JPH0857363A - Power cable discontinuity detecting device for electrostatic spray gun with built-in high voltage generator - Google Patents
Power cable discontinuity detecting device for electrostatic spray gun with built-in high voltage generatorInfo
- Publication number
- JPH0857363A JPH0857363A JP22553394A JP22553394A JPH0857363A JP H0857363 A JPH0857363 A JP H0857363A JP 22553394 A JP22553394 A JP 22553394A JP 22553394 A JP22553394 A JP 22553394A JP H0857363 A JPH0857363 A JP H0857363A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- power supply
- high voltage
- potential difference
- power cable
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Electrostatic Spraying Apparatus (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は高電圧発生器を内蔵した
静電塗装ガンと電源とを接続する電源ケーブルの断線を
検出する装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for detecting disconnection of a power cable connecting an electrostatic coating gun having a built-in high voltage generator and a power source.
【０００２】[0002]
【従来の技術】高電圧発生器を内蔵した静電塗装ガンを
用いた静電塗装において、高電圧が停止する原因として
は、電源が切れた場合、高電圧発生器が故障した場合、
電源ケーブルが断線した場合などがあるが、従来は、高
電圧停止の原因を知らせる装置が無かった。2. Description of the Related Art In electrostatic painting using an electrostatic painting gun with a built-in high voltage generator, the causes of high voltage stoppage are as follows: when the power supply is cut off, when the high voltage generator breaks down,
In some cases, such as when the power cable was broken, there was no device to inform the cause of the high voltage stop.
【０００３】[0003]
【発明が解決しようとする課題】本発明が解決しようと
する課題は、電源ケーブルの断線をすぐに知ることがで
きず、復旧に時間がかかるということである。The problem to be solved by the present invention is that disconnection of the power cable cannot be immediately known and it takes a long time to recover.
【０００４】[0004]
【課題を解決するための手段】本発明はこのような課題
を解決するための手段として、直流電源とインバータと
の間に直列に介設した抵抗と、その抵抗の前後における
電位差を検出して増幅する差動増幅器と、その差動増幅
器の出力があらかじめ設定した設定値より小さいときに
ＯＮ信号を出力する比較器と、電源が正常に出力してい
るときにＯＮ信号を出力する電源電圧検出器と、その電
源電圧検出器と比較器の両方がＯＮ信号を出力したとき
に異常信号を出力する異常信号出力器とからなる構成と
した。As a means for solving such a problem, the present invention detects a resistor provided in series between a DC power source and an inverter and a potential difference before and after the resistor. A differential amplifier that amplifies, a comparator that outputs an ON signal when the output of the differential amplifier is smaller than a preset value, and a power supply voltage detection that outputs an ON signal when the power is normally output. And an abnormal signal output device that outputs an abnormal signal when both the power supply voltage detector and the comparator output an ON signal.
【０００５】[0005]
【発明の作用及び効果】本発明は上記構成になり、電源
ケーブルが断線すると電流が止まるため抵抗の前後の電
位差がなくなって差動増幅器の出力があらかじめ設定し
た設定値より小さくなり、比較器がＯＮ信号を出力す
る。このとき、電源が正常に出力している場合には電源
電圧検出器がＯＮ信号を出力して異常信号出力器から異
常信号が出力され、電源ケーブルの断線が検出される。The present invention has the above-described structure, and when the power cable is disconnected, the current stops and the potential difference before and after the resistor disappears, the output of the differential amplifier becomes smaller than the preset value, and the comparator Output an ON signal. At this time, when the power supply is normally output, the power supply voltage detector outputs an ON signal and the abnormal signal output device outputs an abnormal signal, and the disconnection of the power cable is detected.
【０００６】なお、電源が切れて電流が止まった場合に
は、比較器はＯＮ信号を出力するが電源電圧検出器がＯ
Ｎ信号を出力しないため、異常信号は出力されない。When the power supply is cut off and the current stops, the comparator outputs an ON signal, but the power supply voltage detector outputs O.
Since no N signal is output, no abnormal signal is output.
【０００７】[0007]
【実施例】以下、本発明の一実施例を添付図面に基づい
て説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings.
