CN110451394B - Method for reducing working condition switching time of bypass frequency conversion escalator - Google Patents

Method for reducing working condition switching time of bypass frequency conversion escalator Download PDF

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Publication number
CN110451394B
CN110451394B CN201910734664.3A CN201910734664A CN110451394B CN 110451394 B CN110451394 B CN 110451394B CN 201910734664 A CN201910734664 A CN 201910734664A CN 110451394 B CN110451394 B CN 110451394B
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frequency
working
contactor
frequency conversion
power
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CN110451394A (en
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陈羽波
任诗晓
黄维纲
王东宝
许晨
顾信鹏
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Canny Elevator Co Ltd
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Canny Elevator Co Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B66HOISTING; LIFTING; HAULING
    • B66BELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B21/00Kinds or types of escalators or moving walkways
    • B66B21/02Escalators
    • B66B21/025Escalators of variable speed type
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B66HOISTING; LIFTING; HAULING
    • B66BELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B25/00Control of escalators or moving walkways
    • B66B25/003Methods or algorithms therefor
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02PCONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P27/00Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
    • H02P27/04Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage

Abstract

The invention discloses a method I for reducing working condition switching time of a bypass variable frequency escalator, which comprises the following steps of: when the escalator senses that no person exists, the escalator is continuously in a frequency conversion working condition, and the main board respectively controls the frequency conversion enabling of the frequency converter and the frequency conversion working contactor to be continuously kept in a connection state. When the escalator senses a person, the phase locking of the frequency converter is completed, and after the switching condition is met, the main board cuts off the frequency conversion enabling of the frequency converter and keeps the frequency conversion working contactor in a switch-on state. After the frequency conversion of the frequency converter enables the stop work, the frequency converter feeds back the stop work signal to the mainboard, and then the mainboard controls the power frequency working contactor to be switched on. The invention cancels the interlocking between the variable frequency working contactor and the power frequency working contactor, allows the variable frequency working contactor and the power frequency working contactor to be simultaneously sucked, and safely and effectively reduces the working condition switching time of the bypass escalator.

Description

Method for reducing working condition switching time of bypass frequency conversion escalator
Technical Field
The invention belongs to the technical field of elevator control, and particularly relates to a method for reducing working condition switching time of a bypass variable frequency escalator.
Background
The escalator controlled by the variable frequency has a pedestrian induction switch, can realize an intelligent operation mode, namely, the escalator runs at a high speed when pedestrians exist, and runs at a low speed until no pedestrians wait for a ladder state after no pedestrians exist. If the escalator adopts a pure frequency conversion control mode, the energy consumption of the frequency converter during working is higher, and after the escalator is used for a long time, the service life of the frequency converter can be exhausted under the frequency conversion working condition. If the escalator adopts a pure star-delta control mode, although the energy consumption is low, the acceleration is high in the starting process, and the escalator is not suitable for an intelligent operation mode. At present, the low-energy-consumption intelligent operation of the escalator can be realized by adopting a mode of combining a frequency converter with star-delta control (namely a bypass frequency conversion mode).
The bypass variable frequency escalator adopts a variable frequency working mode when starting, stopping and running at low speed, and adopts triangular running powered by power frequency when running at high speed. Therefore, under the bypass frequency conversion mode, the process of switching between the frequency conversion working condition and the power frequency working condition exists during starting, the motor is powered off in the process, and the motor is powered on by the power frequency after the switching is completed. In the process of the power failure of the motor, the motor runs continuously by virtue of counter electromotive force, but due to the existence of factors such as friction force, the phase of a power supply and the frequency of the motor change, and the change can generate impact on the escalator at the moment that the escalator is switched to power frequency operation, so that pedestrians feel uncomfortable, therefore, the switching time of working conditions is reduced as much as possible, and the power failure time of the motor is reduced. However, in the switching process, in order to prevent the output of the frequency converter and the mains supply from being supplied to the motor at the same time, the frequency conversion working contactor and the power frequency working contactor are selected to be electrically interlocked or mechanically interlocked, the mode can effectively prevent the power skipping generated when the frequency converter and the mains supply work at the same time, but the method enables the power-off time of the motor to be longer and approximately equal to the disconnection time of the frequency conversion working contactor and the pull-in time of the power frequency working contactor, and if the contactor is in a large-current grade, the power-off time of the motor can be longer.
