JPH075250B2 - Elevator control device - Google Patents

Description

Description: [Industrial field of application] The present invention relates to an elevator control device provided with a safety circuit.

[Conventional technology]

In recent years, various microcomputers (hereinafter, simply referred to as “MPU”) have been developed along with the rapid development of semiconductor technology. Also, in various industrial equipment, various altitude controls are performed by using the MPU in the control unit.

Here, since the elevator also requires various complicated controls, it has been shifted to the control using an MPU as disclosed in, for example, JP-A-59-22869.

FIG. 3 is an overall block diagram of a conventional elevator control device using an MPU.

In FIG. 3, reference numeral 1 denotes an MPU, the input / output terminals of which are connected to the input / output circuit 2. Further, 3 is an input / output circuit 2
An amplifier for amplifying the output signal of the output port PO ₁ at
Reference numeral 4 denotes a three-phase AC power supply, which is a contact 14 of a relay 14 described later.
It is connected to the contact 5a of the starting relay 5 connected to the output port PO ₄ of the input / output circuit 2 via a. A motor control circuit 6 controls the output of the three-phase AC power supply 4 supplied via the contact 5a according to the output signal of the amplifier 3. The power supplied from the motor control circuit 6 to the hoisting motor 8 is detected by the current detector 7, and the output signal is output from the input / output circuit 2.
It is supplied to the output port PI ₁ of. Reference numeral 9 denotes a speed detector, which is connected to the rotation shaft of the hoisting motor 8 to detect its rotation speed, and its output signal is supplied to the input port PI ₂ of the input / output circuit 2. . Reference numeral 10 denotes an MPU operation monitoring circuit. The MPU operation monitoring circuit 10 is connected to the output port PO ₂ of the input / output circuit 2, and its output end is connected to the relay 11.

Further, 12 is a travel command switch connected to the input port PI ₃ of the input / output circuit 2, 13 is a check switch connected to the input port PI ₄ of the input / output circuit 2, and is a check switch of the MPU operation monitoring circuit 10. This is for checking the operation.

Further, 14 is a normally open contact 11a of the relay 11, a normally closed contact 16a of a terminal overshoot switch installed in the hoistway, a safety circuit output contact group 16 such as an output contact 16b of an abnormal speed detector (not shown), It is an elevator emergency stop control relay connected to the output port PO ₃ of the input / output circuit 2 via a known excitation delay circuit 17.

The excitation delay circuit 17, when the safety circuit during running detects an abnormal state, deactivates the relay 14 and makes the elevator emergency stop, even after the detection of the abnormal state is released, the elevator completely stops. This is for ensuring safety by not returning the relay 14 until the time.

In the elevator controller configured as described above,
When a start command is issued and the start relay 5 is excited, its contact 5a is closed.

Next, when the travel command switch 12 is closed, its output signal is supplied to the MPU 1 via the input / output circuit 2,
The MPU 1 executes a calculation for obtaining the difference between the output signal of the speed detector 9 and the speed reference value. The difference signal obtained by this calculation is supplied to the amplifier 3 via the input / output circuit 2 so as to be amplified and supplied to the motor control circuit 6 as a control signal.

The motor control circuit 6 controls the electric power supplied to the hoisting motor 8 in accordance with a control signal corresponding to the difference between the rotation speed of the hoisting motor 8 and the speed reference value at the present time. The rotation speed is changed according to a predetermined speed reference pattern.

When the MPU 1 detects overspeed and overcurrent, it drives the relay 14 via the input / output circuit 2 to deactivate the start relay 5 and stop the elevator in an emergency.

If the MPU1 fails for some reason, the MPU1 monitors all controls and malfunctions.
It will be very dangerous. Therefore, in the MPU control, it is necessary to monitor the operation of the MPU itself.

It is the MPU operation monitoring circuit 10 that monitors the operation of this MPU1, and if the MPU1 malfunctions, the output signal of the MPU operation monitoring circuit 10 will be cut off, so the relay 11 will be deactivated and for emergency stop control. The relay 14 will be de-energized and the elevator will be stopped.

Here, since the elevator carries a person, it is necessary to ensure safety, and accordingly, a person needs to periodically confirm that the MPU operation monitoring circuit 10 is normal.

The switch 13 is operated to make this confirmation. When the switch 13 is closed, the MPU operation monitoring circuit 1
If the MPU operation monitoring circuit 10 is normal, the same signal as when the MPU 1 malfunctions at 0 is forcibly supplied. Since 11 is deactivated, confirmation can be made.

[Problems to be Solved by the Invention] However, in the elevator control device using the MPU having the above-described configuration, the operation check of the MPU operation monitoring circuit 10 has to be periodically performed, which is troublesome. become. Moreover, even if it is automatically performed, it takes time to check the operation, and if the operation check and the elevator call overlap, the start-up is delayed and the operation efficiency is reduced.

