JPS5813470B2 - AC elevator operation control device during power outage - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an operation control device for an AC elevator during a power outage, which performs a rescue operation of the elevator using a separately installed DC power source in the event of a power outage.

FIG. 1 is a block diagram showing an example of the main circuit of this type of elevator. The Sanwa induction motor IM, which is directly connected to the traction machine TM, is normally connected to the control device CP from the regular power supply RST.
Power is supplied through the

A car F is suspended on one side of the trolley machine TM via a rope, and a counterweight W is suspended on the other side.

BR is an electromagnetic brake. By the way, the regular power supply RST
When there is a power outage, the three-phase induction motor IM is connected to the DC power supply EB (
Power is supplied from a battery (battery, etc.) via a cam contactor inverter device INV that converts direct current to alternating current.

The inverter device INV is composed of a cam collector A-F and a cam motor KM, and when the cam motor KM rotates, the cam contactors A-F repeat opening and closing periodically as shown in FIG.

Therefore, in the event of a power outage, alternating currents Iu, Iv, and Iw shown in FIG. 3 flow through the primary windings of the three-phase induction motor IM to generate a rotating magnetic field, causing the motor IM to rotate in either the forward or reverse direction. Operate the elevator, which is the load, up or down.

Currently, the regular power supply RS is disconnected for some reason while the elevator is operating.
When a power failure occurs at T, the elevator suddenly stops, and the no-voltage detection relay NV detects this and turns off, and the three-phase induction motor IM is disconnected from the regular power supply RST by a circuit not shown.

At the same time, an emergency operation relay 10U is installed in a circuit not shown.
(not shown) is turned on, and in FIG.
Since U1 is closed, P-NV1-10U1-PS1-
Position detection relay 91Q is turned on in circuit 91Q-N.

When relay 9IQ is turned on, its contact 91Q1 is closed and cam motor start relay NK is turned on, and contacts NK1 and NK2 of relay NK shown in FIG. 1 are closed, so that cam motor KM is supplied with power from DC power supply EB. Cam motor KM starts.

At the same time, in FIG. 4, since the contact NK3 is closed, the timer 10T is turned on after a certain period of time has passed, and since the contact 10T is closed, the starting contactor/tactor NA is turned on.When the contactor NA is turned on, the first Contacts NA1 and NA2 of the contactor NA shown in the figure are closed, and power is supplied to the cam contactor inverter device INV from the DC power source EB.

At the same time, in FIG. 4, contact NA3 is closed, so starting relay NAX is turned on.

By the way, in the past, the circuit shown in FIG. 5 was used to command the operating direction of the elevator during a power outage.
This is a load detection device that turns on when the load is % or more and turns off when the load is less than 50%.

Now, assuming that the loading capacity of car F is less than 50%,
Since load detection device WD50 is off, load detection relay 65W is also off.

Therefore, the contact 65W2 is closed, and the fourth contact 65W2 is closed.
When relay NAX turns on and its contact NAX closes, P-NAX4-65W2-11-125-
The rising contactor 11 is turned on in the ULS-H circuit, and in FIG. , 11 are closed, so
The elevator is operated upward.

Also, when the loading capacity of car F is 50% or more, load detection device WD50 is on, so P-WD50-N
Load detection relay 65W is turned on by the circuit of AX3-10T2-65W-H, its contact 65W2 is opened, and 65
Since W3 is closed, P-NAX4-65W3-12-
115-DLS-N circuit lowers contactor 1
2 turns on.

As a result, contacts 121 and 122 are closed in FIG. 1, so that the elevator is operated downward.

In FIG. 5, 115 and 12 are auxiliary contacts of the contactors 11 and 120, respectively, ULS is an over-rise limit switch, and DLS is an over-fall limit switch.

As mentioned above, conventionally, when switching the elevator to DC power during a power outage and performing a rescue operation, the elevator is operated in a light load direction, which drives the three-phase induction motor IM shown in Figure 1. The DC power supply EB for this purpose has a relatively small capacity.

