200935697 六、發明說明： 【發明所屬之技術領域】 電力用設備（plant) ο 本發明係有關一種用以進行>1 吏用於^ 等之馬達的啟動控制/保護等之控制中 【先前技術】 Ο 控制中心係將每個單元匯集有主電路開閉器、 =視控制器具等之單元集合性地組入已閉鎖4 =5圖及第6圖係顯示習知的控制中心、之—例 = = 第6圈係該控制單元的斜視圓。 乐5圖所不，控制中心的益駚 ^ 段而形成複數個單元室，且於p _ ^係上下區劃成複數 Η 32。而，於單元室有面設置有開閉 元33。 Κ谷有了從别面拉出自如的控制單 =_”切換用的斷心有電 =的導通 °。而於框體％的前面侧配罟古姐 :用以顯示運轉狀況之顯示燈等:作開關 述開閉門32係設置有開口窗，物裝时具36。於前 收容於箱體31的 使在將控制單元33 作把手的操作、以及配電:^ 照例如專利文獻1}。 Π、的視/操作（參200935697 VI. Description of the invention: [Technical field to which the invention pertains] Power plant (plant) ο The present invention relates to a control for starting control/protection of a motor for use in > 】 Ο The control center is a unit that integrates the main circuit switch, the unit of the controller, etc. into the locked 4 = 5 and the 6th figure shows the conventional control center. = The sixth circle is the squint circle of the control unit. In the music 5 diagram, a plurality of unit cells are formed in the section of the control center, and the upper and lower sections of the p_^ system are divided into plural numbers Η32. Further, an opening and closing member 33 is provided on the unit chamber. Shibuya has a control list that is freely pulled from the other side = _" Switching with a broken heart and electricity = conduction °. On the front side of the frame %, the old sister: display light for displaying the operating conditions, etc. The switching opening and closing door 32 is provided with an opening window, and the object is provided with a 36. The operation for housing the control unit 33 as a handle and the power distribution in front of the casing 31 are as follows: for example, Patent Document 1}. View/operation
專利文獻1:曰本特開平10一293601號公報（第W 320346 3 200935697 頁、第1圖與第3圖） 【發明内容】 (發明所欲解決之課題） 由於以上述方式構成控制中心 ，因此在需要 〜 收容機器與零件峰護/檢查時，能以控制 行内部 ❹ ❹ 來實施。當控制單^ 33内的某個機器/零件3為單位 更換時，係以下列步驟來進行更換：在切斷^而需要 _路 breaker)35 的狀態下 33 閉門32、拉出控制單元33、將該機器/ W面的開 換正常的_，零件後、將㈣單元33再解並更 予以收容。 -入單元室内 然而，於構成控制單元的機器/零件 較長與壽命較短的機器/零件。由於近年 此雜著壽命 零件，因此與斷路器及電磁開閉器等相比來^使用電子 件中存在壽命較短的零件。因此，機器/ ，、在電子零 會變成被這些壽命短的零件限制之更換頻率::更=業 更換時都會產生要遵循上述的更換步驟之更;作辈且母次 更換作業費時的問題點。、菜，而有 此外，在拉出控制單元简更換對象的_ 以分解的作業中，由科能因為作業疏失 件= 運轉造成障礙，因此大多數的情形係例如會採取 派遣作業員來實施作業的體制，㈣使用者難 = 行更換作業之情形。 門早地進 本發明乃為了解決上述問題點而研創者，其目的在提 320346 200935697 供一種能容易地進行構成控制單元之機器/零件中壽命較 • 短的零件之更換的控制中心。 . (解決課題的手段） 本發明係一種控制中心，於箱體内區劃成多段的單元 ’ 室收容具備有負載的開閉/保護用的主電路機器與保護控 ' 制繼電器之控制單元；其中，保護控制繼電器係收容於可 從箱體的外部開閉之殼體（case)並配置於控制單元内，而 構成保護控制繼電器之零件中壽命較短的電子零件係以可 ® 裝設與取下的方式安裝於殼體内的前面側。 (發明之效果） 依據本發明的控制中心，由於將配置在控制單元内的 保護控制繼電器收容於可從箱體的外部進行開閉之殼體， 並以可裝設與取下之方式將保護控制繼電器之構成零件中 壽命較短的電子零件安裝在殼體内的前面侧，因此能從控 制中心的外部簡單地進行壽命較短的電子零件的更換，而 Q 能大幅削減更換作業時間。因此，藉由縮短更換時裝置停 止時間來降低操作損失，而能獲得成本大幅削減的效果。 此外，能容易地謀求控制中心的長壽命化。 【實施方式】 實施形態一 第1圖係本發明實施形態一的控制中心的部分正面 圖。關於控制中心的整體構成，由於與先前技術中所說明 的第5圖相等，因此省略圖示及說明。第1圖係相當於將 第5圖所示的控制中心之多段配置的控制單元33的一個予 320346 200935697 以放大之部分。 • 控制中心1係構成為將箱體2内部區劃成複數個，而 v 多段地形成在前面具有開口部的單元室3。於各單元室3 的前面開口部設置有開閉門4而能開閉單元室3，於單元 ’ 室3内收容有可拉出的控制單元5。第1圖係顯示從正面 ’ 觀看複數段設置的控制單元5中的一個控制單元5,且為 打開開閉門4而可看到收容於内部的控制單元5的前面部 之狀態。從前面能看到的機器為圖示有：用以將主電路電 ® 源予以導通/切斷之斷路器7的操作把手部、具備有電子 式繼電器或CPU等電子零件且收容於殼體之保護控制繼電 器8、以及控制線連接用的接線板9，而於這些構件的内側 復配置有電磁開閉器、控制變壓器等主電路機器、以及電 流感測器等控制機器於控制單元5的框體6内，並被框體 6予以支持固定。 於開閉門4且為與斷路器7的操作把手部對應的部分 0 以及與保護控制繼電器8的顯示部對應的部分設置有窗 4a，形成在關閉開閉門4的狀態下，能從外部操作操作把 手，並能目視確認顯示部。 此外，控制單元5係構成為於背面設置有電源緊線器 (grip)(未圖示），而可將配置在箱體2内背面侧的電力供 給用母線（未圖示）予以裝設和取下地緊束，當從單元室3 拉出控制單元5時，電源緊線器會從母線脫離。雖省略拉 出狀態的控制單元5的圖示，但成為與先前技術所說明的 第6圖類似的狀態。 6 320346 200935697 此外，收容於控制單元5的機器/零件係根據成為控 • 制對象的負載或單元的功能而不同。 v 第2圖係顯示第1圖所示的保護控制繼電器8的詳細 斜視圖。第3圖為從第2圖的ΠΙ — ΠΙ所視的剖面圖。 * 構成保護控制繼器電8的殼體係由背面殼體10與前面 ' 殼體11所構成，兩個殼體係藉由鉸鏈（hinge)12而構成為 可開閉。第2圖係顯示打開前面殼體11的狀態，當關閉殼 體11時，設置在前面殼體11的鉸鏈12的相對侧的扣合爪 ® 11a會扣合至設置在背面殼體10的扣合孔10a而形成固定。 