JP2564370B2 - Cooling device operation control device - Google Patents
Cooling device operation control deviceInfo
- Publication number
- JP2564370B2 JP2564370B2 JP63208384A JP20838488A JP2564370B2 JP 2564370 B2 JP2564370 B2 JP 2564370B2 JP 63208384 A JP63208384 A JP 63208384A JP 20838488 A JP20838488 A JP 20838488A JP 2564370 B2 JP2564370 B2 JP 2564370B2
- Authority
- JP
- Japan
- Prior art keywords
- contact
- compressor
- operation control
- cooling
- cooling device
- 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.)
- Expired - Lifetime
Links
Landscapes
- Air Conditioning Control Device (AREA)
- Devices That Are Associated With Refrigeration Equipment (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、冷却装置の保護機器、例えば、過電流継電
器、高圧，低圧圧力開閉器などが作動した場合の検出機
構に係り、特に、冷却装置の各機器を確実に遮断すると
同時に作動保護機器を検出するのに好適な運転制御回路
に関する。Description: FIELD OF THE INVENTION The present invention relates to a protection device for a cooling device, for example, a detection mechanism when an overcurrent relay, a high-pressure / low-pressure switch is operated, and more particularly to a cooling mechanism. The present invention relates to an operation control circuit suitable for surely shutting off each device of an apparatus and at the same time detecting an operation protection device.
従来の装置は、日立パッケージエアコンサービスマニ
アル（PAH−8702）に記載のように、保護装置が作動す
ると、その接点により圧縮機用電磁接触器のコイルへの
給電を遮断すると同時に、その信号をマイコンが取込ん
で回路を遮断する様になっている。As described in the Hitachi Package Air-Conditioning Service Manual (PAH-8702), the conventional device shuts off the power supply to the coil of the electromagnetic contactor for the compressor by the contact when the protective device operates, and at the same time sends the signal to the microcomputer It takes in and shuts off the circuit.
〔発明が解決しようとする課題〕 上記従来技術は冷却装置に異常が発生した場合に、マ
イクロコンピュータが異常を検知することにより、マイ
クロコンピュータからの出力信号により回路を開路して
おり、異常検出回路の不具合が有った場合などに、回路
が完全に開路されず、異常状態のままで運転が継続され
ることが有り得るという問題が有った。[Problems to be Solved by the Invention] In the above-mentioned conventional technique, when an abnormality occurs in the cooling device, the microcomputer detects the abnormality, and the circuit is opened by the output signal from the microcomputer. There is a problem that the circuit may not be completely opened and the operation may be continued in an abnormal state when there is a problem.
本発明の目的は、異常が発生した場合に、自己保持回
路により回路を完全に遮断するとともに複数有る保護装
置の接点のどれが作動したかを確実に検知することに有
る。An object of the present invention is to completely shut off a circuit by a self-holding circuit and to reliably detect which one of a plurality of contact points of a protection device is activated when an abnormality occurs.
上記目的を達成するために、本発明は、圧縮機と、凝
縮器と、膨張手段と、蒸発器とを順次配管接続し、凝縮
器に冷水等の冷却流体を供給するポンプとを有する冷却
装置の運転制御装置において、冷却装置の異常を検知し
たときに電気的に開路し、複数個が直列に接続された保
護装置の接点と、該接点にさらに直列に接続され、圧縮
機の運転及び停止を行う補助継電器と、保護装置の接点
の後段側に一次側発光ダイオードが接続されたフォトカ
ップラと、該フォトカップラの二次側のトランジスタに
キャパシタを接続し、時定数をもって変化する入力電圧
と、該入力電圧に基づき保護装置の接点の開路又は閉路
状態を検知する手段とを備えたものである。In order to achieve the above object, the present invention provides a cooling device having a compressor, a condenser, an expansion means, and an evaporator, which are sequentially connected by pipes, and a pump for supplying a cooling fluid such as cold water to the condenser. In the operation control device of No. 1, when the abnormality of the cooling device is detected, the circuit is electrically opened, and a plurality of contacts of the protection device are connected in series, and the contacts are further connected in series to operate and stop the compressor. An auxiliary relay that performs the above, a photocoupler in which a primary side light emitting diode is connected to the rear side of the contact of the protection device, a capacitor is connected to the secondary side transistor of the photocoupler, and an input voltage that changes with a time constant, And means for detecting the open or closed state of the contact of the protection device based on the input voltage.
