JPH0747590A - Method and device for monitoring heater of extruder - Google Patents
Method and device for monitoring heater of extruderInfo
- Publication number
- JPH0747590A JPH0747590A JP5193532A JP19353293A JPH0747590A JP H0747590 A JPH0747590 A JP H0747590A JP 5193532 A JP5193532 A JP 5193532A JP 19353293 A JP19353293 A JP 19353293A JP H0747590 A JPH0747590 A JP H0747590A
- Authority
- JP
- Japan
- Prior art keywords
- heater
- heaters
- extruder
- current
- phase power
- 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.)
- Pending
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/92—Measuring, controlling or regulating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/92704—Temperature
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92819—Location or phase of control
- B29C2948/92857—Extrusion unit
- B29C2948/92876—Feeding, melting, plasticising or pumping zones, e.g. the melt itself
- B29C2948/92895—Barrel or housing
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、押出機のヒータ監視方
法及び装置に関し、特に、２個の電流検出器を用い、複
数のヒータの中、１個のヒータのみの導通状態チェック
を順次行い、全てのヒータを監視するための新規な改良
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for monitoring a heater of an extruder, and in particular, it uses two current detectors to sequentially check the conduction state of only one of the plurality of heaters. , A new improvement for monitoring all heaters.
【０００２】[0002]
【従来の技術】従来の押出機のヒータ監視方法として
は、一般に、図６に示すように複数のヒータにそれぞれ
個別の電流検出器を取り付けて行っていた。すなわち、
押出機のシリンダを構成する複数のセグメントシリンダ
（図示せず）にそれぞれ個別に設けられたヒータＨ１〜
Ｈ８が３相電源Ｒ．Ｓ．Ｔのうちの各単相に接続され、
各ヒータＨ１〜Ｈ８にはそれぞれリレーの接点ＭＣ１〜
ＭＣ８及び電流検出器ＣＴ１〜ＣＴ８が接続されてい
る。前記各セグメントシリンダには、それぞれ電流検出
器ＣＴ１〜ＣＴ８に接続された温度制御部ＴＣ１〜ＴＣ
８、温度センサＴＥ１〜ＴＥ８及びリレーの接点ＭＣ１
〜ＭＣ８を制御するリレーのコイルＭＣ１ａ〜ＭＣ８ａ
が設けられている。従って、各ヒータＨ１〜Ｈ８に流れ
る電流をそれぞれ個別の電流検出器ＣＴ１〜ＣＴ８で検
出していた。2. Description of the Related Art As a conventional heater monitoring method for an extruder, generally, a plurality of heaters are provided with individual current detectors as shown in FIG. That is,
A plurality of segment cylinders (not shown) constituting the cylinder of the extruder, each having a heater H1 individually provided
H8 is a three-phase power supply R.V. S. Connected to each single phase of T,
Relay contacts MC1 to H1 to H8 respectively
The MC8 and the current detectors CT1 to CT8 are connected. Each of the segment cylinders has a temperature controller TC1 to TC connected to a current detector CT1 to CT8.
8, temperature sensors TE1 to TE8 and relay contact MC1
To MC8 for controlling relay coils MC1a to MC8a
Is provided. Therefore, the currents flowing through the heaters H1 to H8 are detected by the individual current detectors CT1 to CT8.
【０００３】[0003]
【発明が解決しようとする課題】前述のような従来技術
では、各ヒータにそれぞれ個別の電流検出器を取り付け
るため、電気配線が多くなり制御回路が複雑となってい
た。また、電流検出器をヒータの個数分使用するため製
造価格が上昇していた。In the prior art as described above, since individual current detectors are attached to the respective heaters, the electric wiring is increased and the control circuit is complicated. In addition, since the current detectors are used for the number of heaters, the manufacturing cost has risen.
【０００４】本発明は、以上のような課題を解決するた
めになされたもので、特に、２個の電流検出器を用い、
複数のヒータについて、個別のヒータの導通状態チェッ
クを順次行い、全てのヒータを監視するようにした押出
機のヒータ監視方法及び装置を提供することを目的とす
る。The present invention has been made to solve the above problems, and particularly uses two current detectors,
It is an object of the present invention to provide a heater monitoring method and apparatus for an extruder, which sequentially checks the conduction states of individual heaters for a plurality of heaters and monitors all the heaters.
