JP4298448B2 - Escalator control device - Google Patents

Description

  The present invention relates to an escalator control device that can change the operating speed of an escalator.

  In general, the escalator control device includes an escalator body mechanism and an escalator drive control system as shown in FIG. In the escalator body mechanism, an endless step chain 103 is rotatably spanned across the upper sprocket 101 and the lower sprocket 102, and a number of steps 104 are suspended on the step chain 103, and further suspended on the step chain 103. Side plates 105 with moving handrails are erected on both sides of a large number of steps 104.

  On the other hand, in the escalator drive control system, for example, an electric motor 112 is attached to the upper sprocket 101 via a transmission 111, and required electric power for driving is supplied to the electric motor 112. That is, a converter 114 that converts AC power from the three-phase AC power source 113 into DC power of a predetermined voltage, a capacitor 115 that stores the converted DC power, and the DC power stored in the capacitor 115 is converted into a required AC. An inverter device 116 that converts the electric power and supplies the electric motor 112 is provided.

Further, a speed setting means 117 for setting the traveling speed of the escalator body mechanism, a current detection means 118 for detecting an inverter output current provided on a power line from the inverter device 116 to the electric motor 112, and a detection current of the current detection means 118 are excessive. A protection circuit 119 that outputs a signal for stopping the escalator when a current (overload) state is detected is provided. Reference numeral 120 denotes inverter control means, which generates a speed pattern that travels at the speed set value set by the speed setting means 117, and outputs a frequency command signal and a V / F control signal in accordance with this speed pattern. The inverter element of the device 116 is controlled, and the rotational speed of the motor 112 is controlled. The rotational driving force of the electric motor 112 is transmitted to the step chain 103 via the transmission 111 and the upper sprocket 101, and the step 104 moves in a predetermined direction as the step chain 103 is rotationally driven ( Patent Document 1).
JP 2000-198656 A

  By the way, the following problems have been pointed out in the escalator control apparatus as described above.

  In the escalator, when there is no passenger on the step 104, the balance is in the best balance with the lightest load, and the load on the inverter device 116 and the electric motor 112 increases as the number of passengers increases in the ascending operation. For example, in the escalator ascending operation, when the speed is increased from the current speed when no passengers are riding, there is no problem from the torque characteristics of the motor 112 because the load is light. Further, when the speed is increased, the inverter device 116 can output a current necessary for acceleration to the electric motor 112, and thus can be accelerated to a target speed.

  However, even though the passengers are almost full, more passengers are trying to get in. In such a load state, in order to improve the passenger's transportation capacity, when the speed is increased from the current speed, a larger acceleration current is required than in the no-load state.

This is expressed as follows. Now, assuming that the full load acceleration torque is _TST ,
T _ST = T _MAX + A100
It is represented by T _MAX represents the maximum acceleration torque, and A100 represents the acceleration torque. Of these, the maximum acceleration torque T _MAX is expressed as the sum of the required torques during full load steady running, and the acceleration torque A100 is expressed in the following equation by the motor shaft equivalent GD ² , coefficient k, and acceleration time. It is expressed by dT, the difference dN between the motor rotation speeds before and after acceleration.

A100 = (GD ² 100 / k) × (dN / dT)
Hereinafter, a specific example will be described.

For example, in the case of a system in which the motor 112 having the rated torque Tm = 180 Nm and the acceleration maximum torque T _MAX = 370 Nm in the full load state and the constant GD ² 100 / k = 16.5 determined by the mechanism, the rotational speed per minute Is increased from 15 rpm to 22.5 rpm, that is, when acceleration is performed for 1.25 s per second, acceleration torque A100 = 99 Nm. When 260% of the motor rated torque is output and such a sudden load fluctuation is applied, for example, the I (current) -T (torque) characteristics of the motor 112 exceed the linear portion as shown in FIG. Therefore, it can be considered that the vehicle will stall.

