CN100416999C - Method and apparatus for detecting validity of monitoring current flow of frequency converter - Google Patents
Method and apparatus for detecting validity of monitoring current flow of frequency converter Download PDFInfo
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- CN100416999C CN100416999C CNB200410077705XA CN200410077705A CN100416999C CN 100416999 C CN100416999 C CN 100416999C CN B200410077705X A CNB200410077705X A CN B200410077705XA CN 200410077705 A CN200410077705 A CN 200410077705A CN 100416999 C CN100416999 C CN 100416999C
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Abstract
The present invention relates to a detecting method and a detecting apparatus which are applied to the validity of the current flow of a static element in monitoring elevator control. In the method for detecting the validity of the monitoring current flow of a frequency converter, a current monitoring device in the frequency converter is added with induction current so that the current monitoring device can still detect current flow after the frequency converter sends out a current blocking signal, and if the frequency converter outputs a fault signal, then the monitoring function is normal, else the monitoring function is abnormal. The detecting apparatus comprises an electric wire and a current outputting apparatus, wherein the electric wire is wound on the current monitoring device of the frequency converter, and forms a closed loop with the current outputting apparatus. The detecting method of the present invention can be used for rapidly and effectively detecting whether the monitoring function of the current monitoring device in the frequency converter is normal or not, and the detecting apparatus has the characteristics of convenient operation, favorable visuality, safety, reliability, etc., and can meet the requirements of convenience, easy operation and practicality of elevator detecting fields.
Description
Technical field
The present invention relates to be applied to monitor the detection method and the checkout gear of the mobile validity of static cell electric current in the elevator control.
Background technology
From the variable frequency speed-pressure regulation elevator that early stage double-speed elevator is most widely used up till now, the elevator technology of China is quite ripe.As control device important in the elevator electric control system---frequency converter, it mainly is to use static cell elevator motor is powered and to control.Because static cell phenomenon breakdown and out of control takes place in using the static cell control procedure easily, therefore in order to guarantee the security of operation of elevator, (standard No.: mention GB7588-2003), relevant static cell must be equipped with and be used for blocking the control device that electric current flows in this static cell and the flow supervising device of blocking-up situation of electric current when being used for checking elevator at every turn to stop in the frequency converter in " the elevator manufacturing with safety standard is installed " of country promulgation.This control device system is when elevator need stop, send the electric current locking signal so that the mobile blocking-up of the electric current in the static cell, and then the parking of control elevator, supervising device then plays the effect of the mobile blocking-up situation of electric current in the monitoring static cell, therefore this supervising device is as last one barrier of elevator safety operation, and its effect is most important.Yet, in the elevator actual moving process, above-mentioned when being used for checking elevator to stop at every turn the flow supervising device of blocking-up situation of electric current still have malfunctioning phenomenon to take place, and the malfunctioning phenomenon of current monitoring device is difficult to directly detect apace by present technological means, therefore this supervising device is in case inefficacy will be buried potential safety hazard to the elevator operation.
Summary of the invention
The objective of the invention is at the problems referred to above, a kind of detection method of validity of monitoring current flow of frequency converter is provided, what it was feasible monitors the validity of monitoring current flow of above-mentioned current monitoring device effectively, with the coefficient of safety of further raising elevator operation.
Another object of the present invention is that a kind of checkout gear of realizing above-mentioned detection method further is provided.
The technical scheme of the present invention's first purpose is: the detection method of the validity of monitoring current flow of frequency converter, for the current monitoring device in the frequency converter is applied an induced current, so that still having detected electric current, frequency converter its current monitoring device after sending the electric current locking signal flows, if frequency converter output fault-signal, then monitoring function is normal; Otherwise then monitoring function is undesired.
Above-mentioned induced current is direct current or alternating current.
Above-mentioned induced current is triggered by the electric current locking signal that frequency converter sends.
The technical scheme of another purpose of the present invention is: this checkout gear comprises a wire and a current output device, and this electric wire forms the closed-loop path on the current monitoring device of frequency converter and with current output device.
Said wires can set in advance in frequency converter, and the two ends of this electric wire form two leading-out terminals on the frequency converter housing.The one movable short circuit sheet in order to two leading-out terminals of short circuit also can be set.
Above-mentioned current output device is subjected to the electric current locking signal to trigger control.
Detection method of the present invention can be fast parallel the monitoring function that detects current monitoring device in the frequency converter effectively normally whether, and that this checkout gear has is easy to operate, intuitive good and characteristics such as safe and reliable, can satisfy elevator and detect on-the-spot convenient, easy to operate and practical requirement.