In addition, because the bypass frequency conversion escalator needs to keep the output power phase and the output power frequency of the frequency converter and the power phase and the power frequency of the commercial power as synchronous as possible before the working condition is switched, if the switching time of the working condition is too long, the variation of the output power frequency and the output power phase of the frequency converter is large, the synchronism with the power phase and the power frequency of the commercial power is poor, and the impact on the escalator can be caused.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a method for reducing the working condition switching time of the bypass variable frequency escalator aiming at the defects of the prior art.
In order to achieve the technical purpose, the technical scheme adopted by the invention is as follows:
the invention provides a method I for reducing the working condition switching time of a bypass variable frequency escalator, wherein a control system comprises a control unit, a power frequency working contactor, a variable frequency working contactor and a motor, the control unit is internally provided with a main board and a frequency converter which are mutually connected, the output end of a power frequency power supply is connected with the input end of the motor through the power frequency working contactor, the input end of the frequency converter is connected with the output end of the power frequency power supply, the output end of the frequency converter is connected with the input end of the motor through the variable frequency working contactor, an interlocking structure is not arranged between the power frequency working contactor and the variable frequency working contactor, the main board respectively controls the output of the frequency converter, the power frequency working contactor and the variable frequency working contactor, and obtains an output feedback signal, and the:
s11, when the escalator senses that no person exists, the escalator is continuously in a frequency conversion working condition, the main board respectively controls the frequency conversion enable of the frequency converter and the frequency conversion working contactor to be continuously kept in a connection state, at the moment, the power frequency power supply is connected with the motor through the frequency converter and the frequency conversion working contactor, and the motor controls the elevator to work under the frequency conversion working condition;
s12, when the escalator senses a person, the phase locking of the frequency converter is completed, the main board cuts off the frequency conversion enabling of the frequency converter after the switching condition is met, the frequency conversion working contactor is kept in a connection state, and the elevator is separated from the frequency conversion working condition at the moment;
s13, after the frequency conversion of the frequency converter is enabled to stop working, the frequency converter feeds back a signal of stopping working to the main board, and then the main board controls the power frequency working contactor to be switched on, so that the elevator enters a power frequency working condition;
and S14, feeding back a switch-on signal to the mainboard after the power frequency working contactor is switched on, and then controlling the frequency conversion working contactor to be switched off by the mainboard.
Preferably, there is a step S111 between the step S11 and the step S12: and the mainboard sets the time delay from the stop of the variable frequency enabling to the switch-on of the power frequency working contactor through parameters.
The invention also provides a second method for reducing the working condition switching time of the bypass variable-frequency escalator, wherein a control system comprises a control unit, a power frequency working contactor, a variable-frequency working contactor and a motor, the control unit is an integrated machine with a variable-frequency function, the output end of a power frequency power supply is connected with the input end of the motor through the power frequency working contactor, the input end of the integrated machine is connected with the output end of the power frequency power supply, the output end of the integrated machine is connected with the input end of the motor through the variable-frequency working contactor, an interlocking structure is not arranged between the power frequency working contactor and the variable-frequency working contactor, the integrated machine adjusts the variable-frequency enable of the integrated machine, controls the output of the power frequency working contactor and the output of the variable-frequency working contactor respectively, and:
s21, when the escalator senses that no person exists, the escalator is continuously in a frequency conversion working condition, the all-in-one machine respectively controls the frequency conversion enable of the all-in-one machine and the frequency conversion working contactor to be continuously kept in a connection state, at the moment, the power frequency power supply is connected with the motor through the all-in-one machine and the frequency conversion working contactor, and the motor controls the elevator to work under the frequency conversion working condition;
s22, when the escalator senses a person, the phase locking of the all-in-one machine is completed, the all-in-one machine cuts off the self frequency conversion enable and keeps the frequency conversion working contactor in a connection state after meeting the switching condition, and the elevator is separated from the frequency conversion working condition at the moment;
s23, after the all-in-one machine detects that the frequency conversion enable of the all-in-one machine stops, the all-in-one machine controls the power frequency working contactor to be switched on, so that the elevator enters a power frequency working condition;
and S24, feeding back a connection signal to the integrated machine after the power frequency working contactor is connected, and controlling the frequency conversion working contactor to be switched off by the integrated machine.
