KR920002958Y1 - Control device of AC elevator - Google Patents

Abstract

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Description

Control device of AC elevator

1 is a general AC elevator control circuit diagram.

2 is a conventional circuit diagram.

3 is a circuit diagram of the present invention.

4 is a circuit diagram of the present invention.

* Explanation of symbols for main parts of the drawings

R ₃ -R ₁₃ : Resistor Q ₁ -Q ₂ : Transistor

AMP: Operational Amplifier AG ₁ -AG ₂ : Endgate

IG: inverter gate 2: control circuit group

BZ: Buzzer

D ₁ , D ₂ , E ₁ : contact a of the open detection relay

1, 1a, 1b: abnormal detection relay of regenerative transistor and a, b contact thereof

The present invention relates to an alternating current elevator circuit for controlling the speed of an alternating current elevator by a variable voltage variable frequency, in particular, a transistor for absorbing the power when the power is regenerated from the induction motor (IM) side by the load in the cage of the elevator. The present invention relates to an alternating current elevator control device suitable for stationary detection.

The schematic diagram of the main circuit of an alternating current elevator controlling the speed of an elevator by a conventional variable voltage and variable frequency is made a three-phase AC power source P as a DC power source by the rectifier circuit unit CON as shown in FIG. A ripple of the attenuation is smoothed by a smoothing capacitor (FC), and the smoothed DC power is made alternating by the voltage converting unit (INV) and then the AC induction motor (IM) is controlled by a variable voltage and frequency by this output. In order to control the speed of the elevator, the regenerative power processing circuit unit A can be consumed in the reverse operation and the regenerative operation generated according to the operation direction of the elevator and the cage load, especially when the regenerative power generated during the regenerative operation is more than a predetermined value. Consists of.

That is, in the conventional regenerative power processing circuit unit A, as shown in FIG. 2, when the power that is restored from the induction motor IM of FIG. 1 increases under the condition that the elevator is operating, the medium voltage of the smoothing capacitor FC is increased. When the voltage rises by the path of AA (not described in detail) and rises above the predetermined value, the transistor RT is turned on to close the contact B ₁ of the known operation command relay and the contact C ₁ of the regenerative voltage detection relay. Through power supply (Vcc) flows from B ₁ → C ₁ → resistance (R ₁ ) → base-emitter of transistor (RT), and the power that regenerated AA path is composed of resistance (RR) -transistor (RT). According to the control to limit the power to the resistance (RR).

However, according to the conventional regenerative power processing unit A, when a short accident occurs in which the transistor RT is turned on even though the regenerative power does not exceed a predetermined value, the three-phase AC power source P is connected to the rectifier circuit unit ( After rectifying and smoothing by CON and smoothing capacitor FC, the current flowing into the induction motor IM is insufficient as the current flows through the resistor RR and transistor RT, so that the load in the cage is fully loaded. In full load, the motor is not driven and acceleration is not possible.

In addition, even though the regenerative power does not exceed a predetermined value, when the regenerative power flows through the transistor RT and the resistor RR, a torque ripple occurs in the induction motor IM, which gives an uneasy lift feeling to the passenger in the cage. .

In addition, even when the regenerative power exceeds a predetermined value, in the event of an open accident in which the transistor RT is turned off, the regenerative power does not flow to the resistor RR side. (FC) burns out, burns down the rectifier circuit (CON), or burns down the switching elements of the voltage converter (INV). There was a cleft that hit the hoist ceiling or buffer.

Therefore, the present invention detects an open accident from an elevator stop to completion of door opening to solve the conventional problems as described above, and detects a short accident until the door is completely opened and closed command to lift the elevator. The purpose is to block the control circuit group so that the elevator operation can be prevented and contribute to the safety of the elevator.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 1 and FIG. 3, the device of the present invention converts an AC power source into a direct current by the rectifying circuit unit CON, and smooths the direct current by a smoothing capacitor FC, which is converted by the voltage converting unit INV. It converts into AC power of variable frequency and drives the induction motor IM by the converted AC power to control the cage, but detects the resistance RR, transistor RT and regenerative voltage at both ends of the smoothing capacitor FC. An alternating current elevator control device having a regenerative power processing circuit portion A including a relay contact C ₁ and an operation command relay a contact B ₁ ; The regenerative voltage detecting relay contacts in the contact point (C ₁₎ and the operation command relay of a contact point (B ₁₎ completed across the open door detection relay contacts (D ₁₎ and the operation command b contacts of the relay (B _2), said transistor The collector side of the RT is connected to one side (-) of the operational amplifier AMP together with the voltage divider R ₄ , and the voltage divider resistor R ₃ through the voltage divider R ₃ and R _{5 on the} other side thereof. V _B ) is applied, and the output of the associative amplifier AMP is applied to an AND gate AG ₂ through the inverter IG and to one input terminal of the other AND gate AG ₁ , respectively. The other side of the input terminal is connected to the door open completion detection contact (E ₁ ) and the door open completion detection contact (D ₂ ), each output (V _E ), (V _H ) of the AND gate (AG ₁ ), (AG ₂ ). is common for each voltage-dividing resistor _{(R 10, R 11),} (R 12, R 13) for through connection to the base of the transistor _{(Q 1), (Q 2} ), and the transistor _{(Q 1), (Q 2} ) On the collector side The transistor abnormality detection relay 1 and the buzzer BZ are connected to each other, and the self-holding a contact 1a of the relay 1 is connected to each other.

The operation relationship of the inventive device configured as described above will be described with reference to FIGS. 1 and 3.