Further, as shown in FIG. 18, current 50A when the rated torque Tm, 120A when the total load torque T _MAX, and a 175A when full load acceleration torque T _ST. If the inverter 116 with a rated current of 80 A is selected, it will be 218% at 175 A, and if it has an overload detection characteristic as shown in FIG. 19, it can be operated for 20 to 30 seconds and will not stop. . However, as shown in the torque characteristics shown in FIG. 18, when the torque reaches 280%, since it is in a stalled state, an attempt is made to increase the current further, so an overcurrent occurs and the motor stops due to a failure. There's a problem.

  In addition, it is possible to select the motor 112 and the inverter device 116 having a slightly higher rating assuming the above situation, but in the case of an escalator, in order to store the device in the truss, There are problems such as being unable to install due to dimensional problems, increasing the cost of the device, and increasing the capacity of the power supply equipment. Although the acceleration may be always reduced, if the worst case is taken as a reference, the acceleration time is delayed, which is not preferable for use.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an escalator control device that can avoid stall during acceleration and can continue operation stably without being stopped even in an overcurrent state.

In order to solve the above-described problems, the present invention provides an escalator having steps that are connected endlessly after converting three-phase AC power to DC power, and then converting the AC power into required AC power by an inverter device. An escalator control device that can vary the traveling speed of
Current detection means for detecting the load current supplied from the inverter device to the motor, acceleration / deceleration setting means in which acceleration / deceleration that can be accelerated / decelerated according to the load condition is set in advance, and when the escalator is accelerated or decelerated And an inverter control means for reading the acceleration / deceleration data according to the load status from the acceleration / deceleration setting means based on the load current detected by the current detection means and controlling the acceleration / deceleration of the inverter device. It is a configuration.

  With this configuration, when accelerating or decelerating, the inverter device can be accelerated or decelerated at an acceleration / deceleration that can be accelerated or decelerated according to a predetermined load condition with respect to the output rating of the inverter device. Since the deceleration control is performed, the escalator can be stably operated without being stalled during acceleration or being stopped in an overcurrent state.

In addition, if speed detection means for detecting the traveling speed of the escalator from the rotational speed of the electric motor is newly provided in the above configuration, the traveling speed detected by the speed detecting means and the speed command accompanying the acceleration are By comparing, and stopping the escalator when the speed difference exceeds a predetermined value, it is possible to avoid the problem of stalling when accelerating or serious failure stop due to an overcurrent state after stalling,
Furthermore, if a display means for displaying the operating state of the escalator or a voice guidance means for guiding the operating state of the escalator is provided, for example, the passenger can recognize that the driving situation changes during acceleration, and the escalator stops suddenly. Thus, it is possible to prevent the passenger from falling.

  INDUSTRIAL APPLICABILITY The present invention can provide an escalator control device that can maintain stable operation without stalling during acceleration or without stopping even in an overcurrent state.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1 is a block diagram showing a first embodiment of an escalator control device according to the present invention.

  This escalator control device is configured by an escalator body mechanism and an escalator drive control system. As the escalator body mechanism, for example, an endless step chain 13 is rotatably spanned across the upper sprocket 11 and the lower sprocket 12, A large number of steps 14 for passengers to ride are suspended on the step chain 13, and side plates 15 with moving handrails are erected on both sides of the numerous steps 14. The escalator body mechanism includes various forms of escalators based on user requests, manufacturer specifications, etc., and the present invention is not limited to FIG. 1 and can be applied to any escalator. Needless to say.

  The escalator drive control system includes a converter 22 that converts AC power from the three-phase AC power source 21 into DC power of a predetermined voltage, a capacitor 23 that stores the converted DC power, and a capacitor 23 that stores the converted DC power. An inverter device 24 that converts DC power into required AC power, an electric motor 25 that receives the required AC power converted by the inverter device 24 and generates a rotational driving force, and a rotational speed of the electric motor 25 is set to a required speed. The rotational drive force of the electric motor 25 or the transmission 26 is transmitted to the step chain 13 via the upper sprocket 11 of the escalator body mechanism, and the step 14 is moved in a predetermined direction. It has a configuration.