保護装置の接点にさらに直列に補助継電器を接続する
ことにより、保護装置を含めた自己保持回路が形成され
る。自己保持回路は、補助継電器を瞬時に励磁すれば補
助継電器の接点は閉路を維持し、逆に励磁が一度でも解
かれれば確実に開路するものである。By further connecting an auxiliary relay in series with the contact of the protective device, a self-holding circuit including the protective device is formed. The self-holding circuit keeps the contact of the auxiliary relay closed when the auxiliary relay is excited instantaneously, and on the contrary, opens the circuit certainly when the excitation is released once.
これにより、保護装置が作動してその接点が開路した
ときに必ず回路を遮断することができる。よって、保護
装置の不具合が有った場合でも回路が完全に開路され
ず、異常装置のまま圧縮機の運転が継続されることがな
くなる。This ensures that the circuit is interrupted when the protective device is activated and its contacts open. Therefore, even if there is a malfunction in the protection device, the circuit is not completely opened, and the compressor does not continue to operate as an abnormal device.
また、フォトカップラは一次側発光ダイオードが保護
装置の接点の後段側に接続され、二次側のトランジスタ
にはキャパシタが接続され、時定数をもって入力電圧が
変化し、その入力電圧に基づき保護装置の接点の開路又
は閉路状態が検知される。In the photocoupler, the light emitting diode on the primary side is connected to the rear side of the contact of the protection device, the capacitor is connected to the transistor on the secondary side, and the input voltage changes with a time constant. The open or closed state of the contact is detected.
これにより、上述と同様に回路が完全に開路されない
ような状態となっても時定数より速い開路と閉路の変化
に対しては応答することがなく、保護装置の接点の作動
状態を確実に検知できる。As a result, similar to the above, even if the circuit is not completely opened, it does not respond to changes in opening and closing that are faster than the time constant, and reliably detects the operating state of the protective device contacts. it can.
以下、本発明の実施例を第１図，第２図により説明す
る。第１図は、冷却装置の運転制御路図である。制御装
置９内には、マイクロコンピュータが組込まれており、
運転操作スイッチを操作すると、スイッチが押されたこ
とを検知して停止用補助継電器７を励磁し、接点7aが閉
路する。同時に運転用補助継電器８を瞬時（約１秒）励
磁し、接点8aを閉路する信号を出力する。これにより、
補助継電器６のコイルが励磁され、その接点6aにより自
己保持回路が形成されるとともに、圧縮機10に通電され
て運転が行われる。第３図は、上記制御回路を有する冷
却装置の冷凍サイクル図である。運転が開始すると、圧
縮機10にて圧縮された冷媒は、凝縮器11、膨張弁12、蒸
発器13、圧縮機１の順路を循環して状態変化をくり返
し、蒸発器13にて水などと熱交換、冷却を行う。冷凍サ
イクル内には、一般的に、圧縮機１の吐出圧力の異常上
昇を防止するための高圧圧力開閉器14、吸入圧力の異常
低下を防止するための低圧圧力開閉器15などが組み込ま
れている。また、冷却装置の制御回路にも、圧縮機用電
動機に異常な過大電流が流れるのを防止する過電流継電
器などが接続されており、冷却装置の異常運転を検知し
て停止する様になっている。An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is an operation control path diagram of the cooling device. A microcomputer is incorporated in the control device 9,
When the operation control switch is operated, the pressing of the switch is detected, the auxiliary relay 7 for stop is excited, and the contact 7a is closed. At the same time, the auxiliary operating relay 8 is excited instantaneously (about 1 second) and a signal for closing the contact 8a is output. This allows
The coil of the auxiliary relay 6 is excited, the contact 6a forms a self-holding circuit, and the compressor 10 is energized for operation. FIG. 3 is a refrigeration cycle diagram of a cooling device having the above control circuit. When the operation is started, the refrigerant compressed by the compressor 10 circulates through the condenser 11, the expansion valve 12, the evaporator 13, and the compressor 1 in a regular manner to repeat the state change, and the evaporator 13 generates water and the like. Heat exchange and cooling. In the refrigeration cycle, generally, a high pressure switch 14 for preventing an abnormal rise in the discharge pressure of the compressor 1, a low pressure switch 15 for preventing an abnormal decrease in the suction pressure, etc. are incorporated. There is. In addition, the control circuit of the cooling device is also connected with an overcurrent relay that prevents an abnormally large current from flowing to the compressor motor, so that it will stop after detecting an abnormal operation of the cooling device. There is.
