5.3 Description of Function Codes
5-236
■ Line speed command
Under line speed control, speed commands should be given as line speed commands.
Setting with digital inputs
To digitally specify a line speed in m/min, make the following settings.
Function code Name Settings
E48 LED monitor
(Speed monitor item)
5: Line speed
E50 Display coefficient for
speed monitor
Ks: Display coefficient for transport time (E50)
p: Number of motor poles
a, b: Components of speed reduction ratio between motor shaft and
take-up roll shaft (When the motor shaft rotates “b” times, the
take-up roll shaft rotates “a” times.)
r1: Radius of take-up roll before winding (initial value) in m
Setting with analog inputs
To specify a line speed using analog inputs, set an analog input (0 to 100%) based on the following equation.
Analog input (%) =
p × b × 100
240𝜋 × r1 × a × f
max
× V
Where
V: Line speed in m/min
f
max
: Maximum frequency 1 (F03)
■ Adjustment
Like usual speed controls, it is necessary to adjust the speed command filter, speed detection filter, P gain, and
integral time in the speed control sequence that controls the line speed at a constant level.
Function code Name Key points
d01
Speed control
(Speed command filter)
If an excessive overshoot occurs for a speed command change,
increase the filter constant.
d02
Speed control
(Speed detection filter)
If ripples are superimposed on the speed detection signal so that
the speed control gain cannot be increased, increase the filter
constant to obtain a larger gain.
d03
Speed control P
(Gain)
If hunting is caused in the motor speed control, decrease the gain.
If the motor response is slow, increase the gain.
d04
Speed control I
(Integral time)
If the motor response is slow, decrease the integral time.
■ Cancel line speed control -- “Hz/LSC” (Function code E01 to E05, data = 70)
Turning ON “Hz/LSC” cancels line speed control. This disables the frequency compensation of PI processor,
resulting in no compensation for a take-up roll getting bigger and an increase in the winding speed.
Use this signal to temporarily interrupt the control for repairing a thread break, for example.
“Hz/LSC”
Function
OFF Enable line speed control (depending on d41 setting)
ON Cancel line speed control (V/f control, without compensation for a take-up roll getting bigger)
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