Preferably, there is a step S211 between the step S21 and the step S22: the all-in-one machine sets the time delay from the stop of self variable frequency enabling to the connection of the power frequency working contactor through parameters.
Compared with the prior art, the invention cancels the electrical interlocking and the mechanical interlocking between the variable-frequency working contactor and the power-frequency working contactor, allows the variable-frequency working contactor and the power-frequency working contactor to be simultaneously attracted, and ensures that the frequency converter and the commercial power cannot be simultaneously supplied with power, thereby safely and effectively reducing the working condition switching time of the bypass escalator. And because the frequency conversion working contactor and the power frequency working contactor are at least one suction-in operation all the time when the escalator operates, a special contracting brake contactor does not need to be configured, and the existing contactor can be used for controlling the contracting brake power supply in a combined mode.
Drawings
FIG. 1 is a wiring schematic of the control system of the present invention;
FIG. 2 is a timing diagram of a conventional control for bypass variable frequency switching times;
FIG. 3 is a control timing diagram of the bypass variable frequency switching time reduction of the present invention;
FIG. 4 is a schematic diagram of the wiring for the interlocking control of the power frequency operating contactor and the variable frequency operating contactor;
FIG. 5 is a schematic diagram of the wiring for the removal of interlock control for both the line frequency operating contactor and the variable frequency operating contactor of the present invention;
fig. 6 is a schematic wiring diagram of the band-type brake power supply of the invention.
Detailed Description
Embodiments of the present invention are described in further detail below with reference to the accompanying drawings.
Referring to fig. 1, the present invention provides a method for reducing the operating mode switching time of a bypass frequency conversion escalator, wherein a control system includes a control unit MC, a power frequency operating contactor K1, a frequency conversion operating contactor K2, an upward operating contactor KU, a downward operating contactor KD, and a motor MT, the control unit MC has a main board and a frequency converter connected with each other, an output end of a power frequency power supply is connected with an input end of the motor MT through the power frequency operating contactor K1, an input end of the frequency converter is connected with an output end of the power frequency power supply, an output end of the frequency converter is connected with an input end of the motor MT through the frequency conversion operating contactor K2, and there is no interlocking structure between the power frequency operating contactor K1 and the frequency. After the ascending operation contactor KU and the descending operation contactor KD are connected in parallel, the ascending operation contactor KU and the descending operation contactor KD are integrally connected in series on a circuit formed by the power frequency working contactor K1, the frequency conversion working contactor K2 and the control unit MC, the main board respectively controls the outputs of the frequency converter, the power frequency working contactor K1, the frequency conversion working contactor K2, the ascending operation contactor KU and the descending operation contactor KD and obtains an output feedback signal, and the method comprises the following steps:
and S10, selecting the elevator to be in an ascending mode or a descending mode, if the elevator needs to ascend, switching on the ascending running contactor KU and switching off the descending running contactor KD, and if the elevator needs to descend, switching on the descending running contactor KD and switching off the ascending running contactor KU.
S11, when the escalator senses that no person exists, the escalator is continuously in a frequency conversion working condition, the main board respectively controls the frequency conversion enable of the frequency converter and the frequency conversion working contactor K2 to be continuously kept in a connection state, at the moment, the power frequency power supply is connected with the motor MT through the frequency converter and the frequency conversion working contactor K2, and the motor MT controls the elevator to work under the frequency conversion working condition.
And S12, when the escalator senses a person, the phase locking of the frequency converter is completed, and after the switching condition is met, the main board cuts off the frequency conversion enabling of the frequency converter and keeps the frequency conversion working contactor K2 in a connection state.
S13, after the frequency conversion of the frequency converter enables the work to be stopped, the frequency converter feeds back the signal of the work to the mainboard, the mainboard controls the power frequency work contactor K1 to be switched on after receiving the feedback signal, so that the elevator enters the power frequency working condition, the frequency converter and the commercial power are not supplied with power simultaneously when K1 and K2 are simultaneously attracted, and the power skipping is prevented.