  Further, the escalator drive control system includes speed setting means 27 for setting the traveling speed of the escalator body mechanism, and current detection means 28 for detecting an inverter output current (load current) provided on a power line from the inverter device 24 to the electric motor 25. And a protection circuit 29 that outputs a signal that stops the escalator when an overcurrent (overload) state is detected from the detection current of the current detection means 28, and these speed setting means 27, current detection means 28 are provided. And each output of the protection circuit 29 is introduced into the inverter control means 30. The inverter control means 30 is connected in advance with a rewriteable / readable acceleration / deceleration setting unit 31 for setting different acceleration / deceleration data that can be accelerated / decelerated according to the load state.

  The inverter control means 30 generates a speed pattern that travels at the speed set value set by the speed setting means 27, and outputs a frequency command signal and a V / F control signal according to the speed pattern to output the inverter device 24. Is controlled, and the rotational speed of the electric motor 25 is controlled.

  Next, the operation of the escalator control device as described above will be described with reference to FIGS.

First, an example in which the escalator is accelerated will be described. Now, considering the same as the conventional apparatus, in the conventional example, the example in which the rotational speed of the electric motor is accelerated from 15 rpm to 22.5 rpm (acceleration time 1.25 s) has been described. If it is 10, since the acceleration time is 1.25 s, the acceleration torque A100 = 9.9 Nm. Further, as explained in the conventional example, since the full load torque T _MAX = 370 Nm, the full load acceleration torque T _ST = 379.9 Nm (211% of the rating) is obtained, and acceleration is possible as is apparent from FIG. Is speed. On the other hand, the protection circuit 29, if it has an overload protection characteristics as shown in FIG. 19, next to the inverter output current 155% of the T _ST, and detects an overload state 60s, protection during acceleration Does not work.

  Although the above example has described acceleration at maximum load, in the device of the present invention, a plurality of acceleration / deceleration data that can be accelerated according to the load state is set in the acceleration / deceleration setting unit 31 in advance. Since this load state can be considered to be only a load fluctuation due to increase or decrease of passengers with little mechanical change, the load state can be determined from the inverter current detected by the current detection means 28.

  FIG. 2 is a block diagram showing a specific example of detecting a load condition or load current.

  In the figure, IUF, IVF, and IWF are U-phase, V-phase, and W-phase currents of the electric motor 25 and are acquired by the current detection means 28. Then, for example, the inverter control means 30 obtains square calculation elements 41U, 41V, and 41W that calculate the square values of the respective phases by multiplying the detected currents acquired from the respective phases, and the square values of these respective phases. An addition element 42 for addition, a gain adjustment unit 43 for obtaining a square root of the addition value of the three-phase square values by gain adjustment, a filter 44 for filtering and sampling the output of the gain adjustment unit 43, and a fixed period T The circuit element 45 is configured to take the sum total of n samples, and to extract the load state of the period T with respect to the sum, that is, the average load current ILD.

  Next, FIG. 3 is a flowchart for explaining the operation when the escalator is accelerated.

  Assume that the escalator is traveling at the rated speed V in the upward direction. In this state, a speed setting value is input from the speed setting means 27. The inverter control means 30 takes in the speed set value from the speed setting means 27 (S1), and then determines whether or not there is a shift command (S2). Here, for example, when it is determined that there is an acceleration command, which is a shift command, for example, the load current value ILD is detected according to the load detection example shown in FIG. 2 (S3), and the acceleration / deceleration setting unit 31 responds to the load current value ILD. Acceleration acceleration α is read (S4), and acceleration is started while changing the frequency command to match the acceleration α (S5).

  Then, the process proceeds to the next step S6, where it is confirmed whether or not the frequency command value has been changed to the target frequency (S6). If the frequency command value is not yet reached, the acceleration operation is continued. On the other hand, when the frequency command value reaches the target value, the increase control of the frequency command value is terminated, and the steady running is continued while maintaining a constant frequency command value (S7).