Therefore, in the command circuit shown in FIG.
If the D50 malfunctions or malfunctions due to aging etc., an elevator operation command may be issued in the heavy load direction.In such a case, the three-phase induction motor IM
If the direction of the load torque becomes larger than the drive torque output by the elevator, problems such as the elevator not starting or reversing will occur.

The present invention has been made in view of the above, and an object of the present invention is to provide an operation control device for an AC elevator during a power outage, which can operate an AC elevator without any trouble using a small-capacity DC power supply during a power outage. It's about doing.

The first feature of the present invention is that when switching to DC power during a power outage and issuing an operation command to the elevator by selecting a light load direction, if the operating speed of the elevator remains below a predetermined speed even after a predetermined period of time has elapsed. The point is that a command is issued to switch the direction of operation of the elevator.

A second feature of the present invention is that if a predetermined time elapses after issuing a command to switch the operating direction of the elevator and the elevator is in reverse or at a predetermined speed or less, a command to stop the elevator operation is issued. It is in the point that I made it.

The present invention will be described in detail below with reference to the embodiments shown in FIGS. 1, 6, and 7, and FIG. 8.

In FIG. 1, PG is a DC speed generator that detects the rotational speed of the three-phase induction motor IM, and outputs proportional to the rotational speed are output from contacts 113 and I14 of the ascending contactor 11 and contacts 123 and 123 of the descending contactor 12, respectively. 124 to the polarized signal detector A90P.

FIG. 6 is a circuit diagram showing an embodiment of the operation command circuit of the operation control device of the present invention. , WD50 is a load detection device, 10U2 is a normally open contact of the emergency operation relay 10U (not shown), and 10T2 is the same as in Fig. 5.
is the normally open contact of the timer 10T in Fig. 4, 65W is the load detection relay, 65W1 and 65W3 are the normally open contacts, and 65
W2 is a normally closed contact, 11 is a rising contactor, 12 is a falling contactor, IT, 2T are timers, 1T1, 2T
2 is each normally open contact, 10Q is a direction reversal relay, 10Qt, 10Q2 is its transfer contact, 10Q
3, 10Q4 is a normally open contact, 10R is a failure detection relay,
10R1 is its normally open contact, and 90P1 and 90P2 are the polarized signal detection relay 90P of the polarized signal detector A90P in Fig. 1.
Normally closed contact (described later), 115, 116, ULS, D
The LS is similar to that shown in FIG. 5, and these are connected as shown in the figure.

Now, in Fig. 1, the regular power supply RST has a power outage, the no-voltage detection relay NV detects it and turns off, and as shown in Fig. 4, the contact NV1 of the relay NV is closed, and the circuit (not shown) Emergency operation relay 10U (not shown) is turned on, its contact 10U1 is closed, position detection relay 91Q is turned on, and then, as described above, cam motor start relay NK, timer 10T, start contactor NA, and start relay NAX are turned on in sequence. Suppose that it is turned on and its contact NAX4 is closed.

At this time, as explained using FIG. 5, when the loading capacity of the car F is less than 50%, the load detection device WD50 is turned off and the lifting contactor 11 is turned on, and as shown in FIG. Since the contacts 111 and 112 are closed, the AC power shown in FIG. 3 is supplied to the three-phase induction motor IM from the DC power supply EB via the cam contactor inverter device INV.
The electric motor IM is started and the elevator is operated to ascend.

Further, when the loading capacity of the car F is 50% or more, the load detection device WD50 is turned on, the lowering contactor 12 is turned on, and the contacts 121 and 122 are closed in FIG. 1, so the elevator is lowered. be driven.

