JPS6224352B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an elevator control device.

Fig. 1 shows a conventional elevator control system, in which 1 is an elevator car, 2 is a main rope for suspending the elevator car, this main rope 2 is wrapped around a sheave 3 of a hoisting machine, and the other end is A counterweight 4 is connected to the . 5 is a hoisting motor that drives the sheave 3, and 6 is a speed detector that is coupled to the motor 5 and generates a speed signal Vt proportional to its rotational speed. Further, 7 is a control circuit that processes calls from cars and landings and determines the floor to stop, etc., and 8 is a normal speed command that generates a normal speed command signal Vn for elevator acceleration/deceleration in response to signals from the control circuit 7. 9 is a terminal floor deceleration command generator that generates a terminal floor deceleration command signal Vs that is always higher than the normal speed command signal Vn; 10 is the speed command signal
The speed command switching circuit selectively outputs Vn and Vs, and when Vn≦Vs, Vn is selected as the speed command signal Vp, and when Vn>Vs, Vs is selected and output as the speed command signal Vp. 11 is the speed command signal Vp mentioned above and the speed signal
This is a speed control device that extracts the deviation from Vt and controls the speed of the electric motor 5 using this deviation signal.

In the elevator control device having the above configuration, the elevator is normally operated in a pattern of constant acceleration and deceleration according to the normal speed command signal Vn generated from the normal speed command generator 8, and is operated so as to land at the called floor. However, when car 1 approaches the terminal floor, the terminal floor deceleration command generator 9 generates a terminal floor deceleration command signal whose value is always higher than the normal speed command signal Vn.
Vs occurs. This terminal floor deceleration command signal Vs is
This is to prevent serious accidents caused by car 1 rushing above the top floor or below the bottom floor when an abnormality occurs in the normal speed command signal Vn and normal deceleration and stop is impossible. be.

Therefore, if the normal speed command generator 8 fails and Vn>Vs, the speed switching circuit 1
0, the terminal floor deceleration command signal Vs is selectively input to the speed control device 11, and this terminal floor deceleration command signal
By controlling the electric motor 5 according to Vs, the elevator car 1 is decelerated and landed on the floor.

In this way, the terminal floor deceleration command signal Vs is very important for elevator operation, so even if the terminal floor deceleration command generator 9 fails and the car reaches the terminal floor, the deceleration command signal Vs is not sufficient. If the speed does not decrease and the normal speed signal Vn also becomes abnormal, the car 1 will rush above the top floor or below the bottom floor, which is extremely dangerous.

Further, if the terminal floor deceleration command generating device 9 malfunctions and a terminal floor deceleration command signal Vs lower than the normal speed command signal Vn is output when traveling on an intermediate floor, the speed switching circuit 10 causes the speed switching circuit 10 to change Vn when VnVs to Vn> When Vs is Vs, the speed control device 1 uses the speed command signal Vp.
1, and the elevator car is driven by this speed command signal Vp.

In AC elevators, when the elevator is running at maximum speed, the motor is operated with the rated voltage applied to it in order to reduce heat generation and power consumption of the motor, and after a deceleration command is generated, the motor is operated according to the speed command. I am trying to run it, but in this case,
If the speed command signal is low when the car reaches the deceleration starting point, a speed drop will occur, resulting in a problem that the riding comfort will be significantly impaired. In addition, if the vehicle does not travel at maximum speed, it will travel at low speed in accordance with the terminal floor deceleration command signal that has become low, or in extreme cases it will stall, resulting in increased heat generation in the electric motor and the risk of burnout. .

This invention eliminates the above-mentioned drawbacks, and aims to provide an elevator control device that is safe and does not cause deterioration of ride comfort or burnout of the motor even when the terminal floor speed command generation device fails.

An embodiment of the present invention will be described below with reference to FIGS. 2 to 8.

FIG. 2 shows an example of an elevator control device according to the present invention, which includes an electric motor 5 for driving the sheave 3 of the car 1, a speed detector 6, a control circuit 7, a normal speed Command generation device 8, terminal floor deceleration command generation device 9, speed command switching circuit 10
In addition to this, a failure detection circuit 12 for detecting a failure of the terminal floor deceleration command generation device 9 is newly provided. This failure detection circuit 12 includes an output signal generated in response to the terminal floor deceleration command signal Vs from the terminal floor deceleration command generator 9 and the terminal switches 16a and 17a which operate first when the car 1 approaches the terminal floor. 9A is introduced, and the control circuit 7 also receives a conditional signal necessary for failure detection, that is, an input signal 7B that is at the "L" level when the elevator is stopped and is at the "H" level when the elevator is running. A reset signal 7C, which is a failure detection signal necessary when the power is turned on, is introduced, and an output signal 12A of the failure detection circuit 12 is input to the control circuit 7.