  Therefore, according to the above-described embodiment, when accelerating or decelerating the escalator, the inverter is accelerated and decelerated at an acceleration / deceleration that can be accelerated / decelerated according to a predetermined load condition with respect to the output rating of the inverter device 24. Since the device 24 is subjected to acceleration / deceleration control, for example, it is possible to continue operation without stalling during acceleration or without stopping in an overcurrent state.

  In addition, it is possible to realize the present invention at low cost without increasing the capacity of the power supply facility without selecting the inverter device 24 having a relatively high rating and without changing the shape of the device so that the inverter device 24 can be accelerated.

(Second Embodiment)
FIG. 4 is a block diagram showing a second embodiment of the escalator control device according to the present invention. In the figure, the same or equivalent parts as in FIG. 1 are denoted by the same reference numerals, and detailed description will be given in FIG.

  This escalator control device is composed of an escalator body mechanism and an escalator drive control system, and the escalator body mechanism includes an upper sprocket 11, a lower sprocket 12, a step chain 13, a number of steps 14, and a moving handrail as in FIG. The side plate 15 is constituted by other necessary components.

  On the other hand, the escalator drive control system has almost the same configuration as that shown in FIG. 1, so that the description will be given. In particular, speed detection means 32 for detecting the rotational speed of the electric motor 25 or the running speed of the escalator is provided. The travel speed detected by the speed detection means 32 is input to the inverter control means 30.

  Next, the operation of the above apparatus will be described with reference to FIG.

  Assume that the escalator is traveling at the rated speed V in the upward direction. In this state, a speed setting value is input from the speed setting means 27. The inverter control means 30 takes in the speed set value from the speed setting means 27 (S11), and then determines whether or not there is a shift command (S12). Here, when it is determined that an acceleration command, for example, a shift command is input, the load current value ILD is detected according to, for example, the load detection example shown in FIG. 2 (S13), and the acceleration / deceleration setting unit 31 determines the load current value ILD. A corresponding acceleration α that can be accelerated is read (S14), and acceleration is started while changing the frequency command to match the acceleration α (S15).

  As the acceleration starts, the speed detection means 32 detects the travel speed (S16), compares the speed command (frequency command) with the detected travel speed (S17), and the speed difference exceeds a predetermined reference value. Or whether it is within the reference value. If the speed difference exceeds a predetermined reference value, the escalator is stopped and the process ends (S18). On the other hand, if it is within the reference value, the acceleration is continued while the speed is detected until the acceleration is completed (S19). Then, when the increase control of the frequency command value, and hence the acceleration, is finished, the steady running is continued while maintaining a constant frequency command value (S20).

  Therefore, according to the embodiment as described above, the speed detecting means 32 for newly detecting the traveling speed of the electric motor 25 is provided, and the traveling speed detected by the speed detecting means 32 during acceleration and the speed command ( Frequency command) and stopping the escalator when the speed difference exceeds a predetermined value, it may cause a stall when accelerating, or cause a serious failure stop due to an overcurrent condition after the stall. Can be avoided and service can be provided continuously.

(Third embodiment)
Since the escalator control device according to the present invention is the same as the configuration shown in FIG. 1 or FIG. 4, those configurations are omitted here, and the operation of the control device will be particularly described with reference to FIG. 6.

  In this escalator control device, it is assumed that the escalator is traveling at the rated speed V in the upward direction. In this state, a speed setting value is input from the speed setting means 27. The inverter control means 30 takes in the speed set value from the speed setting means 27 (S21), and then determines whether or not there is a shift command (S22). Here, when it is determined that a speed change command, for example, an acceleration command is input, the current detection means 28 detects the load current value ILD (S23), and the set current corresponding to the load current value ILD and the speed set value. The values are compared (S24). As a result of the comparison, when the load current value ILD exceeds the set current value, the vehicle travels normally without acceleration (S25). If the load current value ILD does not exceed the set current value, the acceleration α for the load current value ILD is read from the acceleration / deceleration setting unit 31 (S26), and the frequency command is changed to match the acceleration α. Acceleration is started (S27).

