JPS5851870B2 - elevator town - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an elevator operation control device for controlling the operation of an elevator driving electric motor by switching to an emergency storage battery during a power outage of the regular power source.

Recently, with the trend of building rush, the demand for elevators has inevitably increased and the requirements for their performance have become stricter.In the event of a power outage to the elevator, passengers or cargo are trapped inside the elevator cage. Accidents occur, but conventionally, as a countermeasure to this problem, the regular power source is switched to a privately generated power source to continue elevator operation.

However, since this private power source is usually quite expensive, such equipment is often not available, and manual rescue work often takes a long time.

In view of these points, an inexpensive and simple-configuration elevator operation control device is developed in which a DC power source such as a storage battery is always charged from a regular power source, and in an emergency, the system switches to the storage battery to continue elevator operation and control. is proposed.

However, in such an elevator operation control device, the emergency storage battery may not be sufficiently charged and sufficient output capacity may not be established, so if the switch is switched and operation continues during a power outage, the elevator An equilibrium state between the induced voltage of the drive motor and the output voltage of the storage battery cannot be maintained, and the motor continues to accelerate and eventually runs out of control, resulting in an elevator accident.

This is because the field of the electric motor is energized and the electric motor driving the elevator is operated in such a way as to promote the non-equilibrium condition.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an elevator operation control device that can prevent a runaway phenomenon caused by insufficient charging or insufficient capacity establishment of an emergency storage battery of an elevator driving electric motor.

In order to achieve this objective, the elevator operation control device of the present invention detects an insufficient charge or insufficient capacity establishment of the emergency storage battery by detecting the output voltage at a predetermined time after the start of discharge of the emergency storage battery, and outputs an eccentric force signal. The structure includes a voltage detection circuit and a device for cutting off the energizing current path of the elevator driving motor through the storage battery in response to the output signal.

The present invention will now be described in detail with reference to actual cases shown in the accompanying drawings.

FIG. 1 shows the main circuit configuration of an operation control device for operating a plurality of elevators according to an actual case of the present invention, FIG. 2 shows the operation control circuit of the operation control device, and FIG. , respectively show the elevation control circuit of the device.

In these figures, 3M is a three-phase induction motor, 4G is a motor generator driven by motor 3, 5M is an elevator driving DC motor that alternately receives the output of this generator and the output of storage battery 2, and 6 is a DC motor for driving an elevator. A voltage detector detects the voltage of the storage battery 2, and 7 indicates another elevator circuit.

In addition, MF is the field winding of the electric motor 5, BU and BD are contactors operating in the upward and downward directions during power outage operation, respectively, and B
A is a contactor for switching the motor main circuit, NV is a non-voltage relay,
COV is a relay to stop operation during power outage, XCO■ is a relay CO
■Timer for, NvT is power outage operation command relay,
XNVT Gj, timer for relay NvT, BR
is a power outage operation discrimination relay, LSR is a landing detection relay, P
B is a reset button, LUD is a relay to stop operation during power outage,
XLUD is a timer for the relay LUD, WR is a load detection relay, UDX is a driving direction relay, BS is a power outage operation confirmation relay, and XBS is a timer for the relay BS.

To put it simply, the operation control device in this actual case switches and connects one emergency storage battery to multiple electric motors that drive multiple elevators when the regular power supply is stopped, and sequentially operates the elevators to the highest level. In an elevator operation control device that controls floor landing, the degree to which the output potential of the storage battery is lowered after the start of discharge compared to before the start of discharge is dependent on the degree of charge of the storage battery is utilized. The state of charge is determined by detecting the degree of decrease in the charge, and if the state of charge is insufficient, the electric motor is disconnected from the storage battery and the nearest floor landing operation control is stopped.

In the elevator drive main circuit shown in Figure 1, when the regular three-phase AC power supplies R, S, and T are supplying power, the output of the motor generator 4G directly connected to the three-phase induction motor 3IM is connected to the main circuit switching contactor. Elevator drive DC motor 5 via BA
Since it is supplied to M, the elevator operates normally.

In addition, in this case, the emergency storage battery 2 is a three-phase power supply R, S, T.
The battery is charged via the charging device 1.

Furthermore, in the operation operation circuit of FIG. 2, the storage battery 12
is being charged from a three-phase power supply via the charging device 11,
The non-voltage relay NV is energized.

Connector BA is an instantaneous excitation type electromagnetic contactor and has two excitation coils. When one coil is energized, the corresponding main contact is closed, and even if this coil is de-energized, it remains in this closed state. is mechanically held, and the other main contact is released.

Conversely, when the other coil is energized, the corresponding other main contact is held closed and one main contact is released.

