JP2015054779A - Group management system for elevator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To save power as a whole system by optimizing a load amount of a counterweight of each car by taking an in-car average load for each car during a time zone of a divided operation into account.SOLUTION: A group management control device 30 includes an operation control unit 31, a proper weight determination unit 37 and a weight control unit 33. The operation control unit 31 divides an operation range of each car into at least two zones during a specified time zone for an operation. The proper weight determination unit 37 acquires a load amount of a counterweight in which power consumption becomes minimum for each zone as the proper weight for each zone, before performing a divided operation of each car. The weight control unit 33 changes the load amount by moving the counterweight of each car to a predetermined position based on the proper weight for each zone.

Description

  Embodiments described herein relate generally to an elevator group management system capable of changing a load weight of a counterweight.

  In a traction type elevator, a car is suspended from one end of a main rope wound around a sheave of a hoist, and a counterweight is suspended from the other end. When the sheave is rotated by driving the hoist, the car and the counterweight are moved up and down in opposite directions through the main rope.

  Normally, in such a traction type elevator, the weight of the counterweight is determined to be balanced at 50% of the rated load of the car. This state is called an overbalance rate (hereinafter referred to as OB rate) 50%. The OB rate refers to the loading rate of the car that balances the mass of the counterweight.

  In a state where the counterweight and the car are balanced at an OB rate of 50%, no load is applied to the hoisting machine, so that the car can be operated with the least power. However, the loading capacity of the car is not always constant and varies depending on the number of passengers. When the balance between the counterweight and the car is lost, for example, when the car is driven in the upward direction while the car is heavier than the counterweight, electric power is required. The same applies to driving the car in the downward direction with the car lighter than the counterweight, and requires electric power. In this way, the operation that requires electric power is called “power running operation”.

  On the other hand, when the car is driven in the downward direction in a state where the car is heavier than the counterweight, electric power is not required because the weight of the car can be used. The same applies to driving the car in the upward direction with the car lighter than the counterweight, and no power is required. In this way, the operation that does not require electric power is called “regenerative operation”. Note that the electric power generated in the regenerative operation is both consumed by a resistor or the like and returned to the power supply side (power consumption becomes negative).

  Here, with the recent demand for power saving, an elevator capable of changing the load amount of the counterweight has been proposed. Such an elevator is called a “flexible counterweight type elevator (FWC type elevator)”. In this FWC type elevator, power saving can be achieved by appropriately changing the loading amount of the counterweight in accordance with the loading load of the car.

  As a method of changing the load amount of the counterweight, for example, there is a method of providing a liquid tank in the counterweight and injecting or discharging the liquid into the liquid tank. Further, there is a method of attaching an additional weight to the counterweight in a detachable manner.

JP 2008-162882 A JP 2009-215049 A JP 2012-56692 A Japanese Patent No. 484951

  Here, in a group management system having a plurality of FWC type elevators, the power consumption of the entire system is reduced by adjusting the load weight of the counterweight of each elevator (referred to as a “unit”) to the same weight.

  However, for example, during the morning work hours, the operating range of each unit may be divided into low-rise zones. In such a split operation, the average car load is different in the low-rise zone and the high-rise zone even though the load in the standard floor car is the same. For this reason, the ideal load capacity does not match in each unit, and power consumption cannot be reduced.

  The problem to be solved by the present invention is to provide an elevator group management system capable of optimizing the load capacity of the counterweight of each unit in the time zone of divided operation and saving power of the entire system. .

  The elevator group management system according to the present embodiment includes a plurality of units, and the elevator group management system is provided with a mechanism capable of changing the loading amount of the counterweight. The operation control means for dividing the operation range of each unit into at least two zones, and the operation control means to reduce the power consumption for each zone before dividing each unit by the operation control unit. Based on the appropriate weight determining means for determining the loading amount of the counter weight as the appropriate weight for each zone and the appropriate weight for each zone obtained by the appropriate weight determining means, the counter weight of each unit is moved to a predetermined position. Weight control means for changing the load capacity.