於背面殼體10收容有基座基板13，於基座基板13搭 載有以CPU為首，用以控制電源電路、輸入電路、保護電 路等之1C等電子零件14，而構成電子式繼電器。於基座 基板13的前面側以可裝設與取下的方式安裝有顯示基板 16,該顯示基板16係搭載有用以顯示控制單元5的控制對 象的負載運轉狀況之LCD(液晶顯示器）15。如第3圖所示， q 裝設與取下係分別藉由設置在顯示基板16侧與基座基板 13側的連接器17、18來進行。第3圖（a)係顯示顯示基板 16安裝於基座基板13，且關閉前面殼體11的狀態。第3 圖（b)係顯示打開前面殼體11取出顯示基板16的過程。 為了從遠處亦可容易觀看，於LCD 15具備有背光（LED 方式）15a。此外，於顯示基板16設置有用以通知導通、切 斷、故障、錯誤等之LED顯示部20。 另一方面，於前面殼體11且為與屬於顯示基板16的 顯示部之LCD 15對應的部分形成透視窗lib，當關閉前面 7 320346 200935697 殼體11時，可從外側觀看LCD 15與LED顯示部20。此外， • 於前面殼體11設置有能從外侧操作的控制開關或模式開 、 關等開關部19(參照第1圖）。接著，如第2圖所示，於前 面殼體11的開關部19的背面侧配置有開關基板21。於開 關基板21設置有連接器22，當關閉前面殼體n時，連接 器22會與設置在背面殼體1〇侧的基座基板13的連接器 23嵌合而連接。 》 於前面殼體11内側且為與顯示基板16相對向的部分 設置有突起部llc，如第3圖⑷所示，係構成為當關閉前 面设體11_時，突起部llc會輕輕推遷顯示基板兩側部。 藉此，顯示基板16會變成三點支持而確實地固定。Patent Document 1: Japanese Unexamined Patent Publication No. Hei No. Hei No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. When it is necessary to store the equipment and parts, it can be implemented by controlling the internal ❹. When a certain machine/part 3 in the control unit 33 is replaced by a unit, the following steps are performed: in the state where the _way breaker 35 is required to be cut off, the door 32 is closed, the control unit 33 is pulled out, The machine/W surface is replaced by a normal _, after the part, the (4) unit 33 is re-dissolved and accommodated. - Into the unit. However, the machines/parts that make up the control unit are longer and have shorter life-long machines/parts. Since the life parts are mixed in recent years, there are components with short life in electronic parts compared with circuit breakers and electromagnetic switches. Therefore, the machine /, in the electronic zero will become the replacement frequency limited by these short-lived parts:: more = industry replacement will have to follow the above replacement steps; the problem of the generation and mother replacement work time . In addition, in the operation of pulling out the control unit to replace the object, the work is caused by the operation of the missing piece = operation, so most cases are, for example, dispatching an operator to carry out the work. The system, (4) the user is difficult = the case of replacement work. The present invention has been developed in order to solve the above problems, and its purpose is to provide a control center for easily replacing the parts having a shorter life in the machine/parts constituting the control unit in 320346 200935697. (Means for Solving the Problem) The present invention is a control center in which a unit that is divided into a plurality of sections in a casing accommodates a main circuit machine having a load for opening and closing/protection and a control unit for protecting the relay; The protection control relay is housed in a case that can be opened and closed from the outside of the casing and disposed in the control unit, and the electronic components having a short life in the components constituting the protection control relay are detachably mounted and removed. The method is mounted on the front side inside the housing. (Effect of the Invention) According to the control center of the present invention, the protection control relay disposed in the control unit is housed in a casing that can be opened and closed from the outside of the casing, and the protection control is performed in a detachable manner. Since the electronic components having a short life in the components of the relay are mounted on the front side of the casing, it is possible to easily replace the electronic components having a short life from the outside of the control center, and Q can greatly reduce the replacement operation