JPH03138278A - Safety control device for elevator - Google Patents

Abstract

PURPOSE:To allow a cage to travel as long as possible in cage running operation at the time of emergency by providing a first AND-gate for inputting safety detection signals from a single or plural safety detecting means for detecting elevator abnormality giving little interference to the travel of the cage. CONSTITUTION:In emergency operation at the time of earthquake, fire, power failure, or the like, cage travel commands ES becomes H, so that the output signals of gates 2, 5 become H, and the output signal of a gate 3 becomes H in case an overvoltage detection signal OV, a governor signal GOV and an over-travel detection signal VOT giving direct interference to the travel of a cage are all normal, as well as the output signals of gates 4, 6 become H, thereby turning a transistor 7 on. The coil 8 of an electromagnetic contactor is turned on to enable the travel of the cage. The output signal of the gate 2 remains to be H even if either one of a brake dragging signal BKS, an antistall detection signal AST and an open-phase signal DH giving little interference to the travel of the cage becomes L due to the detection of abnormality and thereby the output signal of a gate 1 becomes L.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to an elevator safety control device.
In particular, the present invention relates to improvements in safety control devices during emergency operation of elevators.

[Prior Art] FIG. 2 is a block diagram showing a general elevator control device.

In the figure, (R), (S), and (T) are the three-phase AC power supply, and (8a) to (8c) are the normally open contacts of the magnetic contactor, which are closed when the car is running and open when the car is stopped. It is something. (9) is an inverter, (10) is a three-phase induction motor that raises and lowers the car, (11) is a brake drum, (12)
A brake shoe (13) is a coil constituting a brake magnet, (14) is a normally open contact for opening and closing the brake coil, and (15) is a DC power source.

Further, FIG. 3 is a circuit diagram showing an elevator safety control device disclosed in, for example, Japanese Patent Laid-Open No. 61-254480.

In FIG. 3, (4) is an AND gate, which is a safety detection signal (BKS) from various safety detection means of the elevator;
(AST), (DH), (OV).

When (VOT) and (GOV) are all normal, the output is “
H (High)" and generates a normal command.

Safety detection signals from the various safety detection means mentioned above.

(BKS) is the brake drag signal from the detection means for detecting brake drag, and (AST) is the anti-stall signal from the anti-stall detection means for detecting that the car arrives at the destination floor within a predetermined time. Stall detection signal, (D
H) is an open phase signal from the detection means that detects that the three-phase AC power supply has an open phase, and (Ov) is the overvoltage from the detection means that detects that the DC side voltage in the inverter (9) has become overvoltage. The detection signal (VOT) is an overtravel detection signal from the detection means that detects that the car has gone past the bottom floor or the top floor, and (GOV) is the detection signal that detects that the car has reached abnormal acceleration. is the governor signal from the means.

The safety detection signals from the safety detection means of the elevator mentioned above are all "H (High)" when normal and "L" (L) when abnormal.
ow)”.

In addition, (5) is an or gate, which is a car running command (NS) during normal operation and a car running command (ES) during emergency operation.
is input. Such car running command (NS) and (ES
) becomes "H" when "running" is commanded, and becomes "L" when "stop" is commanded.

(6) is an AND gate, which is a car running command (NS),
(ES), brake drag signal (BKS) which is a safety detection signal, anti-stall detection signal (AST),
Based on the normal command “H” from the AND gate (4) that inputs the open phase signal (DH), overvoltage detection signal (OV), overshoot detection signal (VOT), and governor signal (GOV),
The output is "H" and otherwise is "L".

(8) is the contact point (8a) to (8) of the electromagnetic contactor shown in Fig. 2 above.
Coil (c), (7) is a transistor that drives this coil.

Next, the control operation for running the elevator car will be explained.

If a car running command (NS) during normal operation or a car running command (ES) during emergency operation is generated, and all elevator safety detection signals are normal, that is,
Car running command (NS) or (ES) is “H” and
Safety detection signal (BKS), (AST), (DH),
When (OV), (VOT), and (GOV) are all “H”, the output of the AND gate (4) is “H”, the output of the OR gate (5) is also “H”, and the output of the AND gate (6) is “H”. The output also becomes "H", turning on the transistor (7) and energizing the coil (8) of the electromagnetic contactor.

At the same time, a driving command is given to the inverter (9), and the normally open contact (14) is closed to rotate the three-phase induction motor (10) and cause the car to travel.

In addition, when the car is brought to a normal stop, when the car arrives at the destination floor by the above-mentioned car movement, the car movement command (N
Since S) or (ES) becomes "L", the output of the AND gate (6) becomes "L", the transistor (7) is turned off, and the coil (8) of the magnetic contactor is no longer energized. , contacts (8a) to (8C) open to cut off power supply to the inverter (9).

