JPH03293277A - Control device for elevator - Google Patents

Abstract

PURPOSE:To prevent malfunction at overload at detecting the load once by obstructing start of an elevator until the load is removed through self-holding of a detecting relay, independent of ON-OFF of contacts in an abnormal using condition. CONSTITUTION:When overload is detected, an overload detecting device WD110 makes running command relays 11A, 12A OFF with a b-contact. When a door is not closed. on the a-contact side of the overload detecting device WD110 a buzzer BZ is rung to raise an alarm, the buzzer is not stopped to ring until passengers get out of a cage to dissolve overriding, and then returned to initial condition. When the door is closed neglecting the alarm, a relay 65WA is self- held with a contact 65WA3, and the buzzer BZ is continued to ring with a contact 65WA2. At this time, even if a person jumps or goes wild in the cage, the running command circuit is put OFF with a contact 65WA1 not to enable to run due to self holding of the relay 65WA. When the door is opened and the person gets out of the cage, a relay 40, the overload detecting device WD110, and the relay 65WA are put OFF, and the normal condition is returned.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a control device related to overload detection and load detection in an elevator.

[Conventional technology]

According to Article 129-9, Paragraph 12 (a) of the Building Standards Act Enforcement Ordinance, elevators are required to issue an alarm, prevent the entrance/exit door from closing, and prevent the elevator from starting if the load significantly exceeds the load. .

Therefore, a weighing device or the like is installed in the elevator, under the floor, at the end of the rope, etc., to detect the load inside the car. for example,
The contacts of the weighing device turn off the door closing circuit and the start command circuit, and when started, a short circuit occurs at the running relay contact.

Note that related devices of this type include, for example,
JP-A No. 61-248877 is mentioned.

[Problem to be solved by the invention]

The above-mentioned conventional technology does not take into account the malfunction of the load detection device under abnormal usage conditions, and there is a problem in that the elevator may start even if it is overloaded, for example.

An object of the present invention is to allow a load detection device to operate normally even under abnormal usage conditions, thereby improving the stability of the elevator.

Another object of the present invention is to prevent malfunction of the load detection device.
The aim is to improve and maintain speed control and operation control performance, and to prevent chattering in devices linked to the load detection device.

[Means to solve the problem]

In order to achieve the above object, the present invention makes the detection relay self-hold when the load is detected, regardless of whether the contact is ON or OFF in the abnormal usage state, and the elevator is started until the load is removed. It is designed to prevent

[Effect]

The load detection relay will self-hold when it detects the load, so the elevator will start even if there is an overload because it has no relation to the ○N-〇FF of the load detection device contacts in abnormal usage conditions. This will eliminate this malfunction.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG. 1st
The figure shows the travel command circuit for an elevator without a door machine (manual door).

11A is the 1 ascending relay, 11A 1 to 8 are its contacts, 12A is the descending relay, 12 people 1 to 3 are its contacts, IOA is the running relay, 10Az is its contacts, 65WA is the overload relay. It is a relay for load detection, 65WAz
-8 are the contact points.

BZ is a buzzer that sounds and issues an alarm when the overload detection device WDIIO is activated. ULS.

DLS are limit switches for raising and lowering limits, respectively. 61A and 62A are relay contacts for ascending and descending selections, 9]-1 and 2 are stop command relay contacts, 921 are deceleration command relay contacts, and 401 and 2 are door closing detection relay contacts.

In this circuit, if the overload detection device WDIIO is not operating, 61A will turn ON if there is a rise command, so IIA will turn ON.
, if the door is closed, 4o is ON, so IOA
is turned on, so the elevator starts in the upward direction. (Motor control circuit omitted) When the overload detection device WDIIO operates, the contact side of WDllo opens and IIA cannot be turned on.

At the same time, the a contact side of WDl, 10 closes and the buzzer sounds to issue an alarm.

Next, we will discuss what happens when there is an abnormal operation, ie, the car jumps or thrashes around inside the car, during overload.

Even if the manual door elevator is overloaded, the door will be closed by hand. At this time, when I jumped inside the basket, WDll
o, the contact returns to its original state, the b contact side closes, and the a contact side opens,
In addition, it will return to its original state, that is, the ON-OFF state of the contacts will be repeated.

The WDIIO contacts return to normal. That is, since the state is the same as under overload, IIA is ONL, and as mentioned above, there was a problem in that the elevator started even though it was overloaded.

Therefore, we newly added 65WA1 to 3 as shown in Figure 1, and once an overload is detected, the overload detection is maintained until the overload is removed, regardless of the status of the contacts of the overload detection device. We decided to prevent the elevator from starting up incorrectly.

Now, when an overload is detected and WDIIO is activated, the travel command circuits 11A and 12A are turned off by the b contact.

If the door is not closed, a buzzer BZ will sound on the a contact side of WDIIO, an alarm will be issued, and the overload state will be restored (if the door is overloaded, people will get off until the buzzer stops sounding).

However, if you ignore the alarm and close the door, the 65WA
is self-maintained by 65WAa. Buzzer BZ is also 65W
Az continues to ring even when the door is closed (previously it stopped ringing). At this time, I jumped up and down inside the cage and
If there is an abnormal operation to restore the DIIO to its original state, as mentioned above, conventionally the elevator would start, but the 65W
Since A is self-holding, the travel command circuit is turned off by 65WA1, so it is not possible to travel.

In addition, in order to release the overload, if the door is opened and a person gets out, 40 will turn 0FFL and WD 110 will also turn OFF, so 6
The 5WA self-holding circuit also returns to normal because the overload condition is also released.

In this way, even if the car jumps inside the car and the overload detection device malfunctions in an overload condition, the elevator will not start up erroneously, and the elevator will return to its original normal condition once a person gets off the car and the overload condition is released. Can be done.

〔Effect of the invention〕

The present invention prevents the car from bouncing around in the car under overload conditions.
Even if the overload detection device turns OFF due to overload, etc., the overload state is maintained without being released, and malfunction of the elevator due to overload can be prevented.

Similarly, false detection can be prevented.

Furthermore, it is possible to prevent malfunctions, chattering, etc. of devices linked to the load detection device, such as door machines.

[Brief explanation of drawings]

FIG. 1 is a diagram of an overload detection circuit and a running command circuit according to an embodiment of the present invention.

Claims (1)

[Scope of Claims] 1. An elevator control device comprising an overload detection device and a control device having a startup prevention function using the overload detection device, characterized in that a malfunction prevention device for the overload detection device is provided. 2. An elevator control device comprising a load detection device and a control device that performs speed control and operation control using the load detection device, characterized in that the load detection device is provided with a malfunction prevention device. 3. An elevator control device comprising a load detection device and a device such as a door machine linked thereto, further comprising a device for preventing chattering of the door machine due to malfunction of the detection load device.