As mentioned above, when the load is light, the elevator is issued with an operation command in the upward direction and does not operate upward, and when the load is heavy, an operation command is issued in the downward direction and the elevator is operated downward.
Under normal conditions, the time from when the starting relay NAX shown in FIG. 4 is turned on and the elevator starts to reach the rated speed is the time shown by Tt in FIG. 8.

By the way, in the present invention, the operating state of the elevator is detected by the speed generator PG shown in FIG.
When the descending contactor auxiliary contacts 123 and 124 are closed, the polarity is switched and input to the polarized signal detector A90P.

FIG. 7 is a circuit diagram showing an embodiment of the polarized signal detector shown in FIG. 1. In FIG. 7, r is a resistance, rs is a variable resistance, and T
r1 to Tr3 are transistors, ZD is a Zener diode, D1 to D3 are diodes, and 90P is a polarized signal detection relay, which are connected as shown in the figure.

When the elevator is stopped, the output of the speed generator PG is zero, so the comparison voltage Vs turns on the transistor Tr2.
Since the terminal voltage of the Zener diode ZD does not reach the Zener voltage, the transistor Tr3 is turned off and the polarized signal detection relay 90P is turned off.

When the elevator starts, the output of the speed generator PG rises, but the rise characteristics vary depending on the load condition of the elevator, as shown in Figure 8.
When the balanced load increases, the characteristics shown by VHU are obtained.

Therefore, the time it takes for the speed voltage to reach the comparison voltage Vs is different from t1 and t2.

When the output of the speed generator PG exceeds the comparison voltage Vs, as shown in FIG. 7, the transistor Tr2 turns off and the transistor Tr3 turns on, so the polarized signal detection relay 90
P turns on.

In this way, it is detected whether the ascending operating speed (the same applies to the descending operating speed) of the elevator has reached a predetermined speed by turning on or off the polarized signal detection relay 90P.

By the way, when the loading capacity of the multiplication nine F shown in Fig. 1 is heavy at 50% or more, the load detection device WD50 shown in Fig. 6 malfunctions due to aging or other causes and remains turned off. Then, the Sanwa induction motor IM rotates in the upward operation direction because the upward contactor 11 is turned on, and outputs a driving torque in the upward direction.

However, in this case, the load torque of the elevator may be larger than the drive torque of the three-phase induction motor IM, and in that case, the elevator does not start or is reversed.

In such a case, in the present invention, the polarized signal detector A
Since the output voltage of the speed generator PG input to 90P is zero or negative, the polarized signal detection relay 90P does not turn on, so it is used.

That is, in FIG. 6, the monitoring time (time limit) of the polarized signal detection relay 90P of the timer 1T is T't, and from the relationship with the time t2 until the output of the speed generator PG reaches the comparison voltage Vs, T't is set in advance so that T't>t2 is satisfied, and the timer 1T is turned on after a predetermined time T't has elapsed since the activation relay NAX was turned on in FIG. 4.

At this time, if the elevator's ascending (or descending) operation is slow, or if the elevator does not start or descends and the polarized signal detection relay 90P remains off,
The direction reversal relay 10Q is turned on by the circuit P-NAX, -IT1-90P1-10Q-N.

When relay 10Q turns on, its contacts 10Q1, 10Q
Since the opening and closing of 2 are reversed, the rising contactor 11
is on, the descending contactor 12 is on,
Since the ascending contactor 11 is turned on when the descending contactor 12 is on, it is possible to issue a command to switch the operating direction of the elevator.

As a result, the operating direction of the elevator is switched, and the elevator starts normally.

Furthermore, if the elevator does not start even after switching the operating direction of the elevator, the following steps are taken.

Direction reversal relay 10Q turns on and its contact 10Q4
is closed, and when a predetermined time T't has elapsed, the timer 2T is turned on, and when the contact 2T is closed, if the polarized signal detection relay 90P is off, P
-NAX, -2TI-90P2-1OR-N circuit turns on failure detection relay 10R, and this relay 10R
When turned on, an emergency operation relay 10U (not shown) is turned off using a circuit not shown, thereby stopping the operation of the elevator.