Next, the car running command (NS) or (ES) is generated, but the safety detection signal (BKS), (AST), (DH
), (OV), (VOT), and (GOV) are abnormal, that is, when “L” is detected, the output of the AND gate (4) becomes “L”, and the output of the AND gate (6) becomes “L”. Since the output is also "L", the transistor (7) is not turned on and the coil (8) of the magnetic contactor is not energized. Therefore, the car becomes unable to run.

[Problem to be Solved by the Invention] Since the conventional elevator control device is configured as described above, when an abnormality is detected in even a part of the safety detection signal from the safety detection means during the car operation during an emergency, for,
Since the car cannot run and the passengers cannot evacuate quickly and safely, this poses a problem to the safety of the passengers.

Therefore, the present invention provides a solution for the car running operation in an emergency.
An object of the present invention is to provide a safety control device for an elevator that allows a car to run as much as possible even if a part of the safety detection signal detects an abnormality.

[Means for Solving the Problems] An elevator safety control device according to the present invention has a first system that manually generates a safety detection signal from one or more safety detection means for detecting an abnormality in the elevator that does not significantly impede car running. a second AND gate into which a safety detection signal from one or more safety detection means for detecting a high-risk elevator abnormality that directly impedes the running of the car is input; and the first AND gate. a first OR gate into which the output signal of the first OR gate and the car running command during emergency operation are input; a third AND gate into which the output signal of the first OR gate and the output signal of the second AND gate are input; The fourth AND gate is configured to input the output signal of the third AND gate and a fourth AND gate into which a car travel command during normal operation or a car travel command during emergency operation is input.

[Function] In this invention, the safety detection signal from one or more safety detection means for detecting an abnormality in the elevator that does not significantly impede the running of the car is connected to the output signal of the first AND gate which manually outputs the safety detection signal to the car during emergency operation. The first OR gate that inputs the traveling command determines, based on its logic output signal, that the safety detection signal from one or more safety detection means detects an abnormality in the elevator that does not significantly impede the running of the car. The system also enables cage operation during emergency operations.

[Example] Examples of the present invention will be described below.

FIG. 1 is a circuit diagram showing an elevator safety control device according to an embodiment of the present invention.

In the figure, (1) is an AND gate and is the first AND gate of this embodiment, which inputs a safety detection signal from one or more safety detection means for detecting an abnormality in the elevator that does not significantly impede the running of the car. It is something. (2) is an OR gate and is the first OR gate of this embodiment, which combines the output of the AND gate (1) and the emergency car running command (ES).
) is done manually. (3) is an AND gate, which is the second AND gate of this embodiment, which detects safety from one or more safety detection means for detecting an abnormality in the elevator that directly impedes the running of the car, that is, has a high degree of danger. It is used to input signals.

(4) is an AND gate that manually inputs the output signals of OR gate (2) and AND gate (3), and is the third AND gate of this embodiment. (5) is the car running command (NS) during normal operation and emergency operation. The OR gate to which the car running command (ES) is input is the second OR gate of this embodiment, and (6) is the AND gate to which the output signals of AND gate (4) and OR gate (5) are input. The fourth and gate of the example, (8
) is a coil of contacts (8a) to (8c) of the electromagnetic contactor in FIG. 2, and (7) is a transistor that drives this coil.

Here, whether or not the safety detection signal from the safety detection means is directly related to the running of the car depends on the purpose of detecting the safety detection signal and whether there is any danger in running the car due to the safety detection signal. Or, if the safety detection signal detects an abnormality between floors, it is common to make a judgment based on the elevator control system, such as whether or not the car needs to run to the nearest floor. .

Now, for the sake of explanation, we will use the overvoltage detection signal (OV) and the governor as safety detection signals that directly impede the running of the car, that is, if these detection signals detect an abnormality, it is dangerous and the car should not run. Signal (GOV
), overshoot detection signal (VOT), and other safety detection signals such as brake drag signal (BKS), anti-stall detection signal (AST), and phase loss signal (DH) are signals that do not cause much trouble when the car is running. In other words, it is a safety detection signal with a relatively low degree of danger.

The contents of the safety detection signals from these various safety detection means are also described in the above conventional technology section, but (BKS
) is the brake drag signal from the detection means for detecting brake drag, (AST) is the anti-stall detection signal from the anti-stall detection means for detecting that the car arrives at the destination floor within a predetermined time, ( DH) is an open phase signal from the detection means that detects that the three-phase AC power supply has an open phase, and (OV) is the open phase signal from the detection means that detects that the DC side voltage in the inverter (9) has become overvoltage. The overvoltage detection signal (VOT) is an overvoltage detection signal from a detection means that detects that the car has gone past the lowest floor or the lowest floor.
(GOV) is a governor signal from a detection means for detecting abnormal acceleration of the car.