time. Therefore, the operation loss can be reduced by shortening the device stop time at the time of replacement, and the effect of greatly reducing the cost can be obtained. In addition, it is possible to easily achieve a long life of the control center. [Embodiment] Embodiment 1 FIG. 1 is a partial front view of a control center according to Embodiment 1 of the present invention. Since the overall configuration of the control center is the same as that of Fig. 5 described in the prior art, the illustration and description are omitted. Fig. 1 is an enlarged view of a portion of the control unit 33 of the plurality of stages of the control center shown in Fig. 5 to 320346 200935697. • The control center 1 is configured to divide the inside of the casing 2 into a plurality of pieces, and v to form the unit cells 3 having the openings at the front. The opening and closing door 4 is provided in the front opening of each unit chamber 3 to open and close the unit chamber 3, and the control unit 5 that can be pulled out is housed in the unit's chamber 3. Fig. 1 shows a control unit 5 of the control unit 5 provided in a plurality of stages viewed from the front side, and the state in which the front portion of the control unit 5 housed inside is accommodated is opened to open the opening and closing door 4. The machine that can be seen from the front is an operation handle portion of the circuit breaker 7 for turning on/off the main circuit power source, and is provided with an electronic component such as an electronic relay or a CPU and housed in the casing. The control relay 8 and the terminal block 9 for connecting the control line are disposed, and a main circuit device such as an electromagnetic switch, a control transformer, and a control device such as a current sensor are disposed on the inner side of the member in the casing of the control unit 5 Within 6 and supported by frame 6 to fix. A window 4a is provided in the portion 0 corresponding to the operation handle portion of the circuit breaker 7 and the portion corresponding to the display portion of the protection control relay 8 in the opening and closing door 4, and is formed to be operable from the outside in a state in which the opening and closing door 4 is closed. Handle and visually confirm the display. Further, the control unit 5 is configured such that a power supply grate (not shown) is provided on the back surface, and a power supply bus bar (not shown) disposed on the back side of the casing 2 can be mounted. The ground tight bundle is removed, and when the control unit 5 is pulled out from the unit chamber 3, the power tightener is detached from the bus bar. Although the illustration of the control unit 5 in the pulled-out state is omitted, it is in a state similar to the sixth figure described in the prior art. 6 320346 200935697 In addition, the machine/parts housed in the control unit 5 differ depending on the function of the load or unit to be controlled. v Fig. 2 is a detailed perspective view showing the protection control relay 8 shown in Fig. 1. Fig. 3 is a cross-sectional view taken from the ΠΙ-ΠΙ of Fig. 2. * The casing constituting the protection control relay 8 is constituted by the rear casing 10 and the front casing 11, and the two casings are configured to be openable and closable by a hinge 12. 