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V&T EcoDriveCN® AC variable speed drives of applications on knitting machine.

visit some photos in textile industries, such as adjustable speed drives on circular knitting machine (circular loom), spinning frame, splitting machine, textile winding machine.

I. Technical Introduction

The spinning-frame is main spinning machine. The yield and quality of spun yarn comprehensively reflects merits and shortcomings of each working procedure in spinning process.

The spinning-frame's production unit is spindle. The yield (kg) per thousand spindle hour is frequently used to measure production-level of spinning-frame.

The spinning mill's production scale is represented by total spindles of spinning-frame. The spinning yarn on each spindle would be broken for all kinds of reasons. The end breakage rate is frequently represented by number of broken ends per thousand spindle hour. The end breakage rate affects labor productivity, equipment productivity, spun yarn quality and workshop dust content.

The spinning-frame is a machine with the most dissipation energy in spinning. Decreasing end breakage rate and energy saving is a technical level mark of spinning-frame.

The special variable frequency drive (VFD) is rich in application experience in spinning industry, especially in spinning-frame industry. Through multiyear research, V&T EcoDriveCN® drives understand each process flow and launches the dedicated inverter (variable frequency drive, VFD) for spinning-frame.

Its technical features are as follows:

a. Small yarn stage occupies 15% of total length ,but end breakage rate is about 70%. The speed at small yarn stage can be decreased appropriately according to yarn status so as to decrease end breakage rate.

b. Middle yarn stage occupies 80% of total length. The end breaking is extremely few, occupying around 10%. The motor speed can be increased appropriately at this stage so as to improve efficiency.

c. Large yarn stage occupies 5% of total length. The end breaking is 20%. The motor rotation speed can be decreased appropriately at large yarn stage to decrease end breakage rate and improve the product quality.

The technical curve control at multistage speeds can be performed for frequency converter (variable speed drive) according to spinning-frame features. The running schematic diagram is shown in Figure 1.


Figure 1 Running schematic diagram of spinning-frame

It can be known from Figure 1 that low speed running of frequency converter is effective at initial period and frequency converter outputs low speed running command;

After low speed running command is cancelled, the frequency converter runs according to a curve set by multistage speed technique. The frequency converter accelerates to multistage speed 1 for running.

Along with increase of the first stage length, frequency gradually increases. After running of the first stage length is completed, frequency converter runs at multistage speed frequency 2. This process changes at uniform speed;

Each section yarn length setting is increased in sequence. The parameter design can be set from full yarn length commencement, gradually decreasing each section length setting. Each section length is limited by the next section length.

It satisfies the following relation: the first length < the second length < the third length…….< The 13th length <the 14th length.

Monitoring for spinning machine status: It can display the running section position and shift number during work and perform real time record for current spinning length, pulse number and other multistage speed states.

It is provided with full yarn, impulse signal losing warning function. After program completes running for a cycle, output terminal Y1 outputs 2 ~ 3S impulses and then stops.

II. Functional Feature

Shift change control function, available for recording yield in each shift.

Warning function for full yarn and impulse signal lost.

Multistage speed technical curve control, reset function.

Independent meter quantity reset function, available for intermediate inspection.

Spinning machine status monitoring, text display unit is available for monitoring running status.

After completing a cycle, the program automatically returns to the starting point to get ready for the next time running.

Meter count function, high-speed roller pulse count, not counting during equipment rest and recuperation.

Power-fail storage function: After power feed is recovered, it keeps on running from segment position and frequency before power-fail.

III. Mode of Connection


Figure 2

Input terminal function:

X1 When selecting spinning-frame function, start the inverter.

X2 Jog (the highest priority), low speed running signal. Low speed running signal is applicable for equipment finishing and is provided with higher priority than multistage speed. Set low speed running frequency through H1.00. The meter quantity in this stage will not be counted into total spinning length.

X3 Shift control signal (each time you press it, the shift number will be changed according to sequence of A, B, C and D). In order to be convenient for statistics of spinning quantity in each shift, switch on this terminal, then shift number changes according to sequence. It is equipped with 4 shifts, namely A, B, C and D.

Each time you switch on X3, then current shift number is converted into the next shift number. At this time, spinning meter quantity will autonomously increase to new spinning yield. The yield of each shift can be viewed through H1.21 ~ H1.24.

X4 Independent reset terminal (each time you press it, independent meter quantity will be reset to 0). The technical curve is not reset and used for debugging and judgment in pilot process.

X5 Reset terminal for current spinning meter quantity (each time you press it, current spinning meter quantity will be reset to 0).

X6 For technical curve reset signal, each time you press it, running speed will be returned to initial speed of curve setting for running over again.
X7 Roller impulse signal input. Magnetic induction type meter count pulse input. Each time roller rotates for a round, pulse number will be increased by 1.

Output terminal function:

RA,RB,RC Output pulse after completion of curve, clear away pulse output during restart or when output time attains pulse output detection time;

Y1 When meter count impulse signal is lost, output alarm signal. This alarm signal disappears during restart;

Y2 During full yarn, output alarm signal. This signal disappears during restart.