  Then, the process proceeds to the next step S28, where it is confirmed whether or not the frequency command value has been changed to the target frequency. If the frequency command value has not yet been reached, the acceleration operation is continued. On the other hand, when the frequency command value reaches the target value, the increase control of the frequency command value is terminated, and the steady running is continued while maintaining a constant frequency command value (S25).

  It should be noted that the load state may be detected during steady running, and the speed change command may not be accepted when the load current value exceeds the set value.

  Therefore, according to the embodiment as described above, in a case where a predetermined load state is exceeded during acceleration, stalling is prevented by not performing acceleration operation, and stalling during acceleration causes overcurrent state In this way, it is possible to avoid problems such as a serious failure stop and provide a stable service.

(Fourth embodiment)
FIG. 7 is a diagram for explaining a fourth embodiment of the escalator control device according to the present invention, and particularly a diagram showing a configuration of a safety device.

  The safety device of the escalator is used for control means abnormality detection 1 (immediate stop mode) to detect as a serious failure at the time of overcurrent detection, speed abnormality, etc., at the time of detecting an overload state of the electric motor 25 or an asynchronous detection of handrail speed. In addition to the abnormality detection circuit in the inverter control means 30 that performs the control means abnormality detection 2 (non-immediate stop mode) to detect, a safety circuit system and an operation circuit system are provided.

  The safety circuit system includes a safety circuit 51, an inlet switch 52 that is turned on when the hand is pulled into the handrail entry port, a skirt guard switch 53 that is turned on when being sandwiched between the skirt guard and the step, and an emergency operation immediately. It consists of elements such as an emergency stop button 54 that stops the escalator and a contact 55 that is linked to a serious failure detected by the inverter control means 30 (control means abnormal failure 1). When the contact of the control means abnormality detection 1 by the abnormality detection of the means 30 is turned off, the safety circuit 51 is turned off. That is, the control means abnormal fault 1 is based on a serious fault detected by the inverter control means 30 such as overcurrent detection or speed abnormality, and turns off when any of them turns on.

  The operation circuit system is configured such that, in addition to the operation circuit 56, the contact of the safety circuit 51 is in the condition of the operation circuit, and the operation circuit 56 is turned off when the safety circuit 51 is turned off. Further, the contact point of the operation circuit 56 is a condition for energizing the brake coil 57. When the operation circuit 56 is turned on, the brake is released and the electric motor 25 can be operated.

  The control means abnormality detection 2 is a condition that does not need to be stopped instantaneously, such as handrail unsynchronization or overload detection. If any of these turns on, the control means abnormality detection 2 is turned off.

  Next, operation | movement of the elevator control apparatus using a safety device is demonstrated with reference to FIG.

  When the operation of the escalator starts, the inverter control means 30 takes in the traveling speed set value set in the speed setting means 27, takes out a frequency command signal that matches the speed pattern of this speed set value, and It is assumed that the motor 25 is controlled to control the rotation speed of the electric motor 25 and is traveling at the rated speed V in the upward direction (S31).

  In this state, an abnormality monitoring process for fetching necessary information for each required cycle is performed (S32), it is determined whether there is an abnormality from the income information (S33), and if no abnormality is detected, step S31 is performed. Returning to, the same processing is repeated, and when an abnormality is detected, it is determined whether the abnormality detection content is the control means abnormality detection 1 or the control means abnormality detection 2 (S34).

  Here, if the abnormality detection content is control means abnormality detection 1, that is, level 1, the control of the inverter 24 is immediately stopped (S35), and the process proceeds to step S36. In step S36, since the control means abnormality detection 1 contact is turned off, the operation circuit 56 is turned off and the inverter control is stopped, so that the escalator is stopped by the brake.

  On the other hand, when the abnormality detection content is the control means abnormality detection 2, the deceleration is read from the acceleration / deceleration setting unit 31 (S37). In the acceleration / deceleration setting unit 31, a deceleration smaller than the deceleration by the brake is set in advance. A deceleration deceleration pattern read in step S37 is generated, and deceleration operation is performed (S38). Then, when the advance speed of the escalator falls to 0, the brake is applied and stopped (S39).

