is enabled.
Winding diameter (EEPROM write) is stored when power is shut
off or X83 is OFF.
0 1 It is not stored to EEPROM when RES signal is ON. Should not
input RES unless inverter alarm or fault occurs.
When RES input is necessary for an inverter alarm or in such
case, turn X83 OFF before RES input, then input X83 again so
that stored winding diameter can be used.
Setting is always necessary to activate winding diameter storage.
0s 0.01s
(If not set, stored data is not reflected.)
160mm 9999 Without initial winding diameter calculation
20 0 0: Vector control (speed control)
When dancer control is activated, integral time is set invalid so
0.333s 0s
that the inverter operates as a proportional amplifier.
9999 0.5s Setting when EMI is superpositioned in analog signal.
0 20 Setting to reduce whining sound at a motor stop.
0 2
V =2000m/min, 10V input, D
max
Set according to the rotation speed at V
command at the time (maximum voltage command for terminal 2
60Hz/ 90.95Hz/
to 5.)
10V 100%
 = V / (  D
max
90.95Hz
Description
=280mm, gear ratio=1/1.2
min
D
max, min
3
 gear ratio) = 2000  10 /( 280  1/1.2)/30
min
and the speed