【０００５】[0005]
【課題を解決するための手段】本発明による押出機のヒ
ータ監視方法は、押出機のシリンダを構成する複数のセ
グメントシリンダにそれぞれ個別に設けられた複数のヒ
ータにそれぞれ３相電源のうちの単相電源を接続し、電
流検出器によって各ヒータの電流を検出し、各ヒータの
導通状態を監視するようにした押出機のヒータ監視方法
において、前記押出機の各ヒータの温度制御中、時間間
隔を置いて複数のヒータの中の１個のヒータに順次通電
し、２個の電流検出器により各ヒータの導通状態を監視
する方法である。According to the heater monitoring method for an extruder according to the present invention, a plurality of heaters individually provided in a plurality of segment cylinders constituting a cylinder of the extruder are provided with a single one of three phase power supplies. In a heater monitoring method for an extruder, in which a phase power source is connected, the current of each heater is detected by a current detector, and the conduction state of each heater is monitored, during temperature control of each heater of the extruder, time intervals In this method, one of the plurality of heaters is sequentially energized, and the conduction state of each heater is monitored by two current detectors.
【０００６】本発明による押出機のヒータ監視装置は、
押出機のシリンダを構成する複数のセグメントシリンダ
にそれぞれ個別に設けられた複数のヒータにそれぞれ３
相電源のうちの単相電源を接続し、電流検出器によって
各ヒータの電流を検出し、各ヒータの導通状態を監視す
るようにした押出機のヒータ監視装置において、３相電
源(R.S.T)のうちの任意の単相電源に接続された２個の
電流検出器と、前記電流検出器が接続されたコンピュー
タ制御部とを備えた構成である。The heater monitoring device of the extruder according to the present invention is
Each of a plurality of heaters individually provided in a plurality of segment cylinders that form the cylinder of the extruder
In the heater monitoring device of the extruder, which connects the single-phase power supply of the phase power supplies, detects the current of each heater by the current detector, and monitors the conduction state of each heater, the three-phase power supply (RST) The configuration is provided with two current detectors connected to any one of the single-phase power supplies and a computer control unit to which the current detectors are connected.
【０００７】[0007]
【作用】本発明による押出機のヒータ監視方法及び装置
において、３相電源の中の任意の単相電源の各々の相に
接続された２個の電流検出器は、３相電源の任意の単相
電源に接続されたヒータについて、ヒータを接続された
単相電源の中の少なくとも１相に接続されている。３相
電源にそれぞれ任意の単相に接続された複数のヒータに
ついて、その中の１個のヒータのみに通電すると、２個
の電流検出器の中の少なくとも１個はヒータに流れる電
流を検出し、従ってヒータの導通状態を監視する。複数
のヒータについて、一定時間経過毎に複数のヒータを順
次１個づつ通電することにより、ヒータ全数の導通状態
を順次監視する。In the method and apparatus for monitoring the heater of the extruder according to the present invention, the two current detectors connected to each phase of the arbitrary single-phase power supply in the three-phase power supply are connected to the arbitrary single-phase power supply of the three-phase power supply. A heater connected to a phase power supply is connected to at least one phase of the single-phase power supply to which the heater is connected. For a plurality of heaters connected to a three-phase power source in any single phase, if only one heater is energized, at least one of the two current detectors detects the current flowing through the heater. Therefore, the heater conduction state is monitored. With respect to the plurality of heaters, the plurality of heaters are sequentially energized one by one at regular time intervals, thereby sequentially monitoring the conduction state of all the heaters.
