JPH09163781A - Driving controller for synthetic fiber yarn manufacturing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a driving controller for synthetic fiber yarn manufacturing machine which can conduct continuous operation without generating yarn breakage even if instantaneous power failure occurs, and take proper steps against longer instantaneous service interruption than conventional techniques. SOLUTION: This controller is provided with an instantaneous stop detector 32 which detects that input voltage into the power input part of a common converter 23 is lower than is prescribed value, and an instantaneous service interruption detecting relay 33. At the same time when the signals from the instantaneous service interruption detector 32 and the instantaneous service interruption detecting relay 33 are inputted into respective inverters 24-29 according to inertia force, deceleration is made by the decelerating quantity of prescribed proportion from the operating speed during preset period. When the input voltage is restored to the prescribed value or higher within preset time, the speed of respective motors 5 is controlled so as to be increased to the operating speed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive control device for a synthetic fiber yarn manufacturing machine that can be operated without causing yarn breakage even if a momentary power failure occurs in the synthetic fiber yarn manufacturing machine.

[0002]

2. Description of the Related Art Generally, a metering pump for spinning, a godet roller for take-up, and
A bobbin mounting spindle of the winding device, a traverse mechanism, and other driving electric motors are driven and controlled by an inverter having a common converter installed corresponding to each electric motor.

When a momentary power failure (hereinafter referred to as a momentary power failure) occurs during operation of the above-mentioned synthetic fiber yarn manufacturing machine, the detector installed in each inverter detects the instantaneous power failure and the The command frequency signal output to the electric motor is cut off or output again.

Further, when an instantaneous blackout occurs, the controller switches from feedback control to open control and sends a control signal to the inverter to continue lowering the frequency to a level where inertial force power generation can be used, and each device is regenerated by regenerative current. It has been proposed to control the speed of each motor so that the speed is uniformly reduced and when power is restored, the open control is switched to feedback control to increase the speed.

[0005]

However, in the former method of detecting the instantaneous blackout for each inverter and interrupting the output of the command frequency signal and re-outputting it, the method such as the length of the instantaneous blackout, the metering pump, the godet roller, There is an inverter in which the control operation is stopped due to a difference in inertial force of the spindle or the like, and there is a problem that yarn breakage occurs and continuous operation cannot be performed.

In the latter method of controlling by sending a control signal from a controller to an inverter by communication, the control method switching time and the signal transmission time are lengthened, and the operation is delayed in actual control. However, there is a problem that accurate control cannot be performed during a momentary power failure for a short time.

The present invention can cope with high-speed control even if a momentary power failure occurs, can perform continuous operation without causing yarn breakage, and is capable of achieving a long-time instantaneous power failure as compared with the prior art. An object of the present invention is to provide a drive control device for a synthetic fiber yarn manufacturing machine that can deal with the problem.

[0008]

In order to solve the above-mentioned problems, a drive control device for a synthetic fiber yarn manufacturing machine according to the present invention has an input voltage at a power supply input part of a converter which is below a predetermined value. A momentary blackout detector and a momentary blackout detection relay are provided to detect that the power has become low, and the inverters are set in advance at the same time as the signals from the instantaneous blackout detector and the instantaneous blackout detection relay are input in response to inertial force. During the set time, the motor speed is decelerated by a deceleration amount of a predetermined ratio from the operating speed at that time, and when the input voltage recovers to a predetermined value or more within the set time, the speed of each motor is controlled to increase to the operating speed. It is configured to have a control function.

Further, the converter as claimed in claim 2, formula C = 2 × L × t / V0 2 -V1 can be provided the capacity or capacitor obtained by ^2, C in the formula capacitance ( F), L are loads (W), t is instantaneous power failure detection delay time (sec), V0 is the converter output bus voltage (V) in the steady state, and V1 is a voltage (V) that the inverter does not detect as a low voltage. .

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram of a drive control device of a synthetic fiber yarn manufacturing machine. The synthetic fiber yarn manufacturing machine has a spinning device 1 for spinning a molten polymer into a yarn from an upstream and a take-up device. A godet roller device 2 for winding and a winding device 3 for winding a yarn around a bobbin while traversing the yarn are arranged in this order.

The spinning device 1 has a metering pump 4 for quantitatively feeding the molten synthetic resin polymer, and a die 5 for discharging the synthetic resin polymer into a plurality of filaments.
The godet roller device 2 includes a driving motor 11 and a driving motor 11 for driving the metering pump.
Godet rollers 7, 8, in which 2, 13, 14 are connected,
It is composed of 9, 10.

The winding device 3 has a traverse mechanism 15
And bobbin mounting spindles 16 and 17, and motors 18, 19 and 20 for driving these.

