JPH0144631B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an improvement in an elevator operation device during a power outage.

[Prior art]

In recent years, inverters have come to be used to control elevator drive motors for the purpose of reducing power consumption, etc., but by supplying power from batteries to this inverter even during power outages, it is possible to operate during power outages. It is an isolated DC that does not require a particularly complex inverter control device, and is compatible with each control power source that must be supplied during power outage.
- A power outage operation device that does not include a DC converter or constant voltage circuit has been proposed.

A specific example is shown in FIG. In the figure, 1 is a three-phase AC commercial power supply, 2 is a normally open contact of a contactor that is excited when the elevator is running, 3 is a converter that converts three-phase AC voltage to DC voltage, and 4 is a smoother for the output voltage of converter 3. 5 is an inverter that converts DC voltage into variable voltage, variable frequency three-phase AC voltage; 6 is an induction motor for driving the elevator; 7, 8
9 is a control circuit that controls the transistor of the inverter 5 and the transistor 8 for consuming regenerative power; 10 is a three-phase transformer that supplies power to the control circuit 9; 11 is a battery for operation during power outage;
12 is a normally open contact of a contactor that is energized during a power outage, 13 is a diode for supplying power from the battery to the inverter during a power outage, and 17 is a battery 11.
Inverters 19 and 20 that convert the DC voltage from the three-phase transformer 10 into three-phase AC voltage are inserted and connected to the front stage of the three-phase transformer 10, and are a normally open contact and a normally closed contact of a relay that are energized during a power outage, respectively.

In the above configuration, when the commercial power supply 1 is normal, the contacts 12 and 19 are open and the contact 20 is closed, so the inverter 5 generates an output with a frequency and voltage according to the output of the control device 9. When electric power is regenerated from the motor 6, the control device 9 detects this and turns on the transistor 8, causing the resistor 7 to consume the regenerated electric power.

On the other hand, when the commercial power supply 1 experiences a power outage, the contact 12 is closed by power from an emergency standby power supply, etc., and the output voltage of the battery 11 is applied to the DC side of the inverter 5 via the diode 13. The output voltage of the battery 11 is also applied to the DC side, and as a result, the inverter 17 generates a three-phase AC voltage. On the other hand, contact 20 is open and contact 19
is closed, a three-phase AC voltage which is the output of the inverter 17 is applied to the primary side of the transformer 10, and power is supplied to the control device 9. Therefore,
The control device 9 controls the inverter 5 and the regenerative power consumption transistor 8 in the same way as when the commercial power source 1 is normal, so that the torque and rotation speed of the motor 6 are controlled.

However, if the contact 19 closes immediately after the contact 20 opens due to a power outage, the control power is lost for only a very short period of time, so the initial reset time of the control device 9 using a microcomputer, gate logic element, etc. is not secured. Mode switching from normal operation to power outage operation may not be possible. Furthermore, if the contact 20 closes immediately after the contact 19 opens when the power is restored and the power outage operation ends, there is a possibility that mode switching from the power outage operation to the normal operation may not be possible.

[Summary of the invention]

The present invention aims to eliminate the above-mentioned drawbacks and provides an elevator operating device during a power outage that can reliably switch the operating mode during a power outage and when the power is restored.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described based on the structure of FIGS. 2 and 3, in which the same parts as in FIG. 1 are denoted by the same reference numerals. In FIG. 2, 26d,
26e and 26f are contacts of a normal power supply contactor 26, which will be described later. 28b is a contact of an emergency power supply contactor 28, which will be described later. 31a is a contact of a contactor 31, which will also be described later. These contacts are used for mode switching as shown in FIG. Opening/closing is controlled by a circuit.

In other words, in FIG. 3, the normal power supply contact 26f is opened during a power outage of the three-phase AC commercial power supply 1, and the power is supplied at the time of a power outage after at least the initial reset time of the elevator control device 9 has elapsed (after the contact 26d is closed). Close contact 28b to eliminate battery 11 during power outage
and perform rescue operation using the inverter 17,
At the end of the rescue operation, the power supply contact 28 during power outage
2 is a mode switching circuit configured to open the normal power supply contact 26f and close the normal power supply contact 26f after at least the initial reset time of the elevator control device 9 has elapsed. contactor, 21 is a power failure detection relay, 2
1a has its normally closed contact, 22 has a contact 22a,
Relay that picks up immediately when the power goes out, 2
4 has contacts 24a and 24b, and after a power outage, for example, 5
Relay that picks up after seconds, 26 is contact 26
28 is an emergency power supply contactor having contacts 28a to 28c and picking up, for example, 6 seconds after a power outage;
The pick-up time difference between the contactors 26 and 28 is set to be longer than the reset time of the control device 9. Further, 23, 25, 27, and 29 are drivers for these relays and contactors.