  Therefore, according to the embodiment as described above, in an abnormal mode that does not require an immediate stop when an abnormality is detected, the escalator can be stopped by stopping along a deceleration pattern smaller than the deceleration of the brake. It is possible to prevent passengers from falling over and to ensure the reliability of passengers.

(Fifth embodiment)
FIG. 9 is a block diagram showing a fifth embodiment of the escalator control device according to the present invention. In the figure, the same or equivalent parts as those in FIGS. 1 and 4 are denoted by the same reference numerals, and the details will be described with reference to FIGS.

  In this embodiment, display means 34 for displaying the operating state of the escalator is connected to inverter control means 30 constituting the escalator control device shown in FIG.

  Next, the operation of the above apparatus will be described with reference to FIG.

  When the operation of the escalator starts, the inverter control means 30 takes in the traveling speed set value set in the speed setting means 27 (S41), and then determines whether or not a shift command is input (S42). Here, when there is no shift command, the vehicle travels at the rated speed V, for example, based on the speed setting value. If it is determined in step S42 that a shift command has been input, for example, the load current value ILD is detected according to the load detection method described in FIG. 2 (S43), and the set current corresponding to the load current value ILD and the speed set value is detected. The values are compared (S44). As a result of this comparison, when the load current value ILD exceeds the set current value, a message such as “current speed cannot be changed” is displayed on the display means 34 (S45), and the steady running is continued (S46). In addition, when the load current detected at the normal time exceeds the set value, a message not accepting the speed change command may be displayed.

  If the load current value ILD does not exceed the set current value, the acceleration with respect to the load current value ILD is read from the acceleration / deceleration setting unit 31 (S47), and acceleration is performed while changing the frequency command to match this acceleration. Start (S48).

  Then, the process proceeds to the next step S49, where it is confirmed whether or not the frequency command value has been changed to the target frequency. If the frequency command value has not yet been reached, the acceleration operation is continued. On the other hand, when the frequency command value reaches the target value, the increase control of the frequency command value is terminated, and the steady running is continued while maintaining the constant frequency command value (S46).

  Therefore, according to the embodiment as described above, when it is determined that the acceleration operation is not performed by newly providing the display means 34, the determination content is displayed on the display means 34, so that the operator recognizes the driving state. And since a steady driving | running | working is continued without changing speed, the safe driving | running of an escalator can be ensured.

(Sixth embodiment)
FIG. 11 is a block diagram showing a sixth embodiment of the escalator control device according to the present invention. In the figure, the same or equivalent parts as in FIG. 1 are denoted by the same reference numerals, and will be described in detail with reference to FIG.

  In this embodiment, voice guidance means 35 for notifying voice guidance is connected to inverter control means 30 constituting the escalator control device shown in FIG. Therefore, since the other structure is the same as that of FIG. 1, description of the said structure is abbreviate | omitted here.

  Next, the operation of the above apparatus will be described with reference to FIG.

  This escalator operates in substantially the same procedure as in FIG. 1, but particularly in FIG. 1, when it is determined in step S2 that a shift command has been input, the load current value ILD is calculated according to the load detection method shown in FIG. Detecting (S3), reading the acceleration α with respect to the load current value ILD from the acceleration / deceleration setting unit 31 (S4), and starting the acceleration operation while changing the frequency command to match the acceleration α (S5). In this embodiment, the inverter control means 30 generates a voice output signal from the voice guidance means 35 immediately before the acceleration operation, for example, “Please note that the escalator is accelerated” (S51). Acceleration operation is started.

  Therefore, according to the embodiment as described above, since accelerating when accelerating the escalator, the passenger is surprised by making the passenger using the escalator recognize the acceleration operation in advance, It can be prevented from falling.

(Seventh embodiment)
This escalator control device according to the present invention is applied to the escalator control device shown in FIG. 4, that is, the configuration provided with the speed detection means 32, and will be described in detail with reference to FIGS.