And S14, after the power frequency working contactor K1 is switched on, a switching-on signal is fed back to the main board, and then the main board controls the variable frequency working contactor K2 to be switched off, so that the motor MT cannot be powered off.
Preferably, there is also step S111 between step S11 and step S12: the mainboard can make the delay time of stopping work to power frequency work contactor K1 switch-on from the frequency conversion through parameter setting, and the precision of adjustment delay time is accurate to the millisecond, and when the reasonable setting of this parameter can prevent power frequency work contactor K1 too fast to inhale, the electric current impact converter of converter output side and produce the leakage current, should leak the electric leakage protection action that can lead to the main power supply when too big, and then influence the normal use of staircase.
With continued reference to fig. 1, the present invention further provides a second method for reducing the operating mode switching time of the bypass frequency conversion escalator, the control system includes a control unit MC, a power frequency operating contactor K1, a frequency conversion operating contactor K2, an upward operating contactor KU, a downward operating contactor KD, and a motor MT, the control unit MC is an integrated machine with a frequency conversion function, an output end of a power frequency power supply is connected with an input end of the motor MT through the power frequency operating contactor K1, an input end of the integrated machine is connected with an output end of the power frequency power supply, an output end of the integrated machine is connected with an input end of the motor MT through the frequency conversion operating contactor K2, and there is no interlocking structure between the power frequency operating contactor K1 and. After an upward operation contactor KU and a downward operation contactor KD are connected in parallel, the upward operation contactor KU and the downward operation contactor KD are integrally connected in series on a circuit formed by a power frequency working contactor K1, a frequency conversion working contactor K2 and a control unit MC, the integrated machine adjusts the frequency conversion enabling of the integrated machine, and controls the output of the power frequency working contactor K1, the frequency conversion working contactor K2, the upward operation contactor KU and the downward operation contactor KD respectively, and obtains the output feedback signal, and the method comprises the following steps:
and S20, selecting the elevator to be in an ascending mode or a descending mode, if the elevator needs to ascend, switching on the ascending running contactor KU and switching off the descending running contactor KD, and if the elevator needs to descend, switching on the descending running contactor KD and switching off the ascending running contactor KU.
S21, when the escalator senses that no person exists, the escalator is continuously in a frequency conversion working condition, the all-in-one machine respectively controls the frequency conversion enable of the all-in-one machine and the frequency conversion working contactor K2 to be continuously kept in a connection state, at the moment, the power frequency power supply is connected with the motor MT through the all-in-one machine and the frequency conversion working contactor K2, and the motor MT controls the elevator to work under the frequency conversion working condition.
S22, when the escalator senses a person, the phase locking of the all-in-one machine is completed, and after the switching condition is met, the all-in-one machine cuts off the self frequency conversion enable and keeps the frequency conversion working contactor K2 in a connection state.
S23, after the all-in-one machine detects that the self frequency conversion enables and stops, the power frequency working contactor K1 is controlled to be switched on, so that the elevator enters the power frequency working condition, and therefore the all-in-one machine and the commercial power are not supplied with power simultaneously when K1 and K2 are simultaneously attracted, and electricity jumping is prevented.
And S24, feeding a connection signal back to the all-in-one machine after the power frequency working contactor K1 is connected, and controlling the frequency conversion working contactor K1 to be cut off by the all-in-one machine so as to ensure that the motor MT cannot be powered off.
Preferably, there is also a step S211 between step S21 and step S22: the all-in-one machine can stop the delay time of switching on to the power frequency working contactor K1 from the frequency conversion of self through parameter setting, and the precision of adjustment delay time is accurate to the millisecond, and when the reasonable setting of this parameter can prevent power frequency working contactor K1 from absorbing at the excessive speed, the current impact all-in-one machine of all-in-one machine output side and produce the leakage current, should leak the current and too big the earth leakage protection action that can lead to the main power supply, and then influence the normal use of staircase.
In the two methods for reducing the working condition switching time of the bypass variable frequency escalator, the variable frequency enable and the output time sequence of the contactor are shown in table 1, and the control steps of the two methods can be visually seen from table 1, wherein ■ represents output, and □ represents no output.