Furthermore, HD5S has a signal that goes high after 5 seconds after a power outage, and HD6S has a signal that goes high after 6 seconds after a power outage.
ESTP1L is a signal that goes high immediately after a power outage and goes low when the rescue operation ends, and ESTP2L is a signal that goes high immediately after a power outage and goes low one second after the signal ESTP1L goes low.
The difference between ESTP1L and ESTP2L is set to be longer than the reset time of the control device 9. Note that 30 is a contactor that is picked up only under running conditions, and 31 is a contactor that is picked up only when the motor is driven in a rescue operation, and is interlocked with the contactor 2 for normal running.

According to the above configuration, mode switching can be performed as shown in FIGS. 4 to 6. That is,
Figure 4 is a time chart in the case of a short power outage of 5 seconds or less. In this case, relay 22 picks up, but relay 24, contactor 26,
No. 8 is picked up, so no rescue operation is performed. FIG. 5 is a time chart in the case of a long-term power outage, in which case the system will switch to rescue operation. Note that the broken line portion of the signal waveform of the contactor 31 indicates a case where the car had already stopped within the door zone at the time of the power outage. FIG. 6 is a time chart when the power is restored during a rescue operation, and the rescue operation is performed. When the rescue operation is actually performed according to FIGS. Contactor 2 after time T has elapsed
8 to close contact 28b, and when the rescue operation is finished, contact 28 of contactor 28 is picked up.
8b is opened and after a predetermined time T has passed, the contact 26f of the contactor 26 is closed so that T>reset time, and there is a time difference between the opening and closing of the contacts 26f and 28b, and this time difference is longer than the reset time of the control device 9. This allows the mode to be switched reliably. Also, when there is no need to drive the motor, the main inverter 5 and battery 11 are not connected, so if the motor is stopped in the door zone from the beginning, if the capacitor 4, transistor 8, or internal elements of the inverter 5 fail, etc. The door can be opened and closed at any time, and no electricity is wasted.

〔Effect of the invention〕

As described above, according to the present invention, in the event of a power outage, the normal power supply contact is opened, and after at least the initial reset time of the elevator control device has elapsed, the power outage supply contact is closed to perform a rescue operation in the event of a power outage.
At the end of the rescue operation, the power supply contact during power outage is opened, and after at least the initial reset time of the elevator control device has elapsed, the contact for normal power supply is closed. Can be switched reliably.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing a conventional example, FIG. 2 is a diagram equivalent to FIG. 1 showing an embodiment of the present invention, and FIG. 3 is a mode switching circuit diagram for controlling the mode switching contacts in FIG. Figures 4, 5, and 6 show time charts for the operations of each part in Figure 3. Figure 4 shows when the power outage lasts less than 5 seconds, Figure 5 shows when the power goes out for a long time, and Figure 6 shows when the power is restored. Each case is shown below. 3: converter, 5: first inverter, 6:
Electric motor, 9: Control device, 10: Transformer, 11: Battery, 17: Inverter, 21: Power failure detection relay, 26: Normal power supply contactor, 28: Normal power supply contactor, 28: Emergency power supply contactor, 31: A contactor that is picked up only when the motor is driven in a rescue operation. Note that the same reference numerals in the drawings indicate the same or equivalent parts.

Claims (1)

[Claims] 1. A converter that rectifies a commercial AC power source and converts it into DC, and a first inverter that converts the output of the converter into an AC voltage with variable voltage and variable frequency to control an induction motor for driving an elevator. a control device that controls the first inverter, a transformer that supplies power to the control device, a battery that supplies the inverter power during a power outage, and an inverter that converts the output voltage of the battery to alternating current. a second inverter that supplies its output to the primary side of the transformer to operate the control device during a power outage; and a normal power supply that connects the primary side of the transformer to the commercial AC power source. and a power supply contact during a power outage that connects the primary side of the transformer and the second inverter, and in the event of a power outage, the power supply contact during normal operation is opened, and at least an initial reset time of the elevator control device has elapsed. Afterwards, the power supply contact during a power outage is closed to perform a rescue operation in the event of a power outage, and when the rescue operation is completed, the power supply contact during a power outage is opened, and after at least the initial reset time of the elevator control device has elapsed, the normal power supply contact is closed. An elevator operating device during a power outage, characterized by comprising a mode switching circuit that closes. 2 The above mode switching circuit operates when the motor is driven.
2. The elevator power outage operating device according to claim 1, wherein power is supplied from the battery to the first inverter only when performing a rescue operation.