2 is a view showing a state in which the front casing 11 is opened, and when the casing 11 is closed, the fastening claws 11a provided on the opposite sides of the hinge 12 of the front casing 11 are fastened to the buckles provided on the rear casing 10. The hole 10a is joined to form a fixing. The base substrate 13 is housed in the rear case 10, and the electronic component 14 such as 1C, such as a power supply circuit, an input circuit, and a protection circuit, is mounted on the base substrate 13 to support an electronic relay. A display substrate 16 is mounted on the front side of the base substrate 13 so as to be mounted and detachable. The display substrate 16 is provided with an LCD (Liquid Crystal Display) 15 for displaying the load operation state of the control object of the control unit 5. As shown in Fig. 3, the q mounting and detaching systems are respectively performed by connectors 17 and 18 provided on the display substrate 16 side and the base substrate 13 side. Fig. 3(a) shows a state in which the display substrate 16 is mounted on the base substrate 13 and the front case 11 is closed. Fig. 3(b) shows the process of opening the front casing 11 to take out the display substrate 16. In order to be easily viewed from a distance, the LCD 15 is provided with a backlight (LED mode) 15a. Further, the display substrate 16 is provided with an LED display portion 20 for notifying conduction, cutting, failure, error, and the like. On the other hand, the front window 11 and the portion corresponding to the LCD 15 belonging to the display portion of the display substrate 16 form a see-through window lib, and when the front cover 7 320346 200935697 is closed, the LCD 15 and the LED display can be viewed from the outside. Department 20. Further, the front casing 11 is provided with a control switch that can be operated from the outside, or a switch unit 19 such as a mode switch (see Fig. 1). Next, as shown in Fig. 2, the switch substrate 21 is disposed on the back side of the switch portion 19 of the front casing 11. The switch substrate 22 is provided with a connector 22, and when the front case n is closed, the connector 22 is fitted and connected to the connector 23 of the base substrate 13 provided on the side of the rear case 1 side. A portion of the front housing 11 facing the display substrate 16 is provided with a protrusion portion 11c. As shown in FIG. 3(4), the protrusion portion llc is gently pushed when the front body 11_ is closed. Move the display to the sides of the substrate. Thereby, the display substrate 16 becomes a three-point support and is surely fixed.
螺栓等將形成在背面殼體10 面殼體10的侧面一端的安 ❹ 裝部1 部鎖緊固金5 n,四--.A bolt or the like is formed on the side of the side surface of the side casing 10 of the rear casing 10 to lock the fastening portion 5 n, four--.
320346 8 200935697 根鉸鏈銷25將背面殼體1〇逝< 支持構件24。當打開殼體整體:殼體11的鉸鏈部結合至 的螺栓即可如箭頭所示進行開閉。’只要卸除安裝部10b側 接著，說明在上述構成的二制中心丨 製品壽命的原因而更換收定 因為故障或 零件類時的更換作業。；：制單元5内的控制機器/320346 8 200935697 The root hinge pin 25 ejects the back housing 1 < support member 24. When the entire casing is opened, the bolt to which the hinge portion of the casing 11 is coupled can be opened and closed as indicated by the arrow. When the installation unit 10b is removed, the replacement of the product due to the life of the two-centered product of the above-described configuration will be described. ;: Control machine in unit 5 /