Step (ii) of Variable frequency enable K2 K1
S11/S21
S12/S22
S13/S23
S14/S24
TABLE 1 frequency conversion enable and contactor output timing table
In the prior art, the power frequency working contactor K1 and the variable frequency working contactor K2 are interlocked, but in the two methods, the power frequency working contactor K1 and the variable frequency working contactor K2 are not interlocked. Next, the present invention compares the duty switching time required for the interlocking of K1 and K2 with the duty switching time required for the non-interlocking of K1 and K2.
Referring to fig. 2 and 4 in combination, in the prior art, the wiring is performed according to the schematic diagram shown in fig. 4, the control timing diagram is shown in fig. 2, the trace is folded upward to indicate output, and the trace is folded downward to indicate stopping output. The interlocking between the power frequency working contactor K1 and the variable frequency working contactor K2 means that K1 and K2 cannot be switched on simultaneously. After the switching condition of the phase is met, the variable frequency enable and the variable frequency working contactor K2 are cut off at the same time, and the delay time from the stop of the output of the control unit MC to the action of the K2 is T1. After the K2 is completely activated, the K1 starts to be turned on, the delay time from the output of the control unit MC to the activation of K1 is T2, and the power loss time Δ T1 is T1+ T2. The delay time from the stop of the control unit MC to the receipt of the feedback signal of the variable frequency enable stop is contained in Δ T1 and is therefore ignored.
Referring to fig. 3 and 5 in combination, in the two methods of the present invention, the wiring is performed according to the schematic diagram shown in fig. 5, the control timing diagram is shown in fig. 3, the upward folding of the trace indicates output, and the downward folding of the trace indicates stopping output. The power frequency working contactor K1 and the variable frequency working contactor K2 are not interlocked and are independent of each other, namely K1 and K2 can be simultaneously connected, and two arc extinguishing circuits respectively formed by connecting a capacitor and a resistor in series are respectively connected in parallel to the coil of the power frequency working contactor K1 and the two sides of the coil of the variable frequency working contactor K2. After the phase switching condition is met, if the control unit MC is not an all-in-one machine but consists of a main board and a frequency converter, the working condition switching is completed according to S11-S14; if the control unit MC is an all-in-one machine, the switching of the working conditions is completed according to S21-S24. When the control unit MC receives the feedback signal of the frequency conversion enabling stop work, the control unit MC starts to control the K1 to be switched on, so that the delay time from the stop of the output of the control unit MC to the time when the feedback signal of the frequency conversion enabling stop work is received is T3. The delay time from the output of the control unit MC to the actuation of K1 is T4, and since K1 and K2 may be turned on simultaneously, the operating condition has been successfully switched at step S13 or S23, so the power-off time Δ T2 is T3+ T4.
Comparing the action times of Δ T1 and Δ T2, and both T2 and T4 are contactors, both equal and not adjustable, the main difference being T1 and T3. For a control unit MC composed of a main board and a frequency converter, if the frequency converter adopts a communication mode, taking a CAN bus as an example, T3 CAN be controlled within 5ms by using a baud rate of 25000 bit/s; if the frequency converter adopts mos tube output and adds the input filtering time of the main board of the escalator, the T3 can be controlled within 10 ms. For the all-in-one machine type control unit MC, T3 is an extremely short processing period of the central processing unit and can be ignored. And T1 is the time from the power on of the contactor coil to the contact action, and is generally 10ms-20ms, and for a contactor with large current, T1 may be longer. Therefore, T1 is inevitably larger than T3, and Delta T1 is inevitably larger than Delta T2, the two methods of the invention can successfully reduce the power-off time of the motor, namely reduce the working condition switching time of the bypass frequency conversion escalator, the vibration of the escalator is smaller, and the comfort of pedestrians can be improved on the basis of not increasing the control cost. Wherein CAN is an abbreviation of Controller Area Network, and is a serial communication protocol standardized by ISO international standards, and mos tube is a metal (metal), oxide (oxide), semiconductor (semiconductor) field effect transistor, or is called a metal-insulator, semiconductor.