Next, the operation will be explained separately for emergency operation and normal operation.

During emergency operation, i.e. during earthquakes, fires, power outages (
In the case of emergency operation such as power supply from an emergency generator), the car run command (ES) becomes “H” during emergency operation, and therefore the output signals of or gates (2) and (5) are “H”, and the car If the overvoltage detection signal (OV), governor signal (GOV), and overshoot detection signal (VOT), which are safety detection signals that directly impede driving, are all normal, the AND gate (3) is activated.
The output signal of becomes "H". And the and gate (4
) and the output signal of the AND gate (6) both become "H", the transistor (7) is turned on, and the coil (8) of the electromagnetic contactor is turned on. Therefore, the car can run.

Currently, the brake drag signal (BKS) and anti-stall detection signal (AST) do not cause much trouble when the car is running.
, one of the safety detection signals of the open phase signal (DH) detects an abnormality in the elevator and becomes “L”, and the AND gate (1
) Even if the output signal of
The output signal of remains "H". Therefore, the output signal of the AND gate (4) and the output signal of the AND gate (6) both remain "H", and the above-mentioned brake drag signal (BKS) and anti-stall detection signal (AST), which do not cause much trouble, Even if any of the safety detection signals, such as the phase loss signal (DH), detects an abnormality in the elevator and becomes "L", the car can still run.

In addition, an overvoltage detection signal (OV), a governor signal (GOV), which is a safety detection signal that directly impedes the running of the car,
When a part of the overshoot detection signal (VOT) detects an abnormality in the elevator and becomes "L", the output signal of the AND gate (3) becomes "L", and the output signal of the AND gate (4) becomes "L". The output signal of the gate (6) also becomes "L", the transistor (7) remains off, the coil (8) of the electromagnetic contactor is not driven, and the car cannot run.

In the case of normal operation, the car running command (NS) during normal operation is "H", but the overvoltage detection signal (OV), which is a safety detection signal, the governor signal (GOV),
Overtravel detection signal (VOT).

Any one of the brake drag signal (BKS), anti-stall detection signal (AST), and phase loss signal (DH) detects an abnormality in the elevator and becomes "L", and the AND gate (1) or When the output signal of the AND gate (3) becomes "L", the output signal of the AND gate (4) and the output signal of the AND gate (6) do not become "H".
The transistor (7) is off, and the coil (8) of the electromagnetic contactor is not driven, making it impossible for the car to run.

Note that the AND gate (4) and the AND gate (6) in the above embodiment can also be configured by one AND gate with three inputs.

[Effects of the Invention] As described in Section 2 below, the elevator safety control device of the present invention detects a safety detection signal from one or more safety detection means for detecting an abnormality in the elevator that does not significantly impede the running of the car. The first OR gate, which inputs the output signal of the first AND gate and manually inputs the car travel command during emergency operation, uses one or more logic output signals to detect abnormalities in the elevator that do not significantly impede the car travel. Even if the safety detection signal from the safety detection means detects an abnormality in the elevator, the car can run during emergency operation.

Therefore, even if the elevator safety detection signal detects an abnormality in the elevator that does not significantly impede the car operation when the car is running according to the car operation command during emergency operation, despite the detection of such a safety detection signal, Since the car is made to run, the car can be operated more smoothly during emergency operation, making the elevator safer for passengers.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram showing an elevator safety control device according to an embodiment of the present invention, Fig. 2 is a circuit diagram showing a general elevator control device, and Fig. 3 is a circuit diagram showing a conventional elevator safety control device. FIG. In the figure, OV: overvoltage detection signal DH: open phase signal GOV Ni governor signal VOT: overshoot detection signal BKS Nibrake drag signal AST: anti-stall detection signal 1: first AND gate 3: second AND gate 4: second 3 AND gate 6: Fourth AND gate 2: First OR gate 5: Second OR gate. In the drawings, the same reference numerals and the same symbols indicate the same or equivalent parts.

Claims (1)

[Claims] (1) A first AND gate that inputs a safety detection signal from a safety detection means that detects abnormalities in low-risk elevators that do not directly interfere with car running, and high-risk elevators that directly interfere with car running. a second AND gate into which a safety detection signal from a safety detection means for detecting an abnormality is input; a first OR gate into which an output signal of the first AND gate and a car running command during emergency operation are input; a third AND gate into which the output signal of the first OR gate and the output signal of the second AND gate are input; and the output signal of the third AND gate and the car travel command during normal operation or the car operation command during emergency operation. 1. A safety control device for an elevator, comprising: a fourth AND gate for inputting a travel command.