【０００８】[0008]
【実施例】以下、図面と共に本発明による押出機のヒー
タ監視方法及び装置について詳細に説明する。なお、従
来例と同一又は同等部分には同一符号を用いて説明す
る。まず、図１において符号１で示されるものは、接手
３を介して駆動装置２に接続された減速機４に接続フラ
ンジ５を介して接続された押出機であり、この押出機１
のシリンダ７を構成する複数のセグメントシリンダ７ａ
〜７ｈにそれぞれ個別に設けられた複数のヒータＨ１〜
Ｈ８にはそれぞれ温度検出器ＴＥ１〜ＴＥ８が設けられ
ている。各ヒータＨ１〜Ｈ８は主電源３１が接続された
温度制御装置３０に接続され、各温度検出器ＴＥ１〜Ｔ
Ｅ８も温度制御装置３０に制御されている。図２は温度
制御装置３０の構成を示す具体的構成図であり、主電源
３１の３相電源Ｒ．Ｓ．Ｔの任意の単相電源例えばＲ．
Ｔの各々の相に接続された２個の電流検出器３２，３３
がコンピュータ制御部３４に接続されている。このコン
ピュータ制御部３４には各ヒータＨ１〜Ｈ８に対応して
温度検出器ＴＥ１〜ＴＥ８及びリレーのコイルＭＣ１ａ
〜ＭＣ８ａが接続され、３相電源Ｒ．Ｓ．Ｔの各単相電
源には従来例と同様に、リレー接点ＭＣ１〜ＭＣ８及び
ヒータＨ１〜Ｈ８が接続されている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A heater monitoring method and apparatus for an extruder according to the present invention will be described in detail below with reference to the drawings. It should be noted that the same or equivalent portions as those of the conventional example will be described using the same reference numerals. First, what is denoted by reference numeral 1 in FIG. 1 is an extruder connected to a speed reducer 4 connected to a drive device 2 via a joint 3 via a connection flange 5.
Segment cylinders 7a constituting the cylinder 7 of
A plurality of heaters H1 to H7 individually provided
H8 is provided with temperature detectors TE1 to TE8, respectively. Each heater H1 to H8 is connected to a temperature control device 30 to which a main power supply 31 is connected, and each temperature detector TE1 to T
E8 is also controlled by the temperature control device 30. 2 is a specific configuration diagram showing the configuration of the temperature control device 30, in which the three-phase power supply R. S. Any single phase power source of T.T.
Two current detectors 32, 33 connected to each phase of T
Are connected to the computer control unit 34. The computer controller 34 includes temperature detectors TE1 to TE8 and a relay coil MC1a corresponding to the heaters H1 to H8.
To MC8a are connected to the three-phase power supply R. S. Similarly to the conventional example, relay contacts MC1 to MC8 and heaters H1 to H8 are connected to the T single-phase power supplies.
【０００９】図３は前記制御装置３０のコンピュータ制
御部３４を示す構成図であり、複数の温度検出器ＴＥ１
〜ＴＥ８に熱電対を使用した実施例である。このため、
冷接点の温度を検出するための温度検出器（ＴＥＺ）が
温度検出器ＴＥ１〜ＴＥ８の接続部に取付けられてい
る。バスラインＢＵＳにはＣＰＵ４０，ＲＯＭ４１，Ｒ
ＡＭ４２、リレーの接点ＭＣ１〜ＭＣ８を接続したデジ
タル出力部４３、Ａ／Ｄ変換器４４及び切換信号発生器
４５が接続され、前記各温度検出器ＴＥ１〜ＴＥ８に接
続したマルチプレックス回路４６には前記Ａ／Ｄ変換器
４４及び切換信号発生器４５が接続されている。なお、
各温度検出器ＴＥ１〜ＴＥ８にはバッファーアンプ５０
が挿入されている。FIG. 3 is a block diagram showing the computer control section 34 of the control device 30, and includes a plurality of temperature detectors TE1.
~ This is an example of using a thermocouple for TE8. For this reason,
A temperature detector (TEZ) for detecting the temperature of the cold junction is attached to the connection portion of the temperature detectors TE1 to TE8. CPU40, ROM41, R on the bus line BUS
AM 42, a digital output unit 43 connected to relay contacts MC1 to MC8, an A / D converter 44 and a switching signal generator 45 are connected, and the multiplex circuit 46 connected to each of the temperature detectors TE1 to TE8 is connected to the aforesaid The A / D converter 44 and the switching signal generator 45 are connected. In addition,
A buffer amplifier 50 is provided for each of the temperature detectors TE1 to TE8.
Has been inserted.