Each of the above-mentioned motors 6, 11-14, 18-2
In the case of 0, the rotation speed is controlled by the control device 21.

The control device 21 includes a common converter 23 to which a commercial AC power source 22 is input, an inverter 24 for controlling the motor 6 for driving the metering pump, and an inverter 25 for controlling the motors 11, 12 for driving the godet roller. An inverter 26 for controlling the motors 13 and 14 for driving the godet roller, an inverter 27 for controlling the motor 19 for driving the traverse mechanism, and inverters 28, 29 for controlling the motors 19 and 20 for driving the spindle.
And an inverter controller 30 that sends a control signal to the inverters 24, 25, 26, and inverters 27, 28, 2
The winder controller 31 sends a control signal to 9 and the like.

Commercial AC power supply 22 of the converter 23 described above
The instantaneous blackout detector 32 and the instantaneous blackout detection relay 33 are connected to the input section of the, and the detection signal contacts 34 to 40 of the instantaneous blackout detection relay 33 are input to the winder controller 31 and the respective inverters 24 to 29. .

Further, the converter 23 is provided with a capacitor 41 as a countermeasure against instantaneous blackout.

In the above-described synthetic fiber yarn manufacturing machine, the synthetic resin polymer melted in the spinning device 1 is fed by the metering pump 4 in a fixed amount and spun from the spinneret 5 as filament. The spun filaments are bundled into a yarn, which is wound around the godet rollers 6 and 7 of the godet roller device 2 and the driving force is transmitted to be taken up. The yarn sent from the godet roller device 2 is traversed by the traverse mechanism 8 and wound on a bobbin mounted on the spindle 16.

During steady operation of the synthetic fiber yarn manufacturing machine, the motor 6 for driving the metering pump and the motors 11, 12, 13, 14 for driving the godet rollers are the inverter 24 which receives the operating frequency command from the inverter controller 30.
The motors 19 for driving the traverse mechanism and the motors 19, 20 for driving the spindle drive the inverters 27, 28, 2 which are driven by the outputs of the drive motors 26 to 26 and have received the operating frequency command which changes with the winding of the winder controller 31.
Driven by the output of 9.

Normally, only one of the spindles 16 and 17 is driven during winding, and both are driven only during automatic yarn switching.

When the instantaneous blackout detector 32 detects an instantaneous blackout during operation, the instantaneous blackout detection relay 33 operates.

At this time, the operating time of the instantaneous blackout detector 32 and the instantaneous blackout detection relay 33 is about 20 msec and the inverter control delay time is about 10 msec. Within this time (about 30 msec), the common output bus of the converter 23 is When the voltage drops and becomes lower than the low voltage detection level (50%) of the inverters 24-29, the respective inverters 24-29 stop.

Therefore, in order to suppress the voltage drop of the output bus of the converter 23 to about 70%, the converter 23
Backup is performed by the condenser 41 provided in the.

The capacity [C (F)] required by the capacitor 41 is the load [L (W)], the instantaneous power failure detection delay time [t (sec)], and the output bus voltage of the converter 23 in the steady state. If [V0 (V)] and the voltage that the inverter does not detect as a low voltage are [V1 (V)], it can be calculated by the following formula.

[0024] Here, the number of positions supplied by the common converter 23
Is 16, load per position (L) is 15 kW, momentary power outage
Detection delay time (t) is 30msec, converter output mother
Assuming that the line voltage (V0) is 300V and the inverter is low voltage
Capacitor when undetected voltage (V1) is 210V
-When the capacity (C) is calculated, And the condenser capacity (C) is about 0.3 (F).
You.

The capacity of the condenser 41 actually installed in the common converter 23 may be a value obtained by subtracting the capacity of the condenser built in each of the inverters 24 to 29.

When the instantaneous blackout detector 32 detects an instantaneous blackout, the contacts 34 to 40 of the instantaneous blackout detection relay 33 are turned on, and the detection signals are input to the respective inverters 24 to 29, the inverter controller 30 and the winder. The command from the controller 31 is held, decelerated in a pattern as shown in FIG. 2, and then accelerated.

This function is incorporated in the control software of the inverter, and the deceleration amount (fα) and the deceleration time (tα) are set as control constants of the inverter.

The above deceleration amount (fα) is determined by the operating frequency (f
It is necessary to set the rate [a (%)] of reduction in advance because it depends on how much it is reduced from n), and the deceleration amount (fα) can be obtained by the following formula.

[0029] The above-mentioned reduction rate [a (%)] is usually set to 5 to 30%, but the godet rollers 7 to 10 and the spindles 16 and 17 having a large inertia force decelerate faster than the free run to generate regenerative energy, and Small metering pump 4
The traverse 15 is normally set to 1 so that the regenerative energy can supply the necessary electric power as a slower deceleration than the free run.
Set 0 to 15%.

The setting range of the deceleration time (tα) is 1 to
Although it is set to 5 seconds, it is set to 2 seconds because the normal instantaneous power failure time is within 2 seconds.

Based on these, the above-mentioned inverters 24 to 29 input the instantaneous blackout detection signal and, at the same time, perform a pattern as shown in FIG. 2 (a deceleration amount of a predetermined ratio from the operating speed at that time for a preset time). Only when the input voltage recovers to a predetermined value or higher within a set time, the motor speed is increased to the above-mentioned operating speed).

It is preferable that the ratios of the above-mentioned deceleration amounts are the same.

While the winding device 3 constantly changes the operating frequency according to a command from the winder controller 31 during winding, during the momentary power failure, the contact 34 of the momentary power failure detection relay 33 is input to the winder controller 31 and the inverter 27 is operated. ~ 29
By holding the command for, it becomes possible to decelerate to a pattern as shown in FIG. 2 and then accelerate.

When the input voltage to the converter 23 does not recover to a predetermined value or more within the deceleration time due to the above-mentioned momentary power failure, the inverters 24 to 29 stop outputting and the motors 6, 11 to 14 and 18 are stopped. ~ 20 will stop after a free run.

[0035]

As described in claim 1, the drive control device for the synthetic fiber yarn manufacturing machine according to the present invention detects an instantaneous power failure for detecting that the input voltage at the power input portion of the converter is below a predetermined value. And an instantaneous blackout detection relay is provided, and at the same time as inputting signals from the instantaneous blackout detector and the instantaneous blackout detection relay to each of the inverters in response to inertial force, a predetermined time is set from the operating speed at that time for a preset time. The motor is decelerated by the deceleration amount of the ratio, and when the input voltage recovers to a predetermined value or more within the set time, it has a control function to control the speed of each motor so as to increase to the operating speed. As soon as a stoppage occurs, the control function provided in each inverter itself can control the deceleration and speedup of each motor according to each inertial force, allowing continuous operation without yarn breakage. It is possible Nau, can correspond to high-speed control.

According to a second aspect of the present invention, there is provided a drive control device for a synthetic fiber yarn manufacturing machine in which a converter is provided with a capacitor capacity [C (F)], a load [L (W)], and an instantaneous power failure detection delay time. Is [t (sec)], the output bus voltage of the converter in a steady state is [V0 (V)], and the voltage that the inverter does not detect as a low voltage is [V1 (V)]. C = 2 × W × t
/ V0 ² -V1 can correspond to instantaneous stop of a long time over the prior art because it is the structure in which a capacity more capacitors obtained by ^2.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of a drive control device of a synthetic fiber yarn manufacturing machine according to the present invention.

FIG. 2 is a schematic diagram showing a change in inverter output frequency during a momentary power failure.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Spinning device 2 Godet roller device 3 Winding device 4 Metalling pump 5 Clasp 6, 11, 12, 13, 14, 18, 19, 20 Motor 7, 8, 9, 10 Godet roller 15 Traverse mechanism 16, 17 Spindle 21 Control device 22 Commercial AC power supply 23 Converter 24, 25, 26, 27, 28, 29 Inverter 30 Inverter controller 31 Winder controller 32 Instantaneous power failure detector 33 Instantaneous power failure detection relay 34, 35, 36, 37, 38, 39, 40 Contact 41 Capacitor

Claims (2)

[Claims] 1. A drive control device in which various motors in a synthetic fiber yarn manufacturing machine are each driven by a plurality of inverter power sources having a common converter,
An instantaneous blackout detector and an instantaneous blackout detection relay for detecting that the input voltage has become equal to or less than a predetermined value are provided in the power supply input part of the converter, and the instantaneous blackout detector is provided to each inverter according to the inertial force. At the same time as the input of the signal from the instantaneous power failure detection relay, the operating speed at that time is decelerated by a deceleration amount of a predetermined ratio for a preset time, and if the input voltage recovers to a predetermined value or more within the set time, A drive control device for a synthetic fiber yarn manufacturing machine, which is equipped with a control function for controlling the speed of each motor so as to increase the operating speed. 2. The converter is calculated by the following formula.
Claims characterized by having a capacitor of a capacity or more
Item 1. A drive control device for a synthetic fiber yarn manufacturing machine according to Item 1. C: Capacitor capacity (F) L: Load (W) t: Instantaneous power failure detection delay time (sec) V0: Steady state converter output bus voltage (V) V1: Voltage that the inverter does not detect as a low voltage (V)