Therefore, when power is supplied from a three-phase power supply in the circuit shown in FIG.
A closed circuit is formed through contact A.

Now, if the elevator is running under such a regular three-phase power supply and the power supply fails, the motor generator 4 will act as a load on the DC motor 5, and the motor 5 will generate electrical energy through its dynamic braking operation. Stop the elevator after a period of time.

The maximum braking time in this case is measured, and the timer XNVT for power outage operation command in the circuit shown in FIG. 2 is set to, for example, 5 seconds.

If the power failure operation discrimination relay BR of either one of the two elevators is energized after this fixed time period, the discrimination relay BRo of the other elevator 7 is not energized.

In this case, by energizing the discrimination relay BR,
Electric power from the storage battery 12 is supplied between the operation circuit bus lines PC and NC.

Next, the main contact coil of the contactor BA on the power outage operation side is energized to switch the motor 5 from the motor generator 4 to the storage battery 2 side.

Generally, the dead weight of an elevator's counterweight is the sum of the dead weight of the car and kW (k is the unbalance rate), where W (kg) is the rated load of the car.

Therefore, if the value of k is 0.45, O~4
5.In case of multiple loads, raise the elevator and
It is clear that in the case of a 0φ load, it is more advantageous to lower the load from the viewpoint of reducing the capacity of the storage battery 2.

In this example as well, as shown in FIG. 3, a load detector WLS is provided to control the ascending or descending operation using the 45% rated load.

In the elevator control circuit shown in FIG. 3, load detection is performed after a certain period of time, for example, 5 seconds, after a power outage of the elevator's regular power supply to prevent load detection from malfunctioning.

It is self-held after the load detection relay WR operates until the normal power supply is restored.

BS is a confirmation relay provided to confirm that the field magnetic flux of the motor 5 has been established close to the rated value during power outage operation, and XBS is a timer for this purpose.

If the load is less than 45φ, the upward operation contactor BU is finally turned on, power is supplied from the storage battery 2 to the electric motor 5 in FIG. 1, and the elevator ascends.

Note that the voltage of the storage battery 2 is such that even if the brake is applied after direct driving at 1/(for example, n=8 to 10) of the rated voltage of the DC motor in the case of a regular power supply, the motor will not coast much.

Next, the elevator performs a landing operation at the nearest floor by detecting the load, and when it reaches the door zone, a landing detection device (not shown) is activated.
is activated, and the landing detection relay LSR is deenergized.

For this reason, the up-direction operating contactor BU or the down-direction operating contactor BD is deenergized, and the connection between the storage battery 2 and the electric motor 5 in FIG. 1 is released.

At the same time, a brake (not shown) is activated to stop the elevator.

Then, the door automatically opens in the door zone, allowing the passengers inside the cage to exit the hall.

After a certain period of time (door opening/closing time, etc.) at the landing level, the power outage stop relay LUD is energized and self-holds.

Due to the energization of this relay LUD, the power failure operation discrimination relay BR is deenergized, and the discrimination relay BRo of the other unit 7 is released.
is energized and performs the same sequence operation as explained so far.

Of course, even if the regular power supply fails, if you land on the floor where the elevator is, the landing detection relay LsRG'
Since J is not energized, the up or down direction running contactors BU, BD are not energized and the elevator does not move or need to move.

The relay CCX shown in FIG. 2 is used to immediately switch to operation of another machine during a power outage when the elevator is inoperable, as is clear from the circuit conditions shown in FIG.

In this case, the setting time of the timer XLUD for stopping operation in the event of a power failure is set close to zero seconds using the a contact point of the relay CCX to promptly perform the switching operation.

Further, the reset button PB is used as follows.

For example, if there are two elevators, if one of the elevators is inoperable, the relay LUD will be activated immediately to stop operation in the event of a power outage.
The discrimination relay BR is released by operating the
Switch the other elevator to power outage operation.

After this other elevator completes its landing operation at the nearest floor,
When a building manager or the like presses the reset button PB, if the elevator has returned to an operable state, the operation for landing at the nearest floor can be automatically performed immediately.

Having explained the general operation sequence above, the elevator runaway prevention circuit and its operation will now be explained with reference to the discharge characteristic curve diagram of the storage battery 2 shown in FIG.

FIG. 4 is a discharge characteristic curve of the storage battery 2 in the above-mentioned operation control device which uses the storage battery 2 to operate two elevators during a power outage, and 2 is the nominal rated voltage.

In general, even when a storage battery is not connected to a load, its potential maintains a certain value regardless of whether its state of charge is sufficient or insufficient, and this value is shown in Figure 4 (■).

This is an illustration. When the elevator driving electric motor 5 as a load is connected to this storage battery, the storage battery voltage decreases.