FIG. 1 is a diagram illustrating an overall configuration of an elevator according to an embodiment. FIG. 2 is a block diagram showing the configuration of the elevator group management system in the embodiment. FIG. 3 is a flowchart showing an appropriate weight determination process of the group management control device in the embodiment. FIG. 4 is a flowchart showing an operation process of the group management control device in the embodiment. FIG. 5 is a view showing a change in the car load of each floor in the low-rise zone in the same embodiment. FIG. 6 is a diagram showing a change in the car load on each floor in the high-rise zone in the same embodiment. FIG. 7 is a diagram for explaining how to obtain the appropriate weight for each zone in the embodiment.

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

  FIG. 1 is a diagram illustrating an overall configuration of an elevator according to an embodiment, in which an elevator configuration including a flexible counterweight (FWC) is schematically illustrated.

  An elevator car 12 and a counterweight (suspending weight) 13 are provided in the hoistway 11 and are supported by guide rails (not shown) so as to be able to move up and down. The car 12 and the counterweight 13 are connected by a rope 14 and are moved up and down in opposite directions by driving the hoisting machine 15.

  In the example of FIG. 1, the car 12 and the counterweight 13 are supported in a 2: 1 roping format, and one end of the rope 14 is fixed to the upper part of the hoistway 11 by a hitch 16. The other end side of the rope 14 is wound around the hoisting machine 15 via a sheave 17 provided at the bottom of the car 12. The other end of the rope 14 wound around the hoisting machine 15 is fixed to the upper part of the hoistway 11 by a hitch 19 via a sheave 18 provided on the counterweight 13.

  Here, the counterweight 13 is provided with a mechanism capable of changing the loading amount. Specifically, a subweight mounting portion 20 is provided on the counterweight 13, and at least one or more subweights 22 supplied from the subweight supply portion 21 are stacked on the subweight mounting portion 20. . Further, the subweight supply unit 21 also has a function of collecting the subweight 22 stacked on the subweight mounting unit 20.

  The subweight supply unit 21 is installed near the top of the hoistway 11. When changing the loading amount of the counterweight 13, the car 12 is lowered and the counterweight 13 is moved to the installation position of the subweight supply unit 21. In this state, the driving mechanism of the subweight supply unit 21 (not shown) is operated, and the subweights 22 are supplied to the subweight mounting unit 20 one by one or the subweights stacked on the subweight mounting unit 20 22 is recovered.

  The specific configuration of each mechanism such as the subweight mounting unit 20 and the subweight supply unit 21 is not directly related to the present invention, and thus detailed description thereof will be omitted here.

  FIG. 2 is a block diagram showing the configuration of the elevator group management system in the embodiment.

  There are several elevators in the building. These elevators are provided with a flexible counterweight (FWC) as shown in FIG.

  Hereinafter, each elevator is referred to as “unit”. In the example of FIG. 1, a configuration in which four units A, B, C, and D are group-managed is shown, but the group management target is not limited to four, and any number may be used.

  The group management control device 30 controls the operation of each car in response to a hall call or a car call. “Place call” is a call signal registered by operating a hall call button installed at a hall on each floor. This hall call includes information on the registered floor and the destination direction (up / down). The “car call” is a call signal registered by operating a destination floor button provided in the car. This car call includes information on the destination floor.

  The group management control device 30 includes, as a functional configuration for realizing the present invention, an operation control unit 31, a car load totaling unit 32, a weight control unit 33, a stop pattern storage unit 34, a car load storage unit 35, An appropriate weight storage unit 36, an appropriate weight determination unit 37, a power consumption table 38, and a zone switching control unit 39 are provided.

  In addition, here, for convenience, the operation control unit 31, the car load totaling unit 32, the weight control unit 33, the stop pattern storage unit 34, the car load storage unit 35, the appropriate weight storage unit 36, the appropriate weight determination unit 37, and the power consumption The table 38 and the zone switching control unit 39 are all described in the group management control device 30. However, the table 38 and the zone switching control unit 39 are not necessarily arranged in the same device, and may be arranged in different devices.

  When the hall call is registered, the operation control unit 31 performs an allocation control to select an optimum car from each car and respond to the hall call registration floor. In addition, the operation control unit 31 performs a zone division operation in which the operation range of each unit is divided into at least two zones during a specific time period. The zone switching control unit 39 selects the stop pattern of each car at the time of zone division operation from the stop pattern storage unit 34 according to the time zone or the like.

