JPH02276783A - Controller of elevator - Google Patents

Abstract

PURPOSE:To secure the safety by suspending the operation of an elevator by a detection relay and suspending the operation of a controller when a versatile use programmable controller fails and by traveling a cage to the closest floor by a relay circuit part when the elevator stops between floors. CONSTITUTION:When an anomaly is generated in a versatile use programmable controller 2, the excitation of the coil 3a of an anomaly generation detecting relay 3 is released to open a contact point 3b, and the self retention circuit of the anomaly generation memory relay 13 is opened to open contact points 13a - 13c. Then, a safety relay 9 and the contactors 10 and 11 for the ascent/ descent operation are deenergized, and the operation stop control terminal 4 of the controller 2 is opened, and the operation of an elevator is abruptly suspended, and also the operation of the controller 2 is suspended. Further, when a cage stops between floors, a between-floor stop detecting relay is energized after a prescribed time, and the all-time opened contact points 15a - 15c are opened to turn ON the safety relay 9 again, and the cage is travelled to the closest door opening zone, and the all-time opened contact points 15a - 15c are opened, and the cage is stopped in the door opening zone.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to an elevator control device, and more particularly to an elevator control device using a general-purpose programmable controller.

[Conventional technology]

Elevator control devices that have been commonly used in the past are constructed by combining various circuits, as shown, for example, in Japanese Patent Application Laid-Open No. 61-254474. Even after the elevator control device is installed, the specifications of the elevator control device are often forced to be changed depending on the customer's specifications. Modifications due to specification changes will be made several times during the life of the elevator system. In this case, if the control circuit is constituted by a relay circuit, it will be necessary to add a relay and change the wiring every time the control circuit is modified, and accordingly, the modification will take a long time. Furthermore, depending on the number of additional relays, it becomes impossible to mount them in the control panel, so it becomes necessary to add a smaller control panel or replace the control panel with a larger one. As a solution to the second problem, it has been proposed to use a general-purpose programmable controller as part of the elevator control device. By using such a general-purpose programmable controller, elevator control devices with a relay circuit configuration require the addition of relays and wiring changes, whereas the general-purpose programmable controller is housed within the controller. Since it is only necessary to change the control program, it is possible to significantly shorten the modification time. Furthermore, even if the specifications are changed, the implementation space will not change.

[Problem to be solved by the invention]

Conventional elevator control devices are configured as described above, so if a general-purpose programmable controller is used as an elevator control device, there will be problems such as safety in the event of a failure, so it is not possible to put it into practical use as is. The reality is that it is not possible. This invention was made to solve the above-mentioned problems, and provides an elevator control device that can sufficiently ensure safety even when a general-purpose programmable controller is used as the elevator control device. The goal is to provide the following.

[Means to solve the problem]

In the elevator control device according to the present invention, when a general-purpose programmable controller malfunctions, a relay that detects the malfunction operates an elevator safety relay,
Immediately stops the operation of the elevator, and also reliably stops the operation of the general-purpose programmable controller, and when the elevator stops between floors, removes the general-purpose programmable controller in the elevator control device (transfers to the nearest floor using the relay circuit part) It executes control.