【００１０】図４は前記コンピュータ制御部３４の動作
手順を示すフロー図である。まず、運転操作を設定６０
側として各ヒータＨ１〜Ｈ８のチャンネル指定（第１ス
テップ１００）、電流値入力（第２ステップ１０１）、
接続相入力（第３ステップ１０２）及び記憶（第４ステ
ップ１０３）を行う。なお、この操作は最初の１回のみ
行う。FIG. 4 is a flow chart showing an operation procedure of the computer control unit 34. First, set the driving operation 60
As a side, channel designation of each heater H1 to H8 (first step 100), current value input (second step 101),
Connection phase input (third step 102) and storage (fourth step 103) are performed. This operation is performed only once at the beginning.
【００１１】つぎに、運転について説明する。通常の運
転は、ＰＩＤ温度制御、すなわち、チャンネル指定（第
５ステップ１０４）、指定チャンネルの温度入力（第６
ステップ１０５）、冷点温度の入力（第７ステップ１０
６）、測定温度の算出（第８ステップ１０７）、ＰＩＤ
演算（第８ステップ１０８）及び操作量の出力（第９ス
テップ１０９）を行うが、一定時間経過毎に複数個のヒ
ータＨ１〜Ｈ８のうちの１個のヒータのみ『ＯＮ』その
他ヒータを「ＯＦＦ」（第１０ステップ１１０）とし、
この時の電流検出器３２又は３３は電流値Ｉ1を検出
し、コンピュータ制御部３４へ入力する（第１１ステッ
プ１１１）。例えば、ヒータＨＬの導通状態を確認する
には、デジタル出力部４３に接続されているリレーコイ
ルＭＣ１ａに電流を流す。これによりリレー接点ＭＣ１
は閉じる。他方、リレー接点ＭＣ１には３相電源(R.S.
T)の中の単相(R.T)が接続されている。従って、ヒータ
Ｈ１には単相ＲＴ間の電圧により、リレー接点ＭＣ１を
経由して電流が流れる。このとき電流検出器３２が電流
値Ｉ1検出し、コンピュータ制御部３４へ入力する。つ
ぎに、この電流値Ｉ1と、先に設定した各ヒータＨ１〜
Ｈ８の電流値Ｉ2及び接続相とを比較して電流値Ｉ1が正
常か否かあるいは通電か否かを判断する（第１２ステッ
プ１１２）。この、電流値Ｉ1が正常であれば警報オフ
（第１３ステップ１１３）、異常であれば警報オン（第
１４ステップ１１４）となる。次に、一定時間経過後ヒ
ータＨ２の導通状態を確認する。この場合ヒータＨ２に
は単相ＳＴ間の電圧により電流が流れ、電流検出器３３
が電流値Ｉ1を検出する。なお、３相電源の中の単相Ｔ
Ｒ間に接続されたヒータについては、２個の電流検出器
３２，３３のどちらかによって検出しても構わない。こ
のように３相電源(R.S.T)の中のいずれかの組合わせの
単相電源に接続された２個の電流検出器３２又は３３を
用いて一定時間経過毎に各ヒータＨ１〜Ｈ８について順
次行う事によりすべてのヒータＨ１〜Ｈ８の導通状態を
監視することが可能となる。また、停止させる場合は、
出力オフ（第１５ステップ１１５）で停止となる。Next, the operation will be described. Normal operation is PID temperature control, that is, channel designation (fifth step 104), designated channel temperature input (sixth).
Step 105), input of cold spot temperature (7th Step 10)
6), calculation of measured temperature (eighth step 107), PID
Calculation (8th step 108) and operation amount output (9th step 109) are performed, but only one heater among the plurality of heaters H1 to H8 is "ON" every other predetermined time, and other heaters are "OFF". (10th step 110),
The current detector 32 or 33 at this time detects the current value I 1 and inputs it to the computer controller 34 (11th step 111). For example, to confirm the conduction state of the heater HL, a current is passed through the relay coil MC1a connected to the digital output unit 43. As a result, the relay contact MC1
Closes. On the other hand, the relay contact MC1 has a 3-phase power supply (RS
Single phase (RT) in T) is connected. Therefore, a current flows through the heater H1 via the relay contact MC1 due to the voltage across the single phase RT. At this time, the current detector 32 detects the current value I 1 and inputs it to the computer controller 34. Next, this current value I 1 and each of the heaters H1 to H1 previously set
The current value I 2 of H8 and the connected phase are compared to determine whether the current value I 1 is normal or whether the current is on (12th step 112). If the current value I 1 is normal, the alarm is turned off (13th step 113), and if abnormal, the alarm is turned on (14th step 114). Next, after a certain period of time, the conduction state of the heater H2 is confirmed. In this case, a current flows through the heater H2 due to the voltage between the single-phase STs, and the current detector 33
Detects the current value I 1 . A single-phase T in the three-phase power supply
The heater connected between R may be detected by either of the two current detectors 32 and 33. As described above, the two current detectors 32 or 33 connected to the single-phase power source of any combination of the three-phase power source (RST) are used to sequentially perform the heaters H1 to H8 at regular time intervals. This makes it possible to monitor the conduction states of all the heaters H1 to H8. Also, when stopping,
When the output is turned off (15th step 115), the operation is stopped.