  The specific time zone includes a crowded time zone (for example, a morning attendance time zone) in which each unit is almost full and is frequently driven in one direction from the reference floor.

  The in-car load totaling unit 32 totals the in-car loads of each unit for each floor. The load in the car of each car is measured by load meters 42a to 42d installed in the car 41a to 41d of each car described later.

  The weight control unit 33 controls the load amount of the counterweight of each car via the car control devices 40a to 40d of each car. Specifically, the loading amount is changed by increasing / decreasing the subweight 22 by moving the counterweight 13 shown in FIG. 1 to the installation position of the subweight supply unit 21 for each unit. Further, the weight control unit 33 moves the counterweight of each unit to a predetermined position based on the appropriate weight for each zone obtained by the appropriate weight storage unit 36, which will be described later, and changes the loading amount.

  The stop pattern storage unit 34 stores the stop pattern of each car. In this case, each unit stops on the same floor during normal operation, but when switching to zone division operation, the stop pattern of each unit differs for each zone.

  The stop pattern storage unit 34 is not necessarily set to stop all the floors that can actually stop as the stop pattern of each car. That is, as an example of zone division operation, if it is divided into two ways, 1st floor to 8th floor (low floor) and 1st floor, 9th floor to 14th floor (high floor), it is actually upward direction from 2nd floor to 8th floor There is a case where a high-rise car responds to a hall call, or a car call is permitted on all floors after a high-rise car responds on a floor other than the first floor. In other words, control may be performed so that a user who gets on the middle floor can go to any floor. In the present embodiment, it is assumed that a typical stop pattern is set in which a large number of users are placed on the reference floor and lowered on the original service floor without considering such special movement. .

  The in-car load storage unit 35 stores the in-car load of each of the cars counted by the in-car load totaling unit 32. The car load information of each car stored in the car load storage unit 35 is given to the appropriate weight determination unit 37 together with the stop pattern information of each car stored in the stop pattern storage unit 34.

  The appropriate weight storage unit 36 stores the appropriate weight determined by the appropriate weight determination unit 37. The proper weight stored in the proper weight storage unit 36 is given to the weight control unit 33, and is referred to when changing the loading amount of the counter weight of each unit during the zone division operation.

  The appropriate weight determining unit 37 obtains the counter weight loading amount that minimizes the power consumption for each zone as the appropriate weight for each zone before each unit is divided and operated.

  Specifically, the appropriate weight determination unit 37 includes a condition setting unit 37a and a power consumption calculation unit 37b. The condition setting unit 37a sets the stop pattern of each car for each zone and the average car load on each floor in a specific time zone as operating conditions. The power consumption calculation unit 37b calculates the power consumption when the counter weight load amount of each unit is operated while sequentially changing a predetermined range in accordance with the operation conditions set by the condition setting unit 37a. The appropriate weight determining unit 37 determines the counterweight loading amount with the smallest power consumption calculated by the power consumption calculating unit 37b as the appropriate weight for each zone, and stores it in the appropriate weight storage unit.

  In the power consumption table 38, information on the power consumed when each unit is operated is stored in advance. Specifically, an approximate value of power consumed at that time is stored for each combination of the car load, the counterweight load, the operation distance, and the operation direction. In the power consumption table 38, 0 is set when the power generated in the regenerative operation is consumed by a resistor or the like, and a negative value is set when returning to the power source side.

  The car control devices 40 a, 40 b, 40 c, 40 d of each unit control the operation of each unit according to instructions from the group management control unit 30. In FIG. 2, the configuration of each unit is shown in a simplified manner, but actually, it has the configuration as shown in FIG. 1, and the load weight of the counterweight can be varied.

Next, the operation of this system will be described.
Here, (a) appropriate weight determination processing and (b) operation processing will be described separately. The processes shown in the following flowcharts are executed when the group management control device 30 that is a computer reads a predetermined program.

(A) Appropriate Weight Determination Process FIG. 3 is a flowchart showing the appropriate weight determination process of the group management control device 30. The appropriate weight determination process is executed periodically, for example, every day at dawn, and the optimum counterweight loading amount for the day is determined for each zone.