According to the embodiment of the present invention described above, when the power supply of the three-phase induction motor IM is switched to the DC power supply EB and the elevator is operated for rescue operation due to a power outage in the regular power supply PST, the elevator continues to operate even after a predetermined period of time has elapsed. If the motor does not start in the same direction as the commanded direction, or if the operating speed does not reach the specified value even after starting9, or in extreme cases it reverses, switch the operating direction and then switch the operating direction again. Also, if a phenomenon similar to the above occurs, the elevator is stopped, which has the following advantages.

(1) Passenger jamming during power outages can be almost completely prevented.

(2) DC power supply EB and cam contactors A-F can be made smaller and cheaper; (3) If ascending or descending operation is not performed normally, it will be immediately noticed; Since the direction of operation is changed and the elevator is stopped if the operation direction still fails, unnecessary power consumption is prevented and the safety of the elevator is improved.

As explained above, according to the present invention, there is a remarkable effect that an AC elevator can be operated without any trouble using a small-capacity DC power supply during a power outage.

[Brief explanation of drawings]

Figure 1 is a block diagram showing an example of the main circuit of an elevator that switches the power supply to DC power during a power outage, Figure 2 is an operation time chart of the cam contactor of the cam contactor inverter device in Figure 1, and Figure 3 is Figure 1 is a waveform diagram of each phase current flowing through the primary winding of the three-phase induction motor when switching to DC power supply, Figures 4 and 5 are control circuit diagrams of a conventional operation control device, and Figure 6 is 8 is a circuit diagram showing an embodiment of the operation command circuit corresponding to FIG. 5 of the operation control device of the present invention; FIG. 7 is a circuit diagram showing an embodiment of the polarized signal detector of FIG.
The figure shows the operating characteristics of the polarized signal detector. RST...Common power supply, EB...DC power supply, INV...Positive cam contactor inverter device, NV...No-voltage detection relay, IM...Three-phase induction motor, PG...DC speed generator, A90P...Polarized signal Detector, F... Car, KM...
...Cam motor, NK...Cam motor start relay, 10T
...Timer, NA...Start contactor, NAK...Start relay, WD50...Load detection device, 65W...Load detection relay, 11...Up contactor, 12...Down contactor, IT, 2T...Timer , 10Q... Direction reversal relay, 10R... Failure detection relay, 90P...
Polarized signal detection relay, Trl to Tr3...transistor, r3...variable resistor.

Claims (1)

[Claims] 1. A common power source, an elevator driving induction motor supplied with power from the common power source, a DC power source, an inverter device,
means for commanding the operating direction of the elevator in the light load direction, and in the case of a power outage of the commercial power supply, power is supplied from the DC power supply and the inverter device to the induction motor in the direction of operation commanded by the means, means for detecting the operating speed of the elevator after power is supplied to the induction motor from the inverter device; means for detecting that the operating speed does not reach the predetermined speed within a predetermined time; and in response to the means, the operating direction is reversed. 1. An operation control device for an AC elevator during a power outage, characterized by comprising means for switching directions. 2. A common power source, an elevator driving induction motor supplied with power from the common power source, a DC power source, and an inverter device,
means for commanding the operating direction of the elevator in the light load direction, and in the case of a power outage of the commercial power supply, power is supplied from the DC power supply and the inverter device to the induction motor in the direction of operation commanded by the means, means for detecting the elevator operating speed after power is supplied to the induction motor from an inverter device; means for detecting that the operating speed does not reach a predetermined speed within a predetermined time; and in response to the means, the operating direction is reversed. means for switching the direction, means for detecting that the operating speed does not reach a predetermined speed within a predetermined time in response to a command in the opposite direction, and means for generating a stop command for the elevator in response to the means. An operation control device for an AC elevator during a power outage, characterized by comprising: