Patent DE-10042907-A1 (DE)
Title: Ring spinning machine, with a number of spinning stations, has fault detectors at the electrical drives which are linked to the central control for switching off and restarting
Inventor: CHRISTEN PETER
IPC: D01H1/22
Filed: 2000-08-31
Abstract: The spinning machine (10), and especially a ring spinner with a number of spinning stations and sliver drawing units, has a number of electrical drives (12,14,16) for them which are controlled at least partially by frequency setters or converters (20,22,24), and a central control unit (28). At least one fault detector (30,32) is at the frequency controls for the drawing unit drives and/or at the drawing unit drive. It registers faults at the drawing units, to be reported to the central control.  The ring spinning machine has at least one sensor at the fault detector. The central control has at least one signal reception unit, at least one evaluation unit, at least one switch system to alter the machine function and/or at least one logic component. According to the signal feedback to the central control, at least one setting unit for at least one drive or a sub-group of drives can be triggered and especially switched off. According to the individual fault reports, the central control can shut down separate drives or the whole machine, and preferably with deceleration until at rest. A fault detector is at each frequency control for each drawing unit drive. The same drive structure and frequency control as for the drawing units, with fault detectors, is used for the electrical drives for the spinning stations, the doffers, sleeve and bobbin transport systems, linked to the central control. A fault which is registered by a detector is reported directly to the central control. At least one detector registers heat and at least one detector monitors the current consumption by a drive motor. At least one fault detector is structured to monitor the phase voltage at the drive coil or the PWM switch-on times. At least one detector acts as a local control unit at its station. The motor rotary speed is controlled by the central and/or local control to maintain a given maximum current consumption, and a given maximum temperature at the drive motors. At least one detector has a fault diagnosis function. At least the frequency controls for the drawing unit drive motors are supplied with DC through a common intermediate circuit (34), from at least one of the frequency controls at the spinning stations or spindle drives. The spindle drives are from at least one central motor or a number of motors. The fault detectors also monitor the synchronizing of similar drives, especially where identical drives are used for the drawing units. The central control has a memory to store program data, as parameter sets to be passed to the frequency controls. A detected fault is indicated by a display and/or a warning lamp. The central control can activate a reset process for at least part of the drive system. The detectors are structured with a dedicated local intelligence. The central control can interrogate the fault detectors, to establish the condition of the whole spinning machine, and it can discriminate between faults which can be rectified and faults which cannot be remedied. It also determines which sections can be restarted after a fault stoppage, and generates a warning when the machine is started again. Fault data are stored locally at the detectors, to be interrogated by the central control.