First, the elevator the operation when there when the electric power regenerated from the motor cursor regenerative voltage detecting known almost contacts (C ₁₎ and a contact point (B ₁₎ of the operation command relay _{V cc → B 1 → C 1} → R 1 → When a current flows into R ₂ , the transistor RT is turned on through the collector resistor RR.

Therefore, the regenerated power is consumed by the resistor RR.

And the elevator stops the current to the base of a regenerative transistor (TR) the top, in the stop mode in order to detect the abnormality until the complete open door _{V cc → B 2 → D 1} → R 1 → the transistor (RT) R ₂ of the When the transistor RT is in a normal state and the transistor RT is turned on through the collector resistor RR, the output terminal V _A potential becomes 0 (low), and the voltage divider resistors R ₃ and R are caused by the voltage across the smoothing capacitor. ₅ ) The voltage V _B by V) becomes V _B > V _A , and the operational amplifier AMP output voltage V _C becomes high, and the output V _F of the inverter IG becomes low and the output V _H of the AND gate AG ₂ . Becomes low, and the transistor Q ₂ is not turned on and the regenerative transistor abnormality detection relay 1 is not turned on.

However, when the transistor RT is in an abnormal state (open accident), even if a current flows in the base of the transistor RT as described above, the transistor RT is not turned on, so that the potential is the voltage across the smooth capacitor, that is, the transistor RT. the collector-side voltage-dividing resistor (RR), (R ₄₎ divided voltage (V _a) by the (already determined by the resistance integer) is higher than the divided voltage (V _B), the operational amplifier (aMP), the output voltage V _C is The output V _{F which} becomes 0 (low) and is inverted through the inverter IG is applied to the AND gate AG ₂ as high.

At the same time, since the contact point D ₂ of the door open completion detection relay is turned on, the VG potential becomes high, and the output V _H of the AND gate AG ₂ also becomes high, and the transistor Q ₂ is conducted.

Accordingly, the transistor abnormality detection relay 1 connected to the collector side thereof is turned on while its contact a 1a is turned on so that the above-mentioned contact D ₂ is turned off so that the relay 1 is irrespective of whether the transistor Q ₂ is turned off. ) Is maintained and its b contacts 1b and 4 are turned off to block the elevator control circuit group 2.

At the same time, the buzzer BZ is turned on, and a warning sound indicates that the transistor has failed.

Then, the door is completely opened and no current is supplied to the base of the transistor RT by B → C ₁ , B ₂ → D ₁ until the closing command.

At this time, when the transistor RT is in a normal state, the transistor RT is not turned on. As described above, the V _A potential and the V _B potential become V _A > V _B and the operational amplifier AMP output voltage V _C is 0 ( Low) and the output V _E of the AND gate AG ₁ becomes 0 (low) regardless of the potential of V _D so that the transistor Q ₁ is turned off and the transistor abnormality detection relay 1 is not turned on.

In an abnormal state, however, a short-circuit accident occurs even when no current flows through the base of the transistor RT, and the V _A potential becomes 0 (low), resulting in a condition of V _A > V _B , and the output voltage V _C of the operational amplifier AMP is The high voltage V _D becomes high due to the operation of the contact E ₁ of the open completion detection relay, and the output voltage V _E of the AND gate AG ₁ becomes high and the transistor Q ₁ becomes conductive.

As a result, the transistor abnormality detection relay 1 connected to the collector side thereof is turned on and its contact 1a is turned on so that the contact point E ₁ is turned off so that the relay 1 is irrespective of whether the transistor Q ₁ is turned off. Is a self-holding operation and blocks the elevator control circuit group 2 of FIG. 4 by its b contact 1b.

At the same time, the buzzer BZ is turned on, and a warning sound indicates that the transistor has failed.

As described above, according to the present invention, whether an abnormality of a transistor is detected from an elevator stop until the door is opened, an open accident is detected, and a short accident is detected until the door is completely opened to close the elevator control circuit group. By preventing elevator operation, it is possible to contribute to safe driving.

Claims (1)

The AC power is converted into direct current by the rectifier circuit CON, and the direct current is smoothed by the smoothing capacitor FC, and this is converted into AC power of variable frequency by the voltage converting part INV and converted by the converted AC power. The induction motor IM is operated to control the cage, but the resistor RR, the transistor RT, the regenerative voltage detection relay contact C ₁ , and the operation command relay a contact B ₁ at both ends of the smoothing capacitor FC. An alternating current elevator control device having a regenerative power processing circuit portion (A) of; The regenerative voltage detecting relay contacts in the contact point (C ₁₎ and the operation command relay of a contact point (B ₁₎ completed across the open door detection relay contacts (D ₁₎ and the operation command b contacts of the relay (B _2), said transistor The collector side of the RT is connected to one side (-) of the operational amplifier AMP together with the voltage divider R ₄ , and the voltage divider resistor R ₃ through the voltage divider R ₃ and R _{5 on the} other side thereof. V _B ) is applied, and the output of the operational amplifier AMP is applied to an AND gate AG ₂ through the inverter IG and to one input terminal of the other AND gate AG ₁ , respectively. The other side of the input terminal is connected to the door open completion detection contact (E ₁ ) and the door open completion detection contact (D ₂ ), each output (V _E ), (V _H ) of the AND gate (AG ₁ ), (AG ₂ ). is common for each voltage-dividing resistor _{(R 10, R 11),} (R 12, R 13) for through connection to the base of the transistor _{(Q 1), (Q 2} ), and the transistor _{(Q 1), (Q 2} ) On the collector side And a transistor abnormality detection relay (1) and a buzzer (BZ), and a self-holding a contact (1a) of the relay (1).