  FIG. 13 is a diagram showing a speed command output from the inverter control means 30, and FIG. 14 is a flowchart for explaining the operation of the escalator control device.

  The operation of this escalator control device executes the same processing from step S11 to step S16 in FIG.

  Here, with the start of the acceleration operation, the traveling speed is detected from the output of the speed detecting means 32 (S16), and the detected traveling speed is compared with the speed command (frequency command) (S61). Whether the speed difference exceeds a predetermined reference value or within a reference value. When the speed difference exceeds a predetermined reference value, the deceleration set in the acceleration / deceleration setting unit 31 is read (S62). This deceleration is set with the same inclination as the acceleration as shown in FIG. Then, if the speed command is decelerated according to the read deceleration and returns to the speed at the start (S63), the process proceeds to step S64, and steady running is performed at the original speed. If it does not return to the starting speed, it continues to decelerate.

  On the other hand, if the speed difference between the two speeds is within a predetermined reference value in step S61, acceleration is continued while detecting the speed until the end of acceleration (S65). Then, when the increase control of the frequency command value, and thus the acceleration, is finished, the steady running is continued while maintaining the constant frequency command value (S64).

  Therefore, according to the embodiment as described above, if the speed does not increase when accelerating the escalator, the operation is continued at the original speed even if the acceleration is stopped. It can be prevented from falling.

(Eighth embodiment)
The escalator control device according to the present invention is applied to the escalator control device having the configuration shown in FIGS. 1 and 4 and will be described in detail with reference to FIGS. 15 and 16.

  FIG. 15 is a diagram showing a speed command output from the inverter control means 30, and FIG. 16 is a flowchart for explaining the operation of the escalator control device.

  The operation of this escalator control device will be described in FIG. 3 since steps S1 to S5 execute the same processing as in FIG.

  In this control device, the load current value ILD is detected from the current detection means 28, the acceleration α with respect to the load current value ILD is read from the acceleration / deceleration setting unit 31 (S4), and the frequency command is adjusted to this acceleration α. The acceleration operation is started while changing (S5).

  Thereafter, the process proceeds to step S71, and the load current value ILD is detected from the current detection means 28. Assume that more passengers enter during the acceleration of this escalator. Therefore, the load current value ILD detected by the current detection means 28 and the current limit value corresponding to the acceleration α with respect to the load current value ILD set in the acceleration / deceleration setting unit 31 are detected, and these load current value ILD and current limit value are detected. To determine whether the current difference between these two current values exceeds the reference value or is within the reference value (S72).

  Here, if the reference value is exceeded, after the speed command is fixed (S73), the process returns to step S3, the load current value ILD is detected by the current detector 28, and the acceleration is reloaded. On the other hand, if it is within the reference value, the acceleration operation is continued if the frequency command value has not yet reached the target frequency (S74). Then, when the frequency command value reaches the target value, the increase control of the frequency command value is terminated, and the steady running is continued while maintaining a constant frequency command value (S75).

  Therefore, according to the above-described embodiment, when the escalator is accelerated, if the load does not increase due to an increase in the load, such as passengers getting on the way, the escalator is changed again by changing the acceleration again. It can be accelerated.

  In addition, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention.

  In addition, the embodiments can be implemented in combination as much as possible, and in that case, the effect of the combination can be obtained. Further, each of the above embodiments includes various higher-level and lower-level inventions, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements. For example, when an invention is extracted because some constituent elements can be omitted from all the constituent elements described in the means for solving the problem, the omitted part is used when the extracted invention is implemented. Is appropriately supplemented by well-known conventional techniques.