第１図において、冷却装置が正常運転しているときに
は、保護装置Ａの接点１、保護装置Ｂの接点又は閉路し
ており、補助継電器６は自己保持されており圧縮機10は
運転状態にある。ところで、冷却装置に異常が発生し、
保護装置Ｂの接点２が開路すると、補助継電器６の励磁
が解かれ、接点6aが開路し、圧縮機10が停止する。この
とき、自己保持回路に直列に挿入されたフォトカプラ５
の一次側に電流が流れなくなるためフォトカプラ５の二
次側のトランジスタがオフ状態となり、入力２の電圧
が、抵抗とキヤパシタの値により決まる時定数をもって
L0レベルからH1レベルに変化する。これを第４図に示
す。このとき、保護装置Ａの接点１は閉路しているた
め、フォトカプラ４の一次側に電流が流れており、入力
１はHiレベルのままとなっている。この状態を制御装置
９内のマイクロコンピュータが検知し、保護装置Ｂが作
動したことが検出される。次に、保護装置Ａの接点１が
開路すると、補助継電器６の自己保持がとかれ、上記説
明からわかるように、入力１には、Hiレベルの信号が入
力される。更に、入力２にも同様にHiレベルの信号が入
力される。マイクロコンピュータのソフトには、第２図
に示すフローのプログラムが組まれており、保護装置の
作動を検出するのに、入力２、入力１の順に入力レベル
をチェックしていく。入力２のレベルがHiであれば、保
護装置Ｂの接点２が作動したと検出し、入力２、入力１
の両方がHiレベルであれば保護装置Ａの接点１が作動し
たと検知する。以上の説明でわかるように、本実施例に
よれば、保護装置が作動した場合には、自己保持回路に
より、回路を確実に遮断でき、信頼性が高い、また、複
数の保護装置のどれが作動したかを検出できサービス性
が良い。また、自己保持回路に検出用フォトカプラを直
列に接続したことにより、安価に異常を検出できるなど
の効果がある。なお、保護装置の接点がもっと多く有る
場合でも回路を確実に遮断し、どの接点が開路したかを
検出できるのは言うまでもない。In FIG. 1, when the cooling device is operating normally, the contact 1 of the protection device A and the contact of the protection device B are closed or closed, the auxiliary relay 6 is self-held, and the compressor 10 is in the operating state. . By the way, an abnormality occurred in the cooling device,
When the contact 2 of the protective device B is opened, the excitation of the auxiliary relay 6 is released, the contact 6a is opened, and the compressor 10 is stopped. At this time, the photocoupler 5 inserted in series in the self-holding circuit
Since the current no longer flows to the primary side of the photocoupler, the transistor on the secondary side of the photocoupler 5 is turned off, and the voltage of the input 2 has a time constant determined by the resistance and the capacitor value.
Change from L 0 level to H 1 level. This is shown in FIG. At this time, since the contact 1 of the protection device A is closed, a current is flowing through the primary side of the photocoupler 4, and the input 1 remains at the Hi level. The microcomputer in the control device 9 detects this state, and it is detected that the protection device B has operated. Next, when the contact 1 of the protective device A is opened, the auxiliary relay 6 is self-held, and as can be seen from the above description, a Hi level signal is input to the input 1. Further, a Hi level signal is similarly input to the input 2. The program of the flow shown in FIG. 2 is incorporated in the software of the microcomputer, and the input level is checked in order of input 2 and input 1 in order to detect the operation of the protective device. If the level of the input 2 is Hi, it is detected that the contact 2 of the protective device B has actuated, and the input 2 and the input 1 are detected.
If both of them are at the Hi level, it is detected that the contact 1 of the protection device A is activated. As can be seen from the above description, according to the present embodiment, when the protective device operates, the self-holding circuit can surely cut off the circuit and has high reliability. The serviceability is good because it can detect whether it has operated. Further, by connecting the detection photocoupler in series to the self-holding circuit, there is an effect that an abnormality can be detected at low cost. Needless to say, even if there are more contacts in the protection device, it is possible to reliably break the circuit and detect which contact has opened.