[Effect] In the elevator control device according to the present invention, when the general-purpose programmable controller fails, the failure detection relay that detects the failure operates the elevator safety relay to immediately stop the elevator, thereby ensuring safety. You will be able to do this. In addition, a relay circuit is installed in the elevator control device, excluding the general-purpose programmable controller, to move cars stopped between floors to the nearest floor, which prevents passengers from becoming trapped inside the car. will be done. [Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, (+) and (-) are positive and negative power supply lines, 1 is the power supply of general-purpose programmable controller 2, and 3
is an abnormality detection relay that is built in or externally attached to the general-purpose programmable controller 2 and serves as an abnormality detection means for detecting abnormalities in the general-purpose programmable controller 2, and is composed of a coil 3a and its normally open contact 3b. ing. 4 is a run/stop control terminal that controls the start/stop of the general-purpose programmable controller 2;
6 is a safety circuit that houses important contacts for ensuring safety such as overshoot limit switch contacts; 6 is a door closed detection circuit that detects whether the door is closed in the landing area or in the car; 7 and Reference numeral 8 denotes a rising operation command circuit and a landing operation command circuit, which are constituted by a group of relay contacts driven by the general-purpose programmable controller 2, and command the ascending operation and descending operation of the car. Reference numeral 9 denotes a safety relay that executes control to suddenly stop the elevator when an abnormality occurs, and includes a normally open contact 13a of an abnormality occurrence memory relay 13 that stores the occurrence of an abnormality in the safety circuit 5 and the general-purpose programmable controller 2, which will be described later. Connected between the power lines through. Reference numeral 10 denotes a contactor for upward operation, which is connected to the safety relay 9 in nine parallel lines through the upward operation command circuit 72, the door close detection circuit 86, and the normally open contact 9a of the safety relay 9. 11 is a contactor for descending operation, which includes a descending operation command circuit 82, a door close detection circuit 6, and a safety relay 9.
is connected in parallel to the safety relay 9 via the normally open contact 9a. 12 is a contact of a relay that is turned on for a predetermined time when the power is turned on; 13 is an abnormality occurrence memory relay as an abnormality occurrence storage means for storing the occurrence of an abnormality in the general-purpose programmable controller 2; Connected between power lines. 13b is a normally open contact of the abnormality occurrence memory relay, one end of which is connected to the power line (-) through the abnormality occurrence memory relay 13, and the other end connected to the power line (+) through contact 3b. There is. 13c is a normally open contact of the abnormality occurrence memory relay 13, which is connected between the operation/stop control terminal 4 for controlling operation/stop of the general-purpose programmable controller 2 and the internal control circuit. 14a is a normally closed contact of a relay (not shown), which is energized when the elevator travels in the upward direction before the sudden stop, and demagnetized when it is in the downward direction; 14b is the contact 1
This is a contact point that performs the opposite operation to 4a. 15a is a normally open contact of an inter-floor stop detection relay (not shown) that detects that the car has stopped between floors, and is connected in parallel to the contact 13a. Reference numeral 15b is a normally open contact of the inter-floor stop detection relay, which is connected in parallel to the ascending operation command circuit 7 via the contact 14a. 15C is a normally open contact point of an inter-floor stop detection relay (not shown), which is connected in parallel to the descending operation command circuit 8 via a contact point 14b. and,
The contacts 15a to 15c of these interfloor stop detection relays are
It closes when a predetermined period of time has elapsed after detecting a stop between floors, and opens when the door enters the open door zone of the nearest floor. The operation will be explained below. In the circuit configured as described above, the operation will be described first when the general-purpose programmable controller 2 is operating normally and the elevator car is normally moved from hall to hall. In the abnormality detection relay 3 that detects an abnormality in the general-purpose programmable controller 2, since the general-purpose programmable controller 2 is normal, the coil 3a is excited and its contact 3b is closed. Therefore, even if the contact 12 is opened after a predetermined time has elapsed since the power is turned on, the abnormality occurrence memory relay 13 that stores the abnormality of the general-purpose programmable controller 2 will be able to connect the power line (+) to the contact 3b-
Contact 13b - Abnormality memory relay 13 - Power line (-
), the contact point 1
3a remains closed. Further, since the inter-floor stop detection relay does not detect the inter-floor stop of the car, its normally open contacts 15a to 15c are in an open state. Therefore, the safety relay 9 connects the power line (+) safety circuit 5
The contact 9a is closed by being excited along the path of - contact 13a - safety relay 9 - power line (-). When the contact 9a is closed, power is supplied to the ascending/descending operation command circuits 7 and 8 via the path of power line (+) - safety circuit 5 - contact 13a - contact 9a - door closed detection circuit 6. . Here, when the ascending operation command circuit 7 or the descending operation command @road 8 issues an ascending operation command or a descending operation command, the ascending operation contactor 10 or the descending operation contactor 11 is activated according to the generated operation command. It is energized and the elevator car is moved up and down. Next, the operation when an abnormality occurs in the general-purpose programmable controller 2 will be explained. When an abnormality occurs in the general-purpose programmable controller 72, the coil 3a constituting the abnormality occurrence detection relay 3 is deenergized and becomes demagnetized, so that its contact 3b is opened. When the contact 3b is opened, the self-holding circuit of the abnormality memory relay 13 is opened, so the abnormality memory relay 13 is demagnetized and its contacts 13a, 13b, and 13c are opened. Then, safety relay 9. Since the upward operation contactor 10 or the downward operation contactor 11 is demagnetized and the operation/stop control terminal 4 that controls operation/stop of the general-purpose programmable controller 2 is opened, the operation of the elevator is suddenly stopped. At the same time, the operation of the general-purpose programmable controller 2 is also stopped. Furthermore, when the car stops between floors due to the sudden stop operation of the elevator, an inter-floor stop detection relay (not shown) is energized after a predetermined period of time, so its normally open contacts 15a to 1 are energized.
5c is closed and the safety relay 9 is re-closed, and if there is a sudden stop during upward operation, the downward operation contactor 11 is energized via contact 14b, and if there is a sudden stop during downward operation, the contactor 11 for downward operation is energized. The contactor 10 for upward operation is connected via the contact 14a.
is excited, and the elevator performs a descending or ascending operation. When the elevator car moves to the door open zone of the nearest floor, the normally open contact 15a-15 of the inter-floor stop detection relay
c will open and the car will stop within the door open zone. Therefore, in the elevator control device configured in this way, when the general-purpose programmable controller fails, the relay that detects the failure operates the elevator safety relay to immediately stop the operation of the elevator, and the general-purpose programmable controller - The operation of the controller is reliably stopped, and when the elevator stops between floors, the circuit portion of the elevator control device other than the general-purpose programmable controller executes control to move to the nearest floor. In addition, in the above embodiment, the case where the elevator is applied to an AC-1 control system has been explained, but the AC
It goes without saying that similar effects can be obtained even when applied to other control methods such as -2 control method.
stomach. Further, depending on the type of general-purpose programmable controller, the usage of the operation/stop control terminal may differ, but it is easily inferred that the operation/stop control is performed in the same way.