Referring to fig. 6, since the power frequency operating contactor K1 and the variable frequency operating contactor K2 can be simultaneously connected, the existing two contactors can be combined with the band-type brake power supply YBK according to the circuit shown in fig. 6, so as to effectively control the band-type brake power supply YBK without configuring a special band-type brake contactor. In the control mode, at least one of the K1 and the K2 is switched on in the operation process, so that the band-type brake power supply YBK is always electrified in the process of switching the working conditions.
Compared with the prior art, the invention cancels the electrical interlocking and the mechanical interlocking between the variable-frequency working contactor and the power-frequency working contactor, allows the variable-frequency working contactor and the power-frequency working contactor to be simultaneously attracted, and ensures that the frequency converter and the commercial power cannot be simultaneously supplied with power, thereby safely and effectively reducing the working condition switching time of the bypass escalator.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may be made by those skilled in the art without departing from the principle of the invention.

Claims (4)

1. The method for reducing the working condition switching time of the bypass variable frequency escalator is characterized in that the method comprises the following steps:
s11, when the escalator senses that no person exists, the escalator is continuously in a frequency conversion working condition, the main board respectively controls the frequency conversion enable of the frequency converter and the frequency conversion working contactor to be continuously kept in a connection state, at the moment, the power frequency power supply is connected with the motor through the frequency converter and the frequency conversion working contactor, and the motor controls the elevator to work under the frequency conversion working condition;
s12, when the escalator senses a person, the phase locking of the frequency converter is completed, the main board cuts off the frequency conversion enabling of the frequency converter after the switching condition is met, the frequency conversion working contactor is kept in a connection state, and the elevator is separated from the frequency conversion working condition at the moment;
s13, after the frequency conversion of the frequency converter is enabled to stop working, the frequency converter feeds back a signal of stopping working to the main board, and then the main board controls the power frequency working contactor to be switched on, so that the elevator enters a power frequency working condition;
and S14, feeding back a switch-on signal to the mainboard after the power frequency working contactor is switched on, and then controlling the frequency conversion working contactor to be switched off by the mainboard.
2. The method for reducing the working condition switching time of the bypass variable frequency escalator as claimed in claim 1, characterized in that: there is also step S111 between step S11 and step S12: and the mainboard sets the time delay from the stop of the variable frequency enabling to the switch-on of the power frequency working contactor through parameters.
3. The method for reducing the working condition switching time of the bypass variable-frequency escalator is characterized in that a control system comprises a control unit, a power frequency working contactor, a variable-frequency working contactor and a motor, wherein the control unit is an all-in-one machine with a variable-frequency function, the output end of a power frequency power supply is connected with the input end of the motor through the power frequency working contactor, the input end of the all-in-one machine is connected with the output end of the power frequency power supply, the output end of the all-in-one machine is connected with the input end of the motor through the variable-frequency working contactor, an interlocking structure is not arranged between the power frequency working contactor and the variable-frequency working contactor, the all-in-one machine adjusts the self variable-frequency enabling function, controls the output of the power frequency working:
s21, when the escalator senses that no person exists, the escalator is continuously in a frequency conversion working condition, the all-in-one machine respectively controls the frequency conversion enable of the all-in-one machine and the frequency conversion working contactor to be continuously kept in a connection state, at the moment, the power frequency power supply is connected with the motor through the all-in-one machine and the frequency conversion working contactor, and the motor controls the elevator to work under the frequency conversion working condition;
s22, when the escalator senses a person, the phase locking of the all-in-one machine is completed, the all-in-one machine cuts off the self frequency conversion enable and keeps the frequency conversion working contactor in a connection state after meeting the switching condition, and the elevator is separated from the frequency conversion working condition at the moment;
s23, after the all-in-one machine detects that the frequency conversion enable of the all-in-one machine stops, the all-in-one machine controls the power frequency working contactor to be switched on, so that the elevator enters a power frequency working condition;
and S24, feeding back a connection signal to the integrated machine after the power frequency working contactor is connected, and controlling the frequency conversion working contactor to be switched off by the integrated machine.
4. The method for reducing the working condition switching time of the bypass variable frequency escalator as claimed in claim 3, characterized in that: there is also step S211 between step S21 and step S22: the all-in-one machine sets the time delay from the stop of self variable frequency enabling to the connection of the power frequency working contactor through parameters.
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