5.3 Description of Function Codes
5-235
FUNCTION CODES
Chap 5
Line speed control
In a winder system (e.g., roving frames, wiredrawing machines), if the inverter continues to run the motor at a
constant speed, the take-up roll gets bigger with materials (roving, wire, etc.) and its radius increases so that the
winding speed of the take-up roll increases.
To keep the line speed (winding speed) constant, the inverter detects the winding speed using a speed sensor
(encoder) and controls the motor rotation according to the encoder feedback.
Machinery configuration of winder system and function code settings
Shown below is a machinery configuration of a winder system for which it is necessary to configure the function
codes as listed below.
Inverter
Encoder
I/F card
U, V, W
R, S, T
Reduction ratio a:b
(When the motor shaft
rotates “b” times, the take-
up roll shaft rotates “a”
times.)
Speed v
in winding direction
Drum
Winder
(The radius of the take-up roll increases
as the roll rotates.)
Speed ｖ
A/B phase or B phase
Motor
Encoder
b
a
c
d
Reduction ratio c： d
(When the speed detector shaft
rotates “d” times, the encoder
shaft rotates “c” times.)
Radius of take-up roll (r
1)
Speed detector
radius r
2
• Speed reduction ratio between motor shaft and take-up roll shaft a : b
• Speed reduction ratio between speed detector shaft and encoder shaft c : d
• Radius of take-up roll before winding r
1
• Radius of speed detector r
2
Table 5.3-32 Setting the Reduction Ratio
Function code Name Settings
d15 Encoder pulse resolution Encoder pulse resolution (P/R)
d16 Pulse scaling factor 1 Speed reduction ratio of the whole machinery (load)
d16: Denominator factor for the speed reduction ratio
(K1 = r1 × a × c)
d17: Numerator factor for the speed reduction ratio
(K2 = r2 × b × d)
d17 Pulse scaling factor 2
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