5.4 Details of Function Codes
5-246
Table 5.4-170 Setting method of the speed reduction ratio
Function Code Name Setting Contents
d15 Home return encoder pulse number Encoder pulse number is set in hexadecimal [P/R]
d16 Pulse compensation factor 1
d17 Pulse compensation factor 2
Speed reduction ratio of the whole machinery
d17/d16
c
d
a
b
r
r
K
K
1
2
1
2
=××=
d16 = Setting of denominator factor for speed reduction ratio
(K1 = r1 x a x c)
d17 = Setting of numerator factor for speed reduction ratio (K2
= r2 x b x d)
Peripheral speed (line speed) command
For the speed command under the constant peripheral speed, it is necessary to use the wind speed (line
speed) command.
Setting with digital inputs
To digitally set a peripheral speed (line speed) in m/min, set as follows.
Table 5.4-171
Function Code Name Setting Contents
E48 LED monitor detail 5: Line speed
E50 Speed indication coefficient
bp
ra240
K
1
s
×
=
π
Ks: Speed indication coefficient (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 of winder (initial value before
winding) (m)
Setting with analog inputs
To specify a peripheral speed (line speed) using analog inputs, set an analog input (0 to 100%) based on the
following relationship.
p x b x 100
Analog input (%) =
240
π x r
1
x a x fmax
x V
V: Peripheral speed (Line speed) (m/min), fmax: Maximum output frequency (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 peripheral speed at a constant level.
Table 5.4-172
Function
Code
Name Adjustment Point
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 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.
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