In FIG. 2, 13 is the top floor, and 14 is the bottom floor. In the hoistway before the top floor 13, terminal switches 16a to 16b are installed on the bottom floor 14.
There are terminal switches 17a to 17b on the hoistway in front of
are arranged side by side in the vertical direction, and these end point switches 16a to 16b and 17a to 17b
The cage is operated by engaging with a cam 15 attached to the cage 1. The end point switches 16a-16b, 17a-17b are opened when the cam 15 is engaged.

Figure 3 shows a specific circuit example of the terminal floor deceleration command generating device, which includes an operational amplifier OP, a fixed resistor Rf connected in parallel between the input and output terminals, a capacitor Cf, and a an integral adder consisting of separate fixed resistors Ra to Re connected to each other, input circuits 93a to 93d connected in parallel via the fixed resistors Ra to Rd, and a pair of diodes connected to each input terminal. D ₁ and D ₂ , D ₃ and
It consists of an OR circuit consisting of D ₄ , D ₅ and D ₆ , D ₇ and D ₈ . In addition, the diodes D ₁ and D ₂ constituting the above OR circuit are connected to end point switches 16a and 17a.
However, the terminal switch 16 is connected to the diodes D ₃ and D ₄ .
b, 17b, end point switches 16c, 17c are connected to diodes D ₅ , D ₆ , and further diodes D ₇ ,
End point switches 16d and 17d are directly connected to _D8 , and each series circuit of end point switches 16a to 16d is connected to the power source _E1 via a relay contact U that is closed while traveling in the upward direction. Each series circuit of the end point switches 17a to 17d is connected to the power source _E1 via a relay contact D which is closed during traveling in the downward direction. In addition,
_E2 is a power supply for the input circuits 93a to 93d, and the input circuits 93a to 93d output zero when the power supply _E1 is applied to their inputs, and otherwise output _E2 . Also, E ₃ is a power supply, one of the inputs of the integral adder, and a fixed resistor.
Re is connected to the operational amplifier OP.

FIG. 5 shows a specific circuit example of the failure detection circuit 12 in this invention, in which the terminal floor deceleration command signal is
By comparing Vs and reference voltage VR ₁ , Vs
The first step is to detect that the
A _second voltage comparator for detecting that Vs has increased sufficiently by comparing the terminal floor deceleration command signal Vs with the reference voltage VR ₂ .
COM ₂ and output 9 of terminal floor deceleration command generator 9
A, that is, the inverted operation is performed by the output of the input circuit 93a of the end point switches 16a and 17a that operate first when the car 1 approaches the end floor (when the end point switches 16a and 17a are open, they output "H" level). When the NOT gate NOT ₁ and the signal 7B from the control circuit 7 go to the "H" level, the monostable multivibrator MM outputs the "H" level for only to seconds, and the output of this monostable multivibrator MM performs inversion operation. Not Gate NOT ₂
and an AND gate AND 1 whose inputs are the output e ₂ of the second voltage comparator COM ₂ and the outputs _{e 3 and} e ₅ of the NOT gates NOT 1 and NOT _{2 ;}
A flip-flop FF has the output e ₄ of AND ₁ as a set input and the signal 7C from the control circuit 7 as a reset input, and the output e ₆ of this flip-flop FF and the output e ₁ of the first voltage comparator COM ₁ are connected. It consists of an AND gate AND ₂ as input.

Next, the operation of the inventive device configured as described above will be explained.

First, consider the case where car 1 is traveling upward on an intermediate floor. In this case, relay contact U is closed, and each end point switch 16a to 1
6d, 17a to 17d are also closed. Therefore, the outputs of the input circuits 93a to 93d are all zero as shown in FIG.
outputs a deceleration command signal Vs ₁ given by the following equation.

Vs ₁ = E ₃ · Rf / Re ... (1) When car 1 stops at the intermediate floor, relay contact U opens, so all outputs of input circuits 93a to 93d become E ₂ , and the final floor deceleration command signal Vs is, Vs=E ₃・Rf/Re−E ₁ (Rf/Ra+Rf/Rb+
Rf/Rc+Rf/Rd)=0 with a delay due to the integral time constant determined by resistor Rf and capacitor Cf.

Further, when restarting upward, the terminal floor deceleration command signal Vs rises with a delay according to the integral time constant, contrary to when stopped, toward Vs ₁ =E ₃ ·Rf/Re. As a result, car 1 approaches the top floor 13,
When reaching point a (see Figure 4), end point switch 1 is activated.
6a is opened, and the output of input circuit 93a becomes _E2 . Along with this, Vs decreases with a delay due to the integral time constant, with the value Vs ₂ given by equation (2) as the target value.

Vs ₂ = E ₃・Rf/Re−E ₂・Rf/Ra……(2) Next, when car 1 reaches point b, end point switch 1
6b is opened, and the terminal floor deceleration command signal is issued in the same way.
Vs will continue to decrease with Vs ₃ as the target value.