  First, the stop weight pattern for each zone and the average car load on each floor for each car in the zone division time zone are set in the appropriate weight determination unit 37 of the group management control device 30 (steps S11 and S12). The stop patterns for each zone are stored in the stop pattern storage unit 34, and the average car load of each car is stored in the car load storage unit 35. The average car load on each floor of each car is obtained from the aggregate value of the car loads on each floor of each car stored in the car load storage unit 35.

  Assuming that the buildings on the 1st to 14th floors are divided into a low-rise zone of “1st to 8th floor” and a high-rise zone of “1st, 9th to 14th floor” in the morning work hours. (See FIGS. 5 and 6).

  Cars A and B (cars 14a and 14b) operate in the low-rise zone, and cars C and D (cars 14c and 14d) work in the high-rise zone. The first floor is the reference floor, and each unit provides operation services.

  In such a case, the 1st to 8th floors are set as the stop patterns of the low-rise zone, and the average car load of the No. A and No. B cars for these floors is set. In addition, the first floor, the 9th floor to the 14th floor are set as the stop patterns in the high-rise zone, and the average car load of the No. C and No. D machines for these floors is set.

When the proper weight determination unit 37 is operated with the stop pattern of each unit and the average car load on each floor as operating conditions, and the counter weight loading amount of each unit is changed while sequentially changing a predetermined range according to the operating conditions. The power consumption of is calculated. (Step S13)
Specifically, for example, when there are five variable ranges of the counterweight loading amount, G1 to G5, first, each unit is changed according to the stop pattern for each zone while changing the loading amount in order from the minimum value G1. Obtain the amount of power consumption when operating once. In addition, each unit is not actually moved, but each unit is virtually moved by a simulation in a computer, and the power consumption at that time is obtained.

  In this case, since the morning work hours are assumed, as shown in FIG. 5, the units belonging to the low-rise zone (Units A and B) depart from the basement on the first floor, which is almost full. Then, passengers get off a little at each floor and drive up to the 8th floor. After climbing up to the 8th floor, it will drive down to the 1st floor in a state close to unmanned. In the example of FIG. 5, the load in the car when the right side of the center of the horizontal axis is operated as an uphill, and the car load when the left side is operated as a downside (both are relative amounts to the rating) are shown. The same applies to the example of FIG.

  On the other hand, as shown in FIG. 6, the units belonging to the high-rise zone (units C and D) depart from the first floor, which is the standard floor, in a state that is almost full, and go straight to the 9th floor, then a little at each floor Get off the passenger and drive up to the 14th floor. After climbing up to the 14th floor, the vehicle will continue to drive down to the 1st floor in a state close to unattended.

  Here, in the power consumption table 38, information related to power consumption (approximate value of power consumed at that time for each combination of car load, counterweight load, driving distance, and driving direction) is stored in advance. . The appropriate weight determination unit 37 obtains the amount of power consumed by the operation in the low zone and the high zone as described above with reference to the power consumption table 38 (step S13). Instead of using the power consumption table 38, the power consumption amount may be obtained according to a predetermined calculation formula each time.

  In this way, the appropriate weight determination unit 37 obtains the power consumption amount while changing the loading amount of the counter weight in order from G1. When the amount of power consumption is obtained by changing the loading amount to the maximum value G5, the appropriate weight determination unit 37 acquires the loading amount with the smallest amount of power consumption among G1 to G5 as the appropriate weight in the zone, and obtains the appropriate weight. It memorize | stores in the memory | storage part 36 (step S14). If there is another zone (Yes in step S15), the appropriate weight determination unit 37 calculates an appropriate weight for the zone in the same manner as described above.

  That is, as shown in FIG. 7, in the low-rise zone, the power consumption of one lap when the A-unit and the B-unit are stopped on the first floor of the reference floor and the second to eighth floors is obtained. In the high-rise zone, the power consumption of one lap when the C and D cars are stopped on the first floor of the standard floor and the 9th to 14th floors is obtained. The power consumption amount is repeatedly obtained while changing the counterweight loading amount in each zone, and the loading amount with the smallest power consumption amount is set as an appropriate weight in the zone.

  Here, for example, in the low-rise zone, if the load amount that minimizes the power consumption is G2, G2 is determined as an appropriate weight for the low-rise zone. For example, in the high-rise zone, if the load amount that minimizes the power consumption is G4, G4 is determined as an appropriate weight for the high-rise zone.