【Effect of the invention】

As described above, according to the present invention, the elevator and the general-purpose programmable controller are reliably stopped by the abnormality detection relay that detects an abnormality in the general-purpose programmable controller, and after a predetermined time, a circuit other than the general-purpose programmable controller stops the elevator and the general-purpose programmable controller. Since the elevator control system is configured to perform rescue operations for people trapped in the car, it has the effect of providing a highly safe elevator control system even though a general-purpose programmable controller is used.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing an elevator control device according to an embodiment of the present invention. 2 is a general-purpose programmable controller, 3 is an abnormality detection relay, 4 is a run/stop control terminal, 5 is a safety circuit,
6 is a door closed detection circuit, 7 is an upward operation command circuit, 8 is a downward operation command circuit, 9 is a safety relay, 10 is a contactor for upward operation, 11 is a contactor for downward operation, 13 is an abnormality occurrence memory relay, In the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] An elevator control device that uses a general-purpose programmable controller as part of a control circuit, comprising: abnormality occurrence detection means for detecting abnormality occurrence in the general-purpose programmable controller; an abnormality occurrence storage means for storing the occurrence of an abnormality, and when the abnormality occurrence storage means stores the occurrence of an abnormality, the safety relay of the elevator is operated to suddenly stop the elevator, and the operation of the general-purpose programmable controller is also stopped, and the operation of the general-purpose programmable controller is stopped; A control device for an elevator, characterized in that after a certain period of time, restart operation is enabled only by a circuit other than the general-purpose programmable controller.