【０００８】図１は直流送電の場合を示し、１は直流電
源２を含む電源回路であって、直流を交流に変換するイ
ンバータ１４と高電圧発生器３を内蔵した静電塗装ガン
４が、電源ケーブル６によって接続されている。５は静
電塗装ガン４の高電圧出力端子である。FIG. 1 shows the case of DC power transmission, and 1 is a power supply circuit including a DC power supply 2, in which an electrostatic coating gun 4 incorporating an inverter 14 for converting DC to AC and a high voltage generator 3, It is connected by a power cable 6. 5 is a high voltage output terminal of the electrostatic coating gun 4.
【０００９】図２は交流送電の場合を示し、電源回路１
内にインバータ１４が含まれている。FIG. 2 shows the case of AC power transmission, and the power supply circuit 1
The inverter 14 is included therein.
【００１０】上記は公知の高電圧発生器内蔵ガンを備え
た静電塗装装置であるが、本実施例においては、電源２
とインバータ１４の間に抵抗７が直列に介設されてい
る。図３は電源ケーブル断線検出回路のブロック図であ
って、前記した抵抗７の差圧を検出して増幅する差動増
幅器８の出力と、あらかじめ一定の値を設定した設定器
９の出力が比較器１０に入力するように接続されてい
る。The above is an electrostatic coating apparatus equipped with a known high voltage generator built-in gun. In this embodiment, the power source 2 is used.
The resistor 7 is provided in series between the inverter 14 and the inverter 14. FIG. 3 is a block diagram of the power cable disconnection detection circuit, in which the output of the differential amplifier 8 which detects and amplifies the differential pressure of the resistor 7 is compared with the output of the setter 9 in which a predetermined value is set. Is connected to the input device 10.
【００１１】比較器１０は差動増幅器８の出力が設定器
９の設定値より小さい場合にのみＯＮ信号を出力するよ
うになっている。The comparator 10 outputs the ON signal only when the output of the differential amplifier 8 is smaller than the set value of the setter 9.
【００１２】１１は電源２が出力しているときにのみＯ
Ｎ信号を出力する電源電圧検出器であって、その出力と
比較器１０の出力がＡＮＤ回路１２に入力し、その出力
により異常信号出力器１３が作動するように接続されて
いる。11 is O only when the power source 2 is outputting.
A power supply voltage detector that outputs an N signal, the output of which and the output of the comparator 10 are input to the AND circuit 12, and the output thereof is connected so that the abnormal signal output device 13 operates.
【００１３】次に、本実施例の作動を説明する。Next, the operation of this embodiment will be described.
【００１４】電源２が正常に作動し、かつ、電源ケーブ
ル６が断線していないときは、抵抗７に電流が流れるた
め、その前後に差圧が生じ、その差圧が差動増幅器８に
より増幅されて比較器１０に入力される。その値は設定
器９に入力された設定値より大きいため比較器１０から
の出力はＯＦＦであって、電源電圧検出器１１からの出
力がＯＮであってもＡＮＤ回路１２の出力はＯＦＦであ
って、異常信号出力器１３は作動しない。When the power supply 2 operates normally and the power supply cable 6 is not broken, a current flows through the resistor 7, so that a differential pressure is generated before and after that, and the differential pressure is amplified by the differential amplifier 8. It is input to the comparator 10. Since the value is larger than the set value input to the setter 9, the output from the comparator 10 is OFF, and the output of the AND circuit 12 is OFF even if the output from the power supply voltage detector 11 is ON. Therefore, the abnormal signal output device 13 does not operate.
【００１５】電源ケーブル６が断線したときは抵抗７に
電流が流れないため、その前後の電位差がなくなって差
動増幅器８の出力が設定器９に入力された設定値より小
さくなり、比較器１０からＯＮ信号が出力される。した
がって、電源２が正常に作動して電源電圧検出器１１か
らの出力がＯＮである場合にはＡＮＤ回路１２の出力は
ＯＮとなって異常信号出力器１３が作動する。When the power cable 6 is broken, no current flows through the resistor 7, so that the potential difference before and after that is eliminated, the output of the differential amplifier 8 becomes smaller than the set value input to the setter 9, and the comparator 10 The ON signal is output from. Therefore, when the power supply 2 operates normally and the output from the power supply voltage detector 11 is ON, the output of the AND circuit 12 is ON and the abnormality signal output device 13 operates.
【００１６】電源２が切れている場合には電源電圧検出
器１１の出力はＯＦＦであるから抵抗７に電流が流れな
くても異常信号出力器１３は作動しない。When the power supply 2 is cut off, the output of the power supply voltage detector 11 is OFF, so that the abnormal signal output device 13 does not operate even if no current flows through the resistor 7.