❹ 控制中心係集中多數個電動機等 閉、控制、保護之開閉控制舉 、戰’而進行開 信賴性。因此〜控制使 長哥命，且在定期性更換或發 干頸係设計成 新品。通常的更換作業的财^良狀騎能迅迷地更換 制單元的斷路器予以切斷、#、下述.將更換對象的控 門、拉_單元、取出對象=:單工開閉 控制單元插入原本的單元室内予以敁复 更換新品、將 然而，由於在内建的控制 命較短的電子零件，因此更振: 4中，存在製品壽 命短的電子零件能儘量簡單地推騎變短，故期望製品壽 發明中，㈣成此，在本 零件中壽命較短的電子零件予以2保4控制繼電器8的 業。 更換，以下說明該更換作 作為構成保護控制繼電器8的零件令壽命較短的電子 零件，例如可列舉LCD 15、f光⑽方式）⑹、以及⑽ ，示部20等。在本實施形態中，將這些零件財搭載於可 裝投與取下關輸板〗6。因此，町，㈣更換顯示基 320346 9 200935697 板16時的情形。 ❹ ❹ 首先，轉動成為對象的控制單元5的斷路器7的操作 把手以將電源切斷，接著’打開控制單元5前面的開閉門 4。解除保護控制繼電器8前面殼體丨丨的扣合爪部lla的 扣合’打開前面殼體11。接著如第3圖（b)的粗箭頭所示， 以連接部Π、18部將顯示基板16分離而卸除，將準備好 的新顯示基板16插入基座基板13侧的連接器18。接著關 閉前面殼體11，並關閉控制單元5前面的開閉門4。 如此’在產生保護控制繼電器8的顯示基板16的更換 作業時，由於無須從單元室3拉出控制單元5，就能簡單 地從箱體2的外部打開開閉門4與前面殼體η來進行更 換，因此可在短時間内容易地實施更換作業。因此，即使 在例如習知之需《器製造商撥出作業員來進行更換 的情況，亦由於使用者能簡單地實施更換作業，因此^ 幅減少作業時間與成本，且能延長機器壽命而提升信賴性 在習知中，由於LCD與LED係銲接於美 在需要更換時會將搭載有這些零件的整個^座^ 因此 體性地更換。然而’隸體性更換時，會成為增^整 靠性的主因。這是由於如一般所知機器的故障係初氐可 率會較高，因此由於整體更換會增加更換機器零件月故障 增加的部分會降低可靠性。此外，亦會增加因更換作而所 導致的作業疏失的機會（因連接器交換作業所導致自業而 可靠性的降低及忘記連接等之可能性等）。 、接觸 再者，在整個基座基板的整體性更換中，由於會產 10 32〇346 200935697 負責全部功能的CPU之交換、以及1/0連接器的連接與卸 - 除，因此需要充分地確認全部功能是否正確動作的輪出入 — 順序測試、以及設定確認測試（須確認數十項的設定值 機器的健全性，因此在更換作業時需要耗費相當長的時 間。近年，由於連續作業設備變多，而傾向儘可能地縮短 . 設備停止時間，因此只要能縮短停止時間即能降低作業損 失而獲得成本大幅降低的效果。 '、 在本實施形態中，由於可從外部僅更換顯示基板16而 ® 無須整體性更換，因此不會連帶更換CPU，故無須進行上 述的確認試驗，更換作業後的確認試驗僅須確認亮燈顯 不，在非常短的時間内可以結束。如上所述，該更換時間 的縮短除了單純地達到減少作業員的人事費用而獲得成本 降低效果之外，實質上因降低操作損失而達到的成本降低 效果則更大。 " 在上述的說明中，雖以搭載有附背光15a的LCD 15或 ❿LED顯示部20之顯示基板16來說明構成保護控制繼電器 的零件中壽命較短的電子零件，但並未限定於此，亦能應 用於與其他構成的機器/零件相比壽命較短的所有電子零 件。 如上所述’依據本實施形態的控制中心，由於將配置 在控制單元内的保護控制繼電器收容於可從箱體外部進行 開閉的殼體，並將保護控制繼電器的構成零件中壽命較短 的電子零件以可裝設與取下之方式安裝⑤殼體内的前面 侧，因此能容易地從控制中心的外部進行壽命較短的電子 320346 11 200935697 零件的更換，而能大幅降低更換作業時間。因此，藉由縮 ， 短更換時的裝置停止時間來降低操作損失，而能獲得成本 . 大幅降低的效果。此外，能容易地維持高可靠性的狀態， 而能謀求控制中心的長壽命化。 ' 此外，由於構成保護控制繼電器的零件中壽命較短的 ' 零件係作成搭載有用以顯示負載的運轉狀況之LCD等的顯 示基板，因此使用者亦能簡單地實施擔負顯示運轉狀況之 重要功能的顯示基板的更換，而能容易提供高可靠性的控 ❹制中心。 此外，由於收容保護控制繼電器的殼體係由固定在控 制單元框體的背面殼體、以及以可藉由鉸鏈予以開閉之方 式設置在背面殼體的前面殼體所構成，且顯示基板係藉由 連接器而以可裝設與取下之方式保持於收容在背面殼體的 基座基板，因此能從箱體外部僅打開保護控制繼電器的前 面殼體，而能容易地更換顯示基板。 Q 此外，由於於前面殼體的内側係構成為在與顯示基板 相對向的位置設置突起部，而在關閉前面殼體時顯示基板 會被突起部推壓並固定，因此在使用時能確實地保捧/固 定可裝卸的顯示基板，而能確實地連接並維持高可靠性。 由於相對於控制單元的框體以可開閉之方式來構成保 護控制繼電器的殼體整體，且共用用以開閉前面殼體的鉸 鏈以及用以開閉殼體整體的鉸鏈，因此除了上述效果外， 能提供一種構成簡單且容易進行位於殼體背面侧的機器/ 零件的安裝與更換之控制中心。 12 320346 200935697 【圖式簡單說明】 第1圖係本發明實施形態一的控制中心的部分正面 圖。 刀 第2圖係收容於第1圖的控制中心的控制單元之保護 控制繼電器的斜視圖。 第3圖（a)及（b)係從第2圖的皿—線所視的剖面圖。 第4圖係用以說明第1圖的保護控制繼電器的殼體整 體的開閉之圖。 第5圖係顯不習知的控制中心的斜視圖。 第6圖係收容於第 圖。 【主要元件符號說明】 1 控制中心 3 單元室 4a 窗 0 6 框體 8 保護控制繼電器 10 背面殼體 10b 安裝部 11a 扣合爪 He 突起部 13 基座基板 15 LCD 顯示基板 圖的控制中心的控制單元的斜視 2 箱體 4 開閉門 5 控制單元 7 斷路器 9 接線板 10a 扣合孔 11 前面殼體 lib 透視窗 12 鉸鍵 14 電子零件 15a 背光 17、18 ' 22'23連接器 320346 13 200935697 19 開關部 20 LED顯示部 21 開關基板 24 支持構件 25 敍鍵銷 ❹ 14 320346❹ The control center is equipped with a large number of motors to close, control, and protect the opening and closing control and warfare. Therefore, ~ control makes the long brother's life, and is designed to be new in the regular replacement or dry neck. The usual replacement work of the wealthy ride can quickly replace the circuit breaker of the unit to be cut off, #, the following. The replacement of the control door, pull_unit, take out object =: simplex open and close control unit inserted In the original unit, the replacement of the new product will be repeated. However, due to the built-in electronic components with short control life, it is more vibrating: 4, the electronic components with short product life can be pushed as short as possible, so It is expected that in the product life invention, (4) in this case, the electronic component having a short life in the component is controlled by the second protection 4 relay. The replacement will be described below as an electronic component having a short life as a component constituting the protection control relay 8, and examples thereof include an LCD 15 and an f-light (10) method (6), and (10), a display unit 20, and the like. In the present embodiment, these components are mounted on the removable and unloading plate 6 . Therefore, the town, (4) replaces the case when the display base 320346 9 200935697 board 16. ❹ ❹ First, the operation handle of the circuit breaker 7 of the