【００１２】さらに、図５は前述の動作の各チャンネル
ごとの時分割を示すタイミング図である。なお、複数の
ヒータについて順次行われる電流の検出は、上述の一定
時間経過毎に実施することに限定されるものではなく、
順次、任意の時間間隔を置いて検出しても良い。次の表
１の第１表は各ヒータＨ１〜Ｈ８のヒータ電流と３相
Ｒ．Ｓ．Ｔの接続相を示す表である。Further, FIG. 5 is a timing chart showing time division for each channel of the above-mentioned operation. It should be noted that the detection of the current that is sequentially performed for the plurality of heaters is not limited to being performed every time the above-described constant time elapses.
The detection may be sequentially performed at arbitrary time intervals. The following Table 1 shows the heater currents of the heaters H1 to H8 and the three-phase R.V. S. It is a table which shows the connection phase of T.
【００１３】[0013]
【表１】 [Table 1]
【００１４】[0014]
【発明の効果】本発明による押出機のヒータ監視方法及
び装置は、以上のように構成されているため、次のよう
な効果を得ることができる。すなわち、ヒータ制御回路
の主電源側に電流検出器を挿入し各ヒータのヒータ電流
をひとつづつ順次監視する。このため、電流検出器の数
が少なくなる。これに伴い、電流検出器用の電気配線も
少なくなり、押出機システムの小型化、低価格化が可能
となる。Since the method and apparatus for monitoring the heater of the extruder according to the present invention are configured as described above, the following effects can be obtained. That is, a current detector is inserted on the main power source side of the heater control circuit to sequentially monitor the heater current of each heater one by one. Therefore, the number of current detectors is reduced. Along with this, the electric wiring for the current detector is reduced, and the extruder system can be downsized and the cost can be reduced.
【図１】本発明による押出機のヒータ監視方法を適用し
た装置を示す構成図である。FIG. 1 is a configuration diagram showing an apparatus to which a heater monitoring method for an extruder according to the present invention is applied.
【図２】図１の温度制御装置の構成を示すブロック図で
ある。FIG. 2 is a block diagram showing the configuration of the temperature control device of FIG.
【図３】図２のコンピュータ制御部を示すブロック図で
ある。3 is a block diagram showing a computer control unit of FIG. 2. FIG.
【図４】図２のコンピュータ制御部の動作手順を示すフ
ロー図である。4 is a flowchart showing an operation procedure of a computer control unit in FIG.
【図５】時分割動作を示すタイミング図である。FIG. 5 is a timing chart showing a time division operation.
【図６】従来の制御装置の構成を示す構成図である。FIG. 6 is a configuration diagram showing a configuration of a conventional control device.
