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External device for preventing PLC module from being burnt out due to high input voltage

An external device, high-voltage technology, applied in the direction of emergency protection circuit device, circuit device, emergency protection circuit device for limiting overcurrent/overvoltage, etc., to achieve the effect of saving cost, easy operation, and ensuring continuity

Active Publication Date: 2011-05-25
QIDONG DONGFANG HIGH PRESSURE OIL PUMP FACTORY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For this situation, there is no better preventive measure or a good product on the market or technology to predict the possible hazards

Method used

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  • External device for preventing PLC module from being burnt out due to high input voltage
  • External device for preventing PLC module from being burnt out due to high input voltage
  • External device for preventing PLC module from being burnt out due to high input voltage

Examples

Experimental program
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Embodiment Construction

[0034] In the prior art, the connection methods adopted are as figure 1 As shown, the PLC cabinet includes a PLC rack 1. There is a PLC module 2 in the PLC rack 1. The PLC module 2 is connected to the terminal 4 inside the cabinet through the cable 3 inside the cabinet. The other end of the terminal 4 inside the cabinet is connected to the cable 5 outside the cabinet. Connection, if the high voltage 6 introduced by the cable outside the cabinet is introduced in the cable 5 outside the cabinet, the high voltage 7 entering the PLC module will inevitably be brought into the cable 3 in the cabinet so, thereby burning out the PLC module.

[0035] This embodiment includes 20 wiring units and 1 grounding unit, which are connected by connectors.

[0036] The wiring unit structure is as figure 2 As shown, it includes an insulated terminal module 14, and the insulated terminal module 14 is provided with two first conductive sheets 12 separated by a spacer 10. One side of the spacer 10...

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Abstract

The invention provides an external device for preventing a programmable logic controller (PLC) module from being burnt out due to high input voltage. The external device consists of N connection units, a grounding unit and a connecting piece, wherein N is equal to the number of cables in a cabinet of the PLC module; the cables in the cabinet are isolated from the cables outside the cabinet by using an isolating strip; after the cables outside the cabinet are electrified, high voltage enters the grounding unit through the connecting piece and is grounded through the isolating strip of the grounding unit, a first conducting strip, a light emitting diode, a load and a second conducting strip if the high voltage exists, and then the light emitting diode is lighted up, so working personnel can troubleshoot faults one by one; and if high voltage does not enter the grounding unit, the light emitting diode is not lighted up, the isolating strip is drawn out to ensure that the cables in the cabinet and the cables outside the cabinet are connected through the first conducting strip of the connection unit after a failure-free state is determined through three testing processes so as to work normally.

Description

technical field [0001] The invention belongs to the field of industrial programmable controller hardware. Background technique [0002] Because the industrial programmable logic controller (referred to as PLC) has high programming flexibility in the automatic control of production equipment, it is widely used in civil and industrial fields. However, because the PLC module is more expensive, the one-time investment is relatively large. In many production sites, after PLC wiring completes power transmission, a small number of modules or even a large number of modules are burned out by interlocking. Existing methods can only adopt two methods of disconnecting the wiring and strengthening inspection to avoid this situation. For this situation, there are no good preventive measures or a good product to predict the possible hazards in the market or technology. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide an exter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H9/04H01R9/00H01R9/16H01R9/26
Inventor 袁为银
Owner QIDONG DONGFANG HIGH PRESSURE OIL PUMP FACTORY
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