Further, in general, the elevator control device is not powered off except during a power failure or regular inspection, and when the power is turned on, the check interval is too long, and there is a problem that safety cannot be improved.

Therefore, the present invention has an object to obtain a highly safe elevator control device capable of enabling the traveling of the elevator only when the operations of the MPU and the MPU operation monitoring circuit and the emergency stop control relay are normal. To do.

[Means for Solving Problems] An elevator control device according to the present invention is a traveling control means for performing traveling control of an elevator in response to a traveling command performed in an elevator car and a call performed in a floor, and the traveling control. An abnormality detecting means for detecting an abnormal state of the means, an emergency stop means for controlling an emergency stop of the elevator by at least the output of the abnormality detecting means, and when it is detected that the traveling command or call has not occurred for a predetermined time or more, When the emergency stop means does not operate due to the output of the forced operation means and the output of the forced operation means, the running control of the travel control means is prohibited to prevent the elevator from being started And a blocking means.

[Operation] In the present invention, when the traffic condition of the elevator is not diverged for a predetermined time, it appears several times a day, and at this time, the operations of the MPU operation monitoring circuit and the emergency stop control relay are automatically confirmed. Even if it takes some time to confirm the operation, the elevator is unlikely to be used at this time, so a start command is not issued and the start of traveling of the elevator is prohibited.

[Embodiment] An embodiment of an elevator control device according to the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of an elevator controller according to the present invention.

FIG. 2 is a flow chart showing the operation of the MPU 1 in one embodiment of the elevator control device of the present invention. In addition,
In FIG. 1, the same parts as those in FIG. 3 are denoted by the same reference numerals, and the parts different from those in FIG. 3 will be mainly described here.

As can be seen by comparing FIG. 1 with FIG.
In the figure, the circuit of FIG. 3 is additionally provided with a contact 14b and an alarm device 18.

The contact point 14b is a contact point of the emergency stop control relay 14, and by the excitation of the emergency stop control relay, the input / output circuit 2
A signal indicating that the relay 14 is operating is supplied to the input port PI ₄ of the. The alarm device 18 is connected to the output port PO ₅ of the input / output circuit 2.

Next, the operation will be described.

First, when the power is turned on, step 30 is executed, and thereafter steps 31 to 40 are repeatedly executed.

Now, the power is turned on, and in step 30, timer A, timer B, start prohibition signal, etc., which will be described later, are reset, and the initial state of the program is set. In the next procedure 31, the state of the travel command switch 12 is fetched from the input port PI ₃ of the input / output circuit 2, the presence or absence of the travel command is determined, and if there is, the procedure proceeds to step 32. In step 32, it is determined whether or not the start prohibition signal is set. If not set, go to step 40, and if set, go to step 39. After executing each program, go to the first step 31. The process returns and the series of processes is repeatedly executed.

In step 40, the start command is output to the output port PO ₄ of the input / output circuit 2, while the speed control calculation of the hoisting motor 8 is executed, and the timer A is reset. In step 39, the alarm signal is output to the output port PO ₅ of the input / output circuit 2.

On the other hand, if there is no travel command in step 31, it is determined in step 33 whether or not the predetermined time T ₁ has elapsed by the timer A. If not, the procedure returns to step 31, and this step 33 is repeatedly executed After a lapse of time T ₁ , the MPU operation monitoring circuit 10 is operated in the next step 34, that is, is controlled to a state in which an abnormality is detected, and then the process proceeds to the next step 35. In step 35, it is determined by the timer B whether or not the predetermined time T ₂ has elapsed. If the predetermined time T ₂ has not elapsed, the procedure returns to step 31, and if it has elapsed, the procedure proceeds to step 36,
The contact 14b of the emergency stop control relay 14 is taken in from the input port PI ₄ of the input / output circuit 2, and it is determined whether or not the contact 14b is closed.

Normally, the MPU operation monitoring circuit 10 operates in step 34, and the output deactivates the relay 11, which opens the contact 11a and deactivates the emergency stop control relay 14, so the procedure proceeds to step 37. . In this procedure 37, the operation of the MPU operation monitoring circuit 10 is released, the timer A and the timer B are reset, and the procedure returns to the initial procedure. That is, since it is confirmed that the operation of the MPU operation monitoring circuit 10 and the operation of the emergency stop control relay 14 are operating normally, the operating state of the MPU operation monitoring circuit 10 is released and the relay 14 is restored, Ready to drive.

The operation of the timer B in step 35 secures the time from the operation of the MPU operation monitoring circuit 10 to the operation of the relay 14, so the set time T ₂ of the timer B is set sufficiently larger than the operation time of the relay 14. There is a need to.