１ 押出機 ７ シリンダ ７ａ〜７ｈ セグメントシリンダ Ｒ．Ｓ．Ｔ(31) ３相電源 Ｈ１〜Ｈ８ ヒータ ＴＥ１〜ＴＥ８ 温度検出器 ３２，３３ 電流検出器 ３４ コンピュータ制御部 1 Extruder 7 Cylinder 7a to 7h Segment cylinder R.I. S. T (31) Three-phase power supply H1 to H8 Heater TE1 to TE8 Temperature detector 32, 33 Current detector 34 Computer controller
Claims (2)
のセグメントシリンダ(7a〜7h)にそれぞれ個別に設けら
れた複数のヒータ(H1〜H8)にそれぞれ３相電源(R.S.T)
のうちの単相電源を接続し、電流検出器によって各ヒー
タ(H1〜H8)の電流を検出し、各ヒータ(H1〜H8)の導通状
態を監視するようにした押出機のヒータ監視方法におい
て、 前記押出機(1)の各ヒータ(H1〜H8)の温度制御中、時間
間隔を置いて複数のヒータ(H1〜H8)の中の１個のヒータ
に順次通電し、２個の電流検出器(32,33)により各ヒー
タ(H1〜H8)の導通状態を監視することを特徴とする押出
機のヒータ監視方法。1. A three-phase power supply (RST) is provided to each of a plurality of heaters (H1 to H8) individually provided to a plurality of segment cylinders (7a to 7h) constituting a cylinder (7) of an extruder (1).
In the heater monitoring method of the extruder, which connects the single-phase power source, detects the current of each heater (H1 to H8) by the current detector, and monitors the conduction state of each heater (H1 to H8). While the temperature of each heater (H1 to H8) of the extruder (1) is being controlled, one heater of a plurality of heaters (H1 to H8) is sequentially energized at time intervals to detect two currents. A heater monitoring method for an extruder, characterized by monitoring the conduction state of each heater (H1 to H8) with a container (32, 33).
のセグメントシリンダ(7a〜7h)にそれぞれ個別に設けら
れた複数のヒータ(H1〜H8)にそれぞれ３相電源(R.S.T)
のうちの単相電源を接続し、電流検出器によって各ヒー
タ(H1〜H8)の電流を検出し、各ヒータ(H1〜H8)の導通状
態を監視するようにした押出機のヒータ監視装置におい
て、３相電源のうちの任意の単相電源に接続された２個
の電流検出器(32,33)と、前記電流検出器が接続された
コンピュータ制御部(34)とを備えていることを特徴とす
る押出機のヒータ監視装置。2. A plurality of heaters (H1 to H8) individually provided on a plurality of segment cylinders (7a to 7h) constituting the cylinder (7) of the extruder (1), respectively, and a three-phase power source (RST).
In the heater monitoring device of the extruder, which is connected to a single-phase power source, the current of each heater (H1 to H8) is detected by the current detector, and the conduction state of each heater (H1 to H8) is monitored. Two current detectors (32, 33) connected to an arbitrary single-phase power source of the three-phase power source, and a computer control unit (34) connected to the current detectors. Characteristic extruder monitoring device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5193532A JPH0747590A (en) | 1993-08-04 | 1993-08-04 | Method and device for monitoring heater of extruder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5193532A JPH0747590A (en) | 1993-08-04 | 1993-08-04 | Method and device for monitoring heater of extruder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0747590A true JPH0747590A (en) | 1995-02-21 |
Family
ID=16309646
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5193532A Pending JPH0747590A (en) | 1993-08-04 | 1993-08-04 | Method and device for monitoring heater of extruder |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0747590A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6381516A (en) * | 1986-09-26 | 1988-04-12 | Hitachi Ltd | Instantaneous reactive current detector |
| JPH0231716B2 (en) * | 1981-04-03 | 1990-07-16 | Ii Ai Deyuhon De Nimoasu Ando Co | |
| JPH0487177A (en) * | 1990-07-26 | 1992-03-19 | Fuji Denki Shisutetsuku Kk | Severance sensing method for delta wiring three-phase load electric heater |
| JP4093129B2 (en) * | 2003-07-01 | 2008-06-04 | 住友電装株式会社 | Electrical junction box for automobiles |
-
1993
- 1993-08-04 JP JP5193532A patent/JPH0747590A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0231716B2 (en) * | 1981-04-03 | 1990-07-16 | Ii Ai Deyuhon De Nimoasu Ando Co | |
| JPS6381516A (en) * | 1986-09-26 | 1988-04-12 | Hitachi Ltd | Instantaneous reactive current detector |
| JPH0487177A (en) * | 1990-07-26 | 1992-03-19 | Fuji Denki Shisutetsuku Kk | Severance sensing method for delta wiring three-phase load electric heater |
| JP4093129B2 (en) * | 2003-07-01 | 2008-06-04 | 住友電装株式会社 | Electrical junction box for automobiles |
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