That is, as shown in FIG. 4, the elevator acceleration time T
1. During T3, the storage battery voltage dropped almost to the level of ■3.

Then, the Karo speed is applied until the induced voltage of the motor is balanced with the storage battery voltage, and thereafter the voltage v1 is maintained at a generally constant voltage.

Conventionally, elevator drive systems using storage batteries have been operated under the precondition that the storage batteries are sufficiently charged, so no particular attention has been paid to preventing runaway phenomena when the storage batteries are insufficiently charged.

However, when the storage battery is not sufficiently charged and has insufficient capacity, if an elevator with almost no load is operated descending or an elevator with a near rated load is operated upward, the motor accelerates and its voltage exceeds the voltage of the storage battery. Therefore, the two voltages become unbalanced.

When the storage battery is sufficiently charged and has sufficient capacity, the induced voltage of the motor and the voltage of the storage battery are approximately balanced, and the generated braking current IB of the motor flows into the storage battery.

Here, IB=ηBTL , ηB is the reverse efficiency of the hoist gear TL is motor load torque are shown respectively.

In other words, such a state is a kind of equal charging state for the storage battery.

However, as mentioned above, if an unbalanced state occurs due to insufficient charging of the storage battery, the electric motor will continue to accelerate and eventually run out of control.

In order to prevent this runaway phenomenon, according to one embodiment of the present invention, voltage dividing resistors R1 and R2 are connected in series between the terminals of the storage battery 2, and a voltage is applied across the resistor R2. A detector 6VS is connected to detect the voltage of the storage battery 2.

As described above, when the elevators are operated one by one during a power outage, the voltage detector 6 detects that the storage battery voltage remains at a predetermined value, for example, even after a predetermined period of time has elapsed after the start of operation, that is, after the start of discharging of the storage battery 2. An output signal is generated when the voltage does not return to the v2 level shown in FIG. 4. This output signal operates the power failure stop relay COv in the circuit shown in FIG. 2, and this relay COv is self-held.

Therefore, as can be seen from the circuit in Figure 2, the relay CO■
When it is self-held, the discrimination relay BR operates, and the main circuit switching contactor BA cuts off the energizing current path of the motor 5 of the storage battery 2, and the storage battery operation during a power outage is stopped, ultimately preventing the elevator from running out of control. is prevented.

Note that the discharge time T1 or T3 in FIG. 4 differs depending on the load condition of the elevator.

For example, in the case of descending operation with rated load and in the case of ascending operation with no load, these discharge times are very short, or in the case of ascending or descending operation with around 45% load. It's long.

Therefore, even if such differences in discharge time are taken into account, the first
In order to ensure that the circuit shown in FIG. 2 operates satisfactorily, the circuit shown in FIG. 2 is provided with a timer xcov for adjusting the operation time of the operation stop relay CO2 during a power outage, as shown in the figure.

As is clear from the above description, according to the present invention, it is possible to obtain an excellent effect of preventing the runaway phenomenon of the elevator driving motor due to insufficient charging of the storage battery or insufficient capacity establishment.

[Brief explanation of drawings]

FIG. 1 is a wiring diagram showing a main circuit for driving a motor of an elevator operation control device according to a practical example of the present invention, and FIG. 2 is a wiring diagram showing an operation operation circuit of the operation control device of FIG. 3
1 is a wiring diagram showing an elevation control circuit of the operation control device of FIG. 1, and FIG. 4 is a discharge characteristic curve diagram of a storage battery used in the operation control device of FIG. 1. 1...Charging device for main circuit, 2...Storage battery for main circuit, 3...3-phase induction motor, 4...
...Motor generator, 5...Direct current motor for driving elevator, 6...Voltage detector, 7...
Other elevator circuits, 11... Charging device for operating circuit, 12... Rechargeable battery for operating circuit, MF...
...DC motor field winding, BU...Contactor for upward direction operation during power outage, BD...Contactor for downward direction operation during power outage, BA...Main circuit Switching contactor.

Claims (1)

[Claims] 1 It has a regular power supply for energizing the elevator drive motor and a rechargeable emergency power supply, and when the regular power supply fails, it switches to the emergency power supply to energize the elevator drive motor and prevents the elevator from starting. In an elevator operation control device that controls floor operation, when the output voltage of the emergency power source does not return to a predetermined value after a predetermined time has elapsed after the start of discharging of the emergency power source, the emergency power source is insufficiently charged or capacity is established. An elevator characterized in that it is provided with a voltage detection circuit that detects a shortage and generates an output signal, and a device that cuts off an energizing current path of the emergency power source to the elevator drive motor in response to the output signal. Operation control device.