target control unit 5 is turned to cut off the power, and then the opening and closing door 4 in front of the control unit 5 is turned on. The engagement of the engaging claw portions 11a of the front casing 解除 of the protection control relay 8 is released to open the front casing 11. Then, as shown by the thick arrow in Fig. 3(b), the display substrate 16 is separated and removed by the connecting portions Π and 18, and the prepared new display substrate 16 is inserted into the connector 18 on the base substrate 13 side. Then, the front housing 11 is closed, and the opening and closing door 4 in front of the control unit 5 is closed. Thus, when the display substrate 16 of the protection control relay 8 is replaced, since the control unit 5 is not pulled out from the unit chamber 3, the opening and closing door 4 and the front casing η can be easily opened from the outside of the casing 2. Replacement, so replacement work can be easily performed in a short time. Therefore, even in the case where, for example, the device manufacturer has to assign an operator to perform the replacement, the user can easily perform the replacement work, thereby reducing the operation time and cost, and extending the life of the machine to enhance the reliability. In the conventional case, since the LCD and the LED are soldered to the United States, the entire mounting of these components is physically replaced when the replacement is required. However, when the body is replaced, it will become the main cause of increasing the reliability. This is because, as is generally known, the failure rate of the machine is high, so the overall replacement will increase the replacement of the machine parts. In addition, there will be an increase in the chance of job loss due to replacement work (reduction in reliability due to self-service due to connector exchange operations and the possibility of forgetting to connect, etc.). In addition, in the overall replacement of the base substrate, it is necessary to fully confirm the exchange of CPUs that are responsible for all functions and the connection and unloading of the 1/0 connector in the 10 32 〇 346 200935697. Wheeling in and out of all functions correctly - sequence test and setting confirmation test (It is necessary to confirm the sanity of dozens of set value machines, so it takes a long time to replace the work. In recent years, there have been more continuous equipments However, it is preferable to shorten the equipment stop time as much as possible. Therefore, as long as the stop time can be shortened, the work loss can be reduced and the cost can be greatly reduced. In the present embodiment, the display substrate 16 can be replaced only from the outside. There is no need to replace the whole unit, so the CPU will not be replaced. Therefore, the above-mentioned confirmation test is not required. The confirmation test after the replacement operation only needs to confirm that the lighting is not visible, and can be completed in a very short time. As mentioned above, the replacement time In addition to simply reducing the personnel costs of the operator and achieving cost reduction, the The cost reduction effect achieved by reducing the operation loss is greater. " In the above description, the life of the components constituting the protection control relay is described by the display substrate 16 on which the LCD 15 with the backlight 15a or the ❿LED display portion 20 is mounted. Short electronic parts, but not limited thereto, can also be applied to all electronic parts having a shorter life than other constructed