【００１７】したがって、電源ケーブル６の断線を直ち
に知ることができる。Therefore, the disconnection of the power cable 6 can be immediately known.
【図１】本発明の一実施例の高電圧発生器内蔵ガンの電
気回路のブロック図である。FIG. 1 is a block diagram of an electric circuit of a gun with a built-in high voltage generator according to an embodiment of the present invention.
【図２】本発明の他の実施例の高電圧発生器内蔵ガンの
電気回路のブロック図である。FIG. 2 is a block diagram of an electric circuit of a gun with a built-in high voltage generator according to another embodiment of the present invention.
【図３】断線検出回路のブロック図である。FIG. 3 is a block diagram of a disconnection detection circuit.
１：電源回路 ２：直流電源 ３：高電圧発生器 ４：ガン ６：電源ケーブル ７：抵抗 ８：差動増幅器 ９：設定器 １０：比較器 １１：電源電圧検出器 １２：ＡＮＤ回路 １３：異常信号出力器 １４：インバータ 1: Power supply circuit 2: DC power supply 3: High voltage generator 4: Gun 6: Power supply cable 7: Resistor 8: Differential amplifier 9: Setting device 10: Comparator 11: Power supply voltage detector 12: AND circuit 13: Abnormal Signal output device 14: Inverter
Claims (1)
直流電源を含む電源回路とを電源ケーブルで接続した高
電圧発生器内蔵静電塗装ガンにおいて、前記直流電源と
インバータとの間に直列に介設した抵抗と、該抵抗の前
後における電位差を検出して増幅する差動増幅器と、該
差動増幅器の出力があらかじめ設定した設定値より小さ
いときにＯＮ信号を出力する比較器と、前記電源が正常
に出力しているときにＯＮ信号を出力する電源電圧検出
器と、該電源電圧検出器と前記比較器の両方がＯＮ信号
を出力したときに異常信号を出力する異常信号出力器と
からなることを特徴とする高電圧発生器内蔵静電塗装ガ
ンの電源ケーブル断線検出装置。1. An electrostatic coating gun with a built-in high voltage generator in which an electrostatic coating gun with a built-in high voltage generator and a power supply circuit including a DC power supply are connected by a power cable, and between the DC power supply and an inverter. A resistor provided in series, a differential amplifier that detects and amplifies a potential difference before and after the resistor, and a comparator that outputs an ON signal when the output of the differential amplifier is smaller than a preset value. A power supply voltage detector that outputs an ON signal when the power supply outputs normally, and an abnormal signal output device that outputs an abnormal signal when both the power supply voltage detector and the comparator output an ON signal A power cable disconnection detection device for an electrostatic coating gun with a built-in high voltage generator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22553394A JP3554903B2 (en) | 1994-08-26 | 1994-08-26 | Power cable disconnection detection device for electrostatic coating gun with built-in high voltage generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22553394A JP3554903B2 (en) | 1994-08-26 | 1994-08-26 | Power cable disconnection detection device for electrostatic coating gun with built-in high voltage generator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0857363A true JPH0857363A (en) | 1996-03-05 |
| JP3554903B2 JP3554903B2 (en) | 2004-08-18 |
Family
ID=16830794
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22553394A Expired - Fee Related JP3554903B2 (en) | 1994-08-26 | 1994-08-26 | Power cable disconnection detection device for electrostatic coating gun with built-in high voltage generator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3554903B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017169264A (en) * | 2016-03-14 | 2017-09-21 | 株式会社日立産機システム | Power conditioner and method of detecting theft of cable connected thereto |
| CN113470472A (en) * | 2021-07-23 | 2021-10-01 | 广东电网有限责任公司 | Monitoring circuit for low-voltage electrified fire-connecting practice training |
-
1994
- 1994-08-26 JP JP22553394A patent/JP3554903B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017169264A (en) * | 2016-03-14 | 2017-09-21 | 株式会社日立産機システム | Power conditioner and method of detecting theft of cable connected thereto |
| CN113470472A (en) * | 2021-07-23 | 2021-10-01 | 广东电网有限责任公司 | Monitoring circuit for low-voltage electrified fire-connecting practice training |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3554903B2 (en) | 2004-08-18 |
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