Vs ₃ = E ₃・Rf/Re−E ₂ (Rf/Ra+Rf/Rb
)...(3) Similarly, when car 1 reaches point C and point d, the terminal floor deceleration command signal Vs is Vs 4 and Vs ₄ , respectively.
The target value is 0 and the value continues to decrease.

The above explanation is for the case where the elevator car is traveling toward the top floor, but the explanation is exactly the same when the elevator car is traveling toward the lowest floor, except that relay contact D and end point switches 17a to 17d are operated. is omitted.

As described above, when the car decelerates to stop at the terminal floor (hereinafter referred to as "stopping"), the terminal floor deceleration command generating device 9 is configured so that the terminal floor deceleration command signal Vs always decreases. During the middle of the day, check that Vs is lowered, and when driving is Vs
By checking that the value has increased sufficiently, it is possible to detect failures in all components from relay contacts to end point switches, input circuits, and integral adders.

Next, the operation of the failure detection circuit 12 will be explained in FIGS. 6 to 8.
This will be explained using figures.

The output 12A of the failure detection circuit 12 is transmitted to the control circuit 7.
(details will be described later), and if the terminal floor deceleration command signal Vs is normal, it outputs "H" level, and if it is abnormal, it outputs "L" level while stopped. Therefore, if the output 12A is "H" level while stopped, the elevator can be started normally, but if the terminal floor deceleration command signal Vs is abnormal and the "L" level is output, the starting condition is is not satisfied, the next run will be prevented. The above is an overview, but it will be explained in more detail.

First, we will discuss failure detection during stoppage. When the terminal floor deceleration command signal Vs is normal, as shown in FIG. 6, when the car 1 stops at an intermediate floor, Vs becomes zero after a certain period of time has elapsed, as described above. Therefore, since Vs becomes lower than the reference voltage VR ₁ , the output e ₁ of the voltage comparator COM ₁ becomes "H", and the output e ₆ of the flip-flop FF also becomes "H" level, so the fault is detected. The output 12A of the circuit 12 becomes "H" level. In this case, the next run is possible.

Furthermore, if the terminal floor deceleration command signal Vs does not decrease even if the terminal floor deceleration command generating device 9 fails and stops, this signal Vs is larger than the reference voltage VR ₁ as shown in FIG. The output _e1 of the comparator _COM1 becomes "L" level. Therefore, the output 12A of the failure detection circuit 12 also goes to the "L" level, and since this does not satisfy the starting conditions, the elevator is not started and cannot run next time.

That is, when a failure occurs in which the terminal floor deceleration command signal Vs does not drop sufficiently, the failure detection circuit 12
Since an abnormality is detected and the next run is prevented, even if there is an abnormality in the normal speed command signal Vn,
To prevent the danger of an elevator car rushing above the top floor or below the bottom floor.

Next, we will discuss failure detection during driving.

When the elevator starts, the terminal floor deceleration command signal Vs rises to Vs ₁ after a certain period of time, as described above. At this time, when Vs ₁ exceeds the reference voltage VR ₂ , the output e ₂ of the voltage comparator COM ₂ becomes "L" as shown in Figure 7, and at the intermediate floor, due to the stop, Vs begins to decrease and becomes below VR ₂ . The output is maintained at the "L" level until Also, the elevator car approaches the terminal floor, which causes the terminal switch 16a or 1
During the stop when 7a is open, the output 12A of the failure detection circuit 12 becomes "H" level, and therefore the output _e3 of NOT gate NOT ₁ becomes "L" level, masking the output of voltage comparator COM ₂ . I try to do that.

Furthermore, when the elevator starts and the output 7B from the control circuit 7 to the failure detection circuit 12 becomes "H" level, the output of the monostable multivibrator MM becomes to
The output _e5 of NOT gate NOT ₂ becomes "L" and the voltage comparator continues until the terminal floor deceleration command signal Vs rises sufficiently.
Masking the output of COM ₂ . Therefore, under normal conditions, the output _e4 of the AND gate _AND1 is always "L" and the flip-flop FF is not set.
Its inverted output _e6 is always held at the "H" level. When the elevator stops, the output of the voltage comparator COM ₁ goes to the "H" level as described above, so the output 12A of the failure detector 12 goes to the "H" level, allowing the elevator to run next time.

As shown in FIG. 8, when the terminal floor deceleration command generating device 9 malfunctions while the elevator is running and the terminal floor deceleration command signal Vs falls below the reference voltage VR ₂ , the output e ₂ of the voltage comparator COM ₂ becomes “ Since the outputs e ₃ and e ₅ of the NOT gates NOT ₁ and NOT ₂ are also at the “H” level, the output e ₄ of the AND gate AND ₁ is also at the “H” level. As a result, the flip-flop FF is set, its inverted output _e6 goes to the "L" level, and the output 12A of the AND gate _AND2 goes to the "L" level. For this reason, even if the elevator car stops at the floor where it is scheduled to stop, the “L”
Since the level signal continues to be output to the control circuit 7,
The next run of the elevator is blocked.