machines/parts. As described above, the control center according to the present embodiment will be disposed in The protection control relay in the control unit is housed in a casing that can be opened and closed from the outside of the casing, and the electronic components having a short life in the components of the protection control relay are mounted and removed in a casing. The front side makes it easy to replace the short-lived electronics 320346 11 200935697 parts from the outside of the control center, which can greatly reduce the replacement work time. Therefore, the operation loss is reduced by shrinking the device stop time during short replacement. And can obtain the cost. The effect is greatly reduced. In addition, it is easy to maintain a high reliability state, and can be sought In addition, the 'long-life' parts of the components that constitute the protection control relay are made of a display substrate such as an LCD that is used to display the operational status of the load. Therefore, the user can easily perform the duties. The display substrate of the important function of the operation state is replaced, and the control center for high reliability can be easily provided. Further, since the housing accommodating the protection control relay is fixed to the rear case of the control unit casing, The front case of the rear case is configured to be opened and closed by a hinge, and the display substrate is held by the connector and held by the base substrate housed in the rear case by the connector. Only the front case of the protection control relay can be opened from the outside of the case, and the display substrate can be easily replaced. Further, since the inner side of the front casing is configured to have a projection at a position facing the display substrate, the display substrate is pressed and fixed by the projection when the front casing is closed, so that it can be surely used during use. The sturdy/fixed display substrate can be securely connected and maintained with high reliability. Since the casing of the protection control relay is integrally opened and closed with respect to the casing of the control unit, and the hinge for opening and closing the front casing and the hinge for opening and closing the casing are shared, the above effects can be A control center that is simple in construction and easy to install and replace machines/parts on the back side of the casing is provided. 12 320346 200935697 BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a partial front elevational view of a control center according to a first embodiment of the present invention. Knife Fig. 2 is a perspective view of the protection control relay of the control unit housed in the control center of Fig. 1. Fig. 3 (a) and (b) are cross-sectional views taken from the dish line of Fig. 2. Fig. 4 is a view for explaining the opening and closing of the entire casing of the protection control relay of Fig. 1. Figure 5 is a perspective view of a conventional control center. Figure 6 is contained in the figure. [Main component symbol description] 1 Control center 3 Unit room 4a Window 0 6 Frame 8 Protection control relay 10 Rear case 10b Mounting part 11a Knuckle claw He protrusion 13 Base board 15 LCD Control of control panel display Strabismus 2 unit 4 open and close door 5 control unit 7 circuit breaker 9 terminal block 10a snap hole 11 front case lib see-through window 12 hinge 14 electronic part 15a backlight 17, 18 '22'23 connector 320346 13 200935697 19 Switch part 20 LED display part 21 Switch substrate 24 Support member 25 Key pin ❹ 14 320346