The block diagram which shows one Embodiment of the escalator control apparatus which concerns on this invention. The block diagram which shows one specific example which detects load current. The flowchart explaining operation | movement of the escalator control apparatus shown in FIG. The block diagram which shows other embodiment of the escalator control apparatus which concerns on this invention. The flowchart explaining operation | movement of the escalator control apparatus shown in FIG. The flowchart for demonstrating other embodiment of the escalator control apparatus shown in FIG. 1 or FIG. The block diagram which shows other embodiment of the escalator control apparatus which concerns on this invention. The flowchart explaining operation | movement of the escalator control apparatus shown in FIG. The block diagram which shows other embodiment of the escalator control apparatus which concerns on this invention. The flowchart explaining operation | movement of the escalator control apparatus shown in FIG. The block diagram which shows other embodiment of the escalator control apparatus which concerns on this invention. The flowchart explaining operation | movement of the escalator control apparatus shown in FIG. Time chart for speed command. The flowchart explaining operation | movement of the escalator control apparatus which concerns on this invention. Time chart for speed command. The flowchart explaining operation | movement of the escalator control apparatus which concerns on this invention. The block diagram which shows the conventional escalator control apparatus. The torque characteristic figure of a conventional apparatus. The thermal characteristic figure of a conventional apparatus.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 13 ... Step chain, 14 ... Step, 15 ... Side plate, 21 ... Three-phase alternating current power supply, 22 ... Converter, 24 ... Inverter device, 25 ... Electric motor, 26 ... Transmission, 27 ... Speed setting means, 28 ... Current detection means, DESCRIPTION OF SYMBOLS 29 ... Protection circuit, 30 ... Inverter control means, 31 ... Acceleration / deceleration setting part, 32 ... Speed detection means, 34 ... Display means, 35 ... Voice guidance means.

Claims (8)

In an escalator control device that converts the three-phase AC power into DC power, converts it to the required AC power with an inverter device, supplies it to the motor, and makes it possible to vary the traveling speed of the escalator having steps connected endlessly ,
Current detection means for detecting a load current supplied to the electric motor from the inverter device;
Acceleration / deceleration setting means in which acceleration / deceleration capable of acceleration / deceleration according to the load situation is set in advance;
When the escalator is accelerated or decelerated, acceleration / deceleration control is performed by reading acceleration / deceleration data that can be accelerated / decelerated according to the load status from the acceleration / deceleration setting unit based on the load current detected by the current detection unit. An escalator control device comprising an inverter control means for performing the operation. In the escalator control device according to claim 1,
Further provided is a speed detection means for detecting the traveling speed of the escalator from the rotational speed of the electric motor,
The inverter control means controls the inverter device so that the escalator stops when a traveling speed detected by the speed detecting means exceeds a predetermined speed difference with respect to a speed command for acceleration. Escalator control device. In the escalator control device according to claim 1 or 2,
The inverter control means does not perform acceleration control of the inverter device in spite of an acceleration command when a load current detected by the current detection means exceeds a predetermined set value during steady operation. Control device. In the escalator control device according to any one of claims 1 to 3,
The inverter control means is provided with a safety device having a first abnormality detection system that detects a serious failure to be stopped immediately and a second abnormality detection system that does not require an immediate stop. In the second abnormality detection system, An escalator control device that controls the inverter device to decelerate and stop according to a deceleration smaller than the deceleration by the brake set in the acceleration / deceleration setting means when an abnormality is detected. In the escalator control device according to claim 1 or 2,
Further provided is a display means for displaying the operating state of the escalator,
When the load current detected by the current detection unit exceeds a predetermined set value during steady operation, the inverter control unit displays on the display unit that the acceleration operation is not performed despite the acceleration command. An escalator control device. In the escalator control device according to claim 1,
Further providing voice guidance means for guiding the operating state of the escalator;
The inverter control means outputs an audio guidance signal for accelerating the escalator from the audio guidance means immediately before acceleration operation when accelerating. In the escalator control device according to claim 2,
When the speed difference between the speed command associated with the acceleration command and the detected speed detected by the speed detection means exceeds a predetermined speed difference, the acceleration is interrupted and the speed command is decelerated below the original speed. Escalator control device. In the escalator control device according to any one of claims 1 to 3,
An escalator control device characterized by changing acceleration again while maintaining the acceleration command when the load current detected by the current detection means exceeds a predetermined value during acceleration accompanying the acceleration command.

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