Note: The function code setting for above terminals are P5.00 = 32, P5.01 = 33, P5.02 = 34, P5.03 = 35, P5.04 = 36. The impulse input is fixed as X7 terminal. P7.00 = 33, P7.01 = 34, P7.02 = 32.

IV. Parameter Setup

Function code No.	Function code name	Role in spinning process
P4.22~P4.36, H1.00, H1.32	Multistage frequency	Multistage frequency setting in spinning process
H0.00	Functional mode  selection	Whether to  select spinning function mode
H1.01	Roller diameter	It can set roller diameter
H1.02~H1.16	Each segment size	Setting each segment size in spinning process
H1.17	Current shift number	It can provide setting of four shifts, A, B, C and D.
H1.18~H1.29	Running status	Current running status and each shift's spinning length
H1.30,H1.31	Signal duration	It can set duration of input-output signal
H1.33	Impulse losing processing mode	It can select whether to process when impulse signal is lost

V. Appendix: increased function code description

Function code No.	Function code name	Default	Setting range	Unit	Attribute	Function code option
P2.02	Running displays parameter selection	1CB0	0~FFFF	/	0	LED unit's place:
						0: Reference frequency(Hz); 1: Bus voltage(V); 2: Current spinning meter quantity; 3: Front roller linear velocity; 4: Reserved; 5: DI (%); 6: External count; 7: Motor speed ( rpm); 8: Closed loop reference(%); 9: Closed loop feedback(%); A: Reference torsion(%); B: Running frequency(Hz); C: Output current(A); D: Output torque(%); E: Output power(kW); F: Output voltage(V); LED unit's place, hundreds place, thousands place
H0.00	Running mode	1	0~1	/	0	0:non-spinning-frame mode; 1: spinning-frame mode
H1.00	Low speed running frequency	30.00	0.0~P0.13	Hz	0	frequency upper to frequency lower limit ( P0.13 ~ P0.14)
H1.01	Front roller diameter	25	0~100	mm	0	0~100mm
H1.02	The 1st length	100	0~65535	m	0	0~65535m
H1.03	The 2nd length	200	0~65535	m	0	0~65535m
H1.04	The 3rd length	300	0~65535	m	0	0~65535m
H1.05	The 4th length	400	0~65535	m	0	0~65535m
H1.06	The 5th length	500	0~65535	m	0	0~65535m
H1.07	The 6th length	600	0~65535	m	0	0~65535m
H1.08	The 7th length	700	0~65535	m	0	0~65535m
H1.09	The 8th length	800	0~65535	m	0	0~65535m
H1.10	The 9th length	900	0~65535	m	0	0~65535m
H1.11	The 10th length	1000	0~65535	m	0	0~65535m
H1.12	The 11th length	1100	0~65535	m	0	0~65535m
H1.13	The 12th length	1200	0~65535	m	0	0~65535m
H1.14	The 13th length	1300	0~65535	m	0	0~65535m
H1.15	The 14th length	1400	0~65535	m	0	0~65535m
H1.16	Doffing length	200	0~65535	m	0	0~65535m
H1.17	Current shift number	A	A~D	/	*	Four shifts of A, B, C and D
H1.18	Current spinning meter quantity	0	0~65535	m	*	0~65535m
H1.19	Current shift meter quantity	0	0~65535	m	*	0~65535m
H1.20	Meter quantity of shift A	0	0~65535	m	*	0~65535m
H1.21	Meter quantity of shift B	0	0~65535	m	*	0~65535m
H1.22	Meter quantity of shift C	0	0~65535	m	*	0~65535m
H1.23	Meter quantity of shift D	0	0~65535	m	*	0~65535m
H1.24	Low bit of whole meter quantity	0	0~65535	m	*	0~65535m
H1.25	High bit of whole meter quantity	0	0~65535	m	*	0~65535m
H1.26	Low bit of roller  pulse number	0	0~65535	/	*	0~65535m
H1.27	High bit of roller pulse number	0	0~65535	/	*	0~65535m
H1.28	Independent meter quantity	0	0~65535	m	*	0~65535m
H1.29	Current running segment position	1	0~15	/	*	0~15 segments Segment 0 ~ 15
H1.30	Output impulse detection width	2. 0	0.0~3600.0		0	0.0~3600.0s
H1.31	Impulse losing processing delay time	2. 0	0.0~3600.0		0	0.0~3600.0s
H1.32	Doffing frequency	10. 0	0 ~ frequency upper limit	Hz	0	frequency upper to frequency lower limit ( P0.13 ~ P0.14)
H1.33	Impulse losing processing mode	0	0~1	/	0	0:not processing ;1:processing
H1.34	Roller linear velocity	0.00	0~65535	m/s	0

P5.00~P5.06 Increase terminal function:

32: Inverter starting of spinning technical curve

33: Low speed starting of spinning

34: Spinning shift signal input

35: Reset signal input of independent meter quantity

36: Reset signal input of current spinning meter quantity

P7.00~P7.02 Increase terminal function:

32: Curve completion pulse output

33: Meter count impulse losing alarm output

34: Full yarn alarm output

35: Frequency converter spinning shutdown or zero-frequency running output.

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