The above is the terminal floor deceleration command signal due to a malfunction during driving.
This is a case where Vs has dropped, but if the failure occurs while the car is stopped, Vs will not reach the reference voltage VR ₂ even if car 1 starts running, so the output e ₂ of voltage comparator COM ₂ will be “H”. ``level, the flip-flop FF is set when the masking condition is no longer present, and the following is the same as in the above case. Therefore, even if the terminal floor deceleration command generating device 9 malfunctions and a terminal floor deceleration command signal Vs lower than the normal speed command signal Vn is generated, the malfunction detection circuit 12 detects the abnormality and prevents the next run. This prevents the train from continuing to operate with poor ride comfort or from causing accidents such as burnout of the electric motor.

In the above embodiment, independent voltage comparators were used for failure detection while stopped and for failure detection while running, but the reference voltages VR ₁ and VR ₂ for the voltage comparators were switched between running and stopped. Then, it can be realized with just one voltage comparator. In addition, in the above embodiment, even when stopped at an intermediate floor, the terminal floor deceleration command signal Vs
The terminal floor deceleration command generating device 9 is configured so that the terminal floor deceleration command generation device 9 is lowered to increase the chances of detecting a failure during a stop. Of course, it is possible to detect a failure even if the terminal floor deceleration command generating device is not such a terminal floor deceleration command generating device.

As described above, according to the present invention, it is detected that the terminal floor deceleration command signal has become smaller than a predetermined value that is less than the maximum value, and it is determined that the terminal floor deceleration command signal is abnormal. A failure detection means is provided to determine the next time the elevator is running, and this will prevent the elevator from running the next time.If the terminal floor deceleration command signal does not rise sufficiently while the car is running, the next run of the elevator car will be blocked and the ride quality will be improved. It is possible to prevent undesired operation and motor burnout accidents, and provide a safer and more reliable elevator. Moreover, in this invention,
This is different from the case where an abnormality in the terminal floor deceleration command signal can be detected as soon as the car is traveling on an intermediate floor, and therefore an abnormality in the terminal floor deceleration command signal can be detected only after the elevator enters the terminal floor area. Therefore, safety can be further improved.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a conventional elevator control device, Fig. 2 is a block diagram showing an example of an elevator control device according to the present invention, and Fig. 3 is a circuit configuration showing an example of a terminal floor deceleration command generating device according to the present invention. Figure 4 is an operational waveform diagram for explanation,
FIG. 5 is a circuit configuration diagram showing an example of a failure detection circuit in this invention, FIG. 6 is an explanatory operational waveform diagram when the terminal floor deceleration command signal is normal in this invention, and FIGS. 7 and 8 are terminal floor deceleration command signals. FIG. 7 is an explanatory operational waveform diagram when the floor deceleration command signal is abnormal. 1...Cage, 2...Main rope, 3...Sheave, 5...Electric motor,
6...Speed detector, 7...Control circuit, 8...Normal speed command generator, 9...Terminal floor deceleration command generator, 10
...Speed command switching circuit, 11...Speed control device, 12
...failure detection circuit, 13...top floor, 14...bottom floor, 15...cam, 16a-16d, 17a-17
d...End point switch.

Claims (1)

[Claims] 1. Generates a regular speed command signal for accelerating, constant speed, and decelerating operation of an elevator driven by an AC motor, and also generates a deceleration command when operating at a constant speed at the maximum speed. A normal speed command generator generates a command to apply the rated voltage until the car reaches the rated voltage, and a deceleration command signal for the terminal floor higher than the normal speed command signal is generated even when the car runs on an intermediate floor and stops. A terminal floor deceleration command generating device that generates the terminal floor deceleration command signal, and a speed command that receives the normal speed command signal and the terminal floor deceleration command signal as input, and selects and outputs the lower speed command signal. a switching device; a speed control device that controls the elevator according to the output from the speed command switching circuit; and a standard into which the terminal floor deceleration command signal is input and which is set lower than the maximum value of the terminal floor speed command signal. a comparator device that compares the input terminal floor deceleration command signal with the terminal floor deceleration command signal and outputs an output when the terminal floor deceleration command signal is smaller than the reference value; After activation, the output of the comparator is supplied after a normal time period necessary for the terminal floor deceleration command signal to exceed the reference value is supplied, and when the comparator performs the output operation, a storage device for storing it; , means for preventing the starting of the car after the car has once stopped in response to an output indicating that the output of the storage device is supplied and the comparison device remembers that the output operation has been performed; Elevator control equipment with.