Description of drawings
Fig. 1 is the control block diagram of frequency converter of the present invention;
Fig. 2 is the structure principle chart of checkout gear of the present invention;
Fig. 3 is the structure principle chart of the described trigger equipment of the embodiment of the invention.
Now the invention will be further described in conjunction with the accompanying drawings and embodiments:
Embodiment
As shown in Figure 1, frequency converter 1 has the output current supervising device and blocks the sub-D1 of current signal output end, D2.As shown in Figure 2, checkout gear of the present invention comprises current output device, a wire 2 and a movable short circuit sheet 5 that is composed in series by power supply E, load RL, ammeter A and trigger equipment 4.This electric wire 2 be in advance on the current monitoring device 3 of current monitoring device and its two ends on frequency converter 1 housing, form two leading-out terminal S1, S2, this current monitoring device 3 is an instrument transformer.Electric wire 2 forms the closed-loop path by these two leading-out terminal S1, S2 and current output device.Blocking the sub-D1 of current signal output end, D2 inserts in this trigger equipment.
As shown in Figure 3, the trigger equipment 4 of present embodiment is to be made up of light-emitting diode 41 and optical coupler 42, and the form of implementation that realizes this trigger equipment function can have multiple and be prior art, enumerates no longer one by one at this.
When needs detect the validity of monitoring current flow of frequency converter, the electric current locking signal that frequency converter sends is via blocking the sub-D1 of current signal output end, D2 output and conducting light-emitting diode 41, optical coupling device 42 is sensed conducting current output device behind the light that light-emitting diode 41 sends, have current flowing in the electric wire 2 this moment, then instrument transformer has one and senses the mobile signal conveys of electric current to the output current supervising device, if this output current supervising device can be made fault judgement, prove that then its monitoring function is normal, otherwise then be unusual, reached the purpose that function is judged.After detection is finished, two leading-out terminal S1, S2 with movable short circuit sheet 5 short circuits, are made the electric wire no current flows, the output current supervising device is impacted avoiding.
Claims (1)
1. checkout gear, be used to detect the validity of the current monitoring device of frequency converter, it is characterized in that: comprise a wire and a current output device, this electric wire sets in advance in frequency converter and on the current monitoring device of frequency converter, and the two ends of this electric wire form two leading-out terminals on the frequency converter housing; This electric wire forms the closed-loop path by these two leading-out terminals and current output device; Also comprise a movable short circuit sheet, with two leading-out terminals of short circuit; And described current output device is subjected to the electric current locking signal to trigger control.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200410077705XA CN100416999C (en) | 2004-12-28 | 2004-12-28 | Method and apparatus for detecting validity of monitoring current flow of frequency converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200410077705XA CN100416999C (en) | 2004-12-28 | 2004-12-28 | Method and apparatus for detecting validity of monitoring current flow of frequency converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1633018A CN1633018A (en) | 2005-06-29 |
| CN100416999C true CN100416999C (en) | 2008-09-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB200410077705XA Active CN100416999C (en) | 2004-12-28 | 2004-12-28 | Method and apparatus for detecting validity of monitoring current flow of frequency converter |
Country Status (1)
| Country | Link |
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| CN (1) | CN100416999C (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2405230Y (en) * | 1999-07-22 | 2000-11-08 | 林辉 | Front end tester for device locating earth-fault in dc system |
| CN2502278Y (en) * | 2001-08-02 | 2002-07-24 | 南京普天通信股份有限公司 | Power frequency current monitor |
-
2004
- 2004-12-28 CN CNB200410077705XA patent/CN100416999C/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2405230Y (en) * | 1999-07-22 | 2000-11-08 | 林辉 | Front end tester for device locating earth-fault in dc system |
| CN2502278Y (en) * | 2001-08-02 | 2002-07-24 | 南京普天通信股份有限公司 | Power frequency current monitor |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1633018A (en) | 2005-06-29 |
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| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: HITACHI ELEVATOR (CHINA) CO., LTD. Free format text: FORMER NAME: RILI ELEVATOR CO LTD, GUANGZHOU CITY |
|
| CP01 | Change in the name or title of a patent holder |
Address after: 511430 Panyu District, Guangdong, Dashi Town, stone North Industrial Zone Patentee after: Hitachi Elevator (China) Co., Ltd. Address before: 511430 Panyu District, Guangdong, Dashi Town, stone North Industrial Zone Patentee before: Rili Elevator Co., Ltd., Guangzhou City |