〔発明の効果〕 本発明によれば、保護装置が作動した場合には確実に
圧縮機の回路を遮断できるので安全性が高い、また、ど
の保護装置が作動したかを検出できるのでサービス性が
良いといった効果がある。[Effect of the Invention] According to the present invention, when the protective device is activated, the circuit of the compressor can be surely cut off, so that the safety is high, and since it is possible to detect which protective device is activated, serviceability is improved. It has the effect of being good.
第１図は本発明の一実施例の電気回路図、第２図は、保
護装置検出方法のフローチャート、第３図は、冷凍サイ
クル図、第４図は保護装置の接点が作動した場合のタイ
ムチャートである。 1,2……保護装置の接点、３……コンデンサ、4,5……フ
ォトカプラ、６〜８……補助継電器、９……制御装置、
10……圧縮機、14……高圧圧力開閉器、15……低圧圧力
開閉器。FIG. 1 is an electric circuit diagram of an embodiment of the present invention, FIG. 2 is a flowchart of a protective device detecting method, FIG. 3 is a refrigeration cycle diagram, and FIG. 4 is a time when a contact of the protective device is activated. It is a chart. 1,2 …… Protector contact, 3 …… Capacitor, 4,5 …… Photo coupler, 6-8 …… Auxiliary relay, 9 …… Control device,
10 …… Compressor, 14 …… High pressure switch, 15 …… Low pressure switch.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 高橋 研二 茨城県土浦市神立町502番地 株式会社 日立製作所機械研究所内 (72)発明者 加藤 喬 静岡県清水市村松390番地 株式会社日 立製作所清水工場内 (56)参考文献 特開 平１−196474（ＪＰ，Ａ) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Kenji Takahashi 502 Jinrachi-cho, Tsuchiura-shi, Ibaraki Machinery Research Laboratory, Hitachi, Ltd. (56) Reference JP-A-1-196474 (JP, A)
Claims (1)
とを順次配管接続し、凝縮器に冷水等の冷却流体を供給
するポンプとを有する冷却装置の運転制御装置におい
て、 前記冷却装置の異常を検知したときに電気的に開路し、
複数個が直列に接続された保護装置の接点と、 該接点にさらに直列に接続され、前記圧縮機の運転及び
停止を行う補助継電器と、 前記保護装置の接点の後段側に一次側発光ダイオードが
接続されたフォトカップラと、 該フォトカップラの二次側のトランジスタにキャパシタ
を接続し、時定数をもって変化する入力電圧と、 該入力電圧に基づき前記保護装置の接点の開路又は閉路
状態を検知する手段と を備えたことを特徴とする冷却装置の運転制御装置。1. An operation control device for a cooling device, comprising: a compressor, a condenser, an expansion means, and an evaporator, which are sequentially pipe-connected to each other, and a pump for supplying a cooling fluid such as cold water to the condenser. When an abnormality of the cooling device is detected, it opens electrically,
A plurality of contacts of the protective device connected in series, an auxiliary relay further connected in series to the contact for operating and stopping the compressor, and a primary side light emitting diode on the rear side of the contact of the protective device. A connected photocoupler, a capacitor connected to the transistor on the secondary side of the photocoupler, an input voltage that changes with a time constant, and means for detecting the open or closed state of the contact of the protection device based on the input voltage. An operation control device for a cooling device, comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63208384A JP2564370B2 (en) | 1988-08-24 | 1988-08-24 | Cooling device operation control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63208384A JP2564370B2 (en) | 1988-08-24 | 1988-08-24 | Cooling device operation control device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0261476A JPH0261476A (en) | 1990-03-01 |
| JP2564370B2 true JP2564370B2 (en) | 1996-12-18 |
Family
ID=16555374
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63208384A Expired - Lifetime JP2564370B2 (en) | 1988-08-24 | 1988-08-24 | Cooling device operation control device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2564370B2 (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2518338B2 (en) * | 1988-02-01 | 1996-07-24 | ダイキン工業株式会社 | Abnormality display device for refrigeration equipment |
-
1988
- 1988-08-24 JP JP63208384A patent/JP2564370B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0261476A (en) | 1990-03-01 |
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