Here, the MPU operation monitoring circuit 10 is out of order,
If the relay 14 is in the excited state or the contact is in the ON failure for some reason, the procedure proceeds from the determination procedure 36 to the procedure 38, and the start prohibition signal is set. Then, in the next step 39, an alarm signal is output from the output port PO ₅ of the input / output circuit 2.

In this case, when the travel command is generated next time, the start prohibition signal is set, so the determination in step 32 is made, the process proceeds to step 39, and the program for generating the start command in step 40 is not executed.

Therefore, even if a running command is issued, an output signal is not generated from the output port PO ₄ of the input / output circuit 2 and the activation relay 5 is blocked from being turned on. To be informed.

That is, when the MPU operation monitoring circuit has a failure or the emergency stop control relay has an ON failure, this is detected and the elevator is not started.

In this embodiment, when the traveling command is not generated for a predetermined time, the MPU operation monitoring circuit 10 is forcibly operated, and thereby the operation of the emergency stop control relay is actually confirmed. The above check operation may be started if it is not generated for a predetermined time, or MP
Needless to say, even if U directly operates the emergency stop control relay, the same effect as that of the above embodiment can be obtained.

As described above, the elevator control device according to the present embodiment includes the travel control means for performing the travel control of the elevator, which includes the step 40 in response to the travel command performed in the elevator car and the call made in the floor in step 31, and the above-described travel. Abnormality detection means consisting of steps 33 to 35 for detecting an abnormal state of the control means, at least emergency stop means for controlling the elevator emergency stop by the output of step 36 of the abnormality detection means, the travel command or call for a predetermined time When it is detected in step 33 and step 35 that the above does not occur, the forced operation means for forcibly operating the abnormality detection means, and when the emergency stop means does not operate due to the output of the forced operation means, In 38, the traveling control of the traveling control means is prohibited, and in step 32, the activation inhibiting means for inhibiting the activation of the elevator can be provided as an embodiment of the invention.

Therefore, when the traffic condition of the elevator is not diverted for a predetermined time, it appears several times a day, and at this time MP
U The operation of the operation monitoring circuit and the emergency stop control relay is automatically confirmed. Even if it takes some time to confirm the operation, the elevator is unlikely to be used at this time, so do not issue a start command. , Prohibit the start of elevator travel. When the travel command or elevator call is not issued for a predetermined time, the MPU forcibly operates the MPU operation monitoring circuit of the safety circuit or the emergency stop control relay, and if there is no predetermined response, the start command is blocked. The safety circuit can automatically check the operation at short intervals without lowering the operation efficiency. Therefore, the safety is significantly improved as compared with the conventional one.

[Effects of the Invention] As described above, the elevator control device of the present invention appears several times a day when the service state of the elevator is not spread for a predetermined time, and at this time, the operation monitoring circuit of the microcomputer. Also, the operation of the emergency stop control is automatically confirmed, and even if it takes some time to confirm the operation, the elevator is unlikely to be used at this time, so the start command is not generated and the elevator starts running. Ban. Then, when a running command or elevator call is not generated for a predetermined time, the operation monitoring circuit of the microcomputer of the elevator safety circuit or the emergency stop control is forcibly operated, and if there is no predetermined response, the start command is generated. Therefore, the safety circuit can automatically check the operation at a short interval without lowering the driving efficiency, which is an excellent effect that the safety is significantly improved as compared with the conventional one.

Therefore, the elevator can be allowed to travel only when the operations of the operation monitoring circuit of the microcomputer and the emergency stop control relay are normal, and the safety is enhanced.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of an elevator control apparatus according to the present invention, FIG. 2 is a flow chart showing an operation of an MPU in an embodiment of an elevator control apparatus according to the present invention, and FIG. 3 is a conventional elevator. FIG. 3 is a block configuration diagram of the control device of FIG. In the figure, 1: MPU, 2: Input / output circuit 4: Three-phase AC power supply, 5: Start relay 6: Motor control circuit, 7: Current detector 8: Hoisting motor, 9: Speed detector 10: MPU operation monitoring Circuit, 11: Relay 12: Travel command switch, 14: Emergency stop control relay 17: Excitation delay circuit, 18: Alarm device. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] 1. A travel control means for controlling travel of an elevator in response to a travel command issued by an elevator car and a call made on a floor, an abnormality detection means for detecting an abnormal state of the travel control means, and at least the above abnormality. Emergency stop means for controlling the emergency stop of the elevator by the output of the detection means, and a forced operation means for forcibly operating the abnormality detection means when it is detected that the traveling command or call has not occurred for a predetermined time or more, An elevator control device, comprising: an activation blocking unit that inhibits the traveling control of the traveling control unit to block the activation of the elevator when the emergency stop unit does not operate due to the output of the forced operation unit. .