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Safety torque turn-off circuit and system

A safe torque off, circuit technology, applied in control systems, emergency protection circuit devices, electrical components, etc., can solve problems such as potential safety hazards, switch tube short-circuits, and the drive cannot enter the safe torque off state, to prevent Unexpected start, improved safety, guaranteed torque off effect

Pending Publication Date: 2020-06-09
NINGBO ANXIN CNC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the switch tube inside the safe torque off circuit fails, one of the failure modes is a short circuit of the switch tube. When this failure mode occurs, when the voltage of the input STO signal is low, the safe torque off circuit The internal power supply will also output the preset voltage through the short-circuited switch tube, so that the driver cannot enter the safe torque off state
At this time, the driver can be operated through the software of the driver or the enable switch, which has certain potential safety hazards.

Method used

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  • Safety torque turn-off circuit and system
  • Safety torque turn-off circuit and system

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Embodiment Construction

[0045] It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0046] Various embodiments for carrying out the present invention will now be described with reference to the accompanying drawings. In the following description, use of suffixes such as 'module', 'part' or 'unit' for denoting elements is only for facilitating description of the present invention and has no specific meaning by itself.

[0047] It should also be further understood that the term "and / or" used in the description of the present invention and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations .

[0048] refer to figure 1 , figure 1 It is a structural block diagram of a safe torque off circuit in a preferred embodiment of the present invention.

[0049] A preferred embodiment of the present invention ...

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Abstract

The invention discloses a safety torque turn-off circuit and system. The safety torque turn-off circuit comprises an input module, a conversion module and an output module, wherein the input module isconnected with the output module through the conversion module; the input module is used for receiving an STO signal sent by an external control system and outputting the voltage of the STO signal tothe conversion module; the conversion module is used for converting the voltage of the STO signal into a preset output voltage and outputting the preset output voltage to the output module; and the output module is used for outputting the preset output voltage to a driving board of a driver so as to control the driver to drive a motor to start or stop the start of the motor through the preset output voltage. When the input STO signal indicates that the motor is stopped, the torque can be ensured to be turned off, the motor is prevented from being started accidentally, and the safety is improved.

Description

technical field [0001] The invention relates to the technical field of electronic circuits, in particular to a safe torque off circuit and system. Background technique [0002] At present, in the plastic machinery industry, in order to prevent accidents caused by accidental starting of motors, relevant functional safety requirements are put forward for drives (frequency converters, servo drives, etc.) products. STO (Safe Torque Off, safe torque off) is one of the safety functions. The safe torque off function is to prevent the motor from generating torque when it stops, thereby improving safety performance. [0003] At present, the existing STO circuit generally adopts a switch control method, and the input STO signal is used as a control signal to control the conduction or shutdown of the switch tube inside the STO circuit. When the voltage of the input STO signal is high level (the STO signal is turned on), the switch tube is turned on, and the safe torque off circuit out...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P1/02H02H11/00
CPCH02H11/00H02P1/022
Inventor 胡浩峰
Owner NINGBO ANXIN CNC TECH
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