  Note that the notation such as “80%” in the figure is an expected value of the load in the car when departing from each floor (a value calculated from past operation results). In addition, the arrow shown on the car indicates the direction in which the car will move, and the staircase graph indicates the car position that changes with time.

  In general, in the low-rise zone, the car starts to get off as soon as it leaves the standard floor, so the average car load is small and the load capacity as the appropriate weight is small. On the other hand, in the high and low-rise zones, the car does not start getting off immediately after leaving the standard floor, so the average car load is heavy and the load capacity as a proper weight is large. In other words, even if the demand on each floor is unbalanced between the high-rise zone and the low-rise zone, it is possible to save power by optimizing the loading amount of the counterweight for each zone.

  In FIG. 3, the power consumption amount is obtained for all the loading amounts (G1 to G5), and an appropriate weight is selected from them. However, since the value of the appropriate weight does not change greatly every day, for example, the previous day The power consumption amount may be obtained only for the front and rear load amounts based on the load amount used as the proper weight, and the proper weight may be selected.

(B) Driving Process FIG. 4 is a flowchart showing the driving process of the group management control device 30. This operation process is divided into normal operation and zone division operation.

  In normal operation, the operation control unit 31 of the group management control device 30 performs allocation control for each unit with respect to the hall call registered on each floor, and makes the optimal unit in each unit respond. The driving service is provided for each floor (step S21). At this time, the count weight loading amount of each unit is adjusted to the same value.

  Here, when it is a predetermined time before the zone division time zone (for example, 10 minutes before) (Yes in Step S22), the weight control unit 33 of the group management control device 30 performs the operation for each zone stored in the appropriate weight storage unit 36. Based on the appropriate weights, the count weight loading amount of each unit is optimized for each zone (step S23).

  In other words, when driving in the morning work hours divided into a low-rise zone and a high-rise zone, the count weight loading capacity of Units A and B belonging to the low-rise zone is changed to an appropriate weight set for the low-rise zone. . In addition, the loading amount of the count weights of Unit D and Unit E belonging to the high-rise zone is changed to an appropriate weight set for the high-low zone.

  As described with reference to FIG. 1, the count weight loading amount is changed by moving the counterweight 13 to the installation position of the subweight supply unit 21 for each unit and increasing or decreasing the subweight 22.

  The reason why the change is made a predetermined time before the zone division time zone is that it is late to change after entering the zone division time zone. Therefore, for example, when 10 minutes ago, it is assumed that the count weight loading amount is changed in order from the unit waiting for the call.

  When the zone division time zone is reached (Yes in step S24), the operation control unit 31 switches to the zone division operation, and operates each unit for each zone (step S25). At this time, the operation control unit 31 records the load in the car and the moving distance of each car as performance data, which is used as a reference when determining an appropriate weight on the next day (step S26).

  When the zone division time period is finished (Yes in step S27), the operation is switched to normal operation (step S28), and the count weight loading amount of each unit is returned to normal operation (step S29).

  As described above, according to the present embodiment, when performing the zone division operation in a predetermined time zone, it is possible to respond to the demand of each floor of each zone by optimizing the loading amount of the count weight of each unit for each zone. Power can be saved by operating efficiently. In particular, it is effective when there is a large imbalance in demand between floors between zones, such as in the morning work hours, and the power consumption of the entire system can be reduced.

  In the above embodiment, the case where the operation is divided into two of the low zone and the high zone has been described as an example, but the same applies to the case where the operation is divided into two or more zones. Thus, by optimizing the load capacity of the count weight of each unit, it is possible to save power in the entire system.

  Also, the time zone for performing the zone division operation is not limited to the morning work time zone. For example, if the demand on each floor changes greatly, such as work hours and lunch hours, passengers can be efficiently transported by zone-dividing operation. By doing so, it is possible to reduce the power consumption of the entire system.

  However, in the lunch time zone, the demand is different at the start and end of the time zone. For example, if the cafeteria is on the upper floor, it will be up-peak crowded at the start and down-peak crowded at the end. In such a case, the whole lunch time period is considered as one, and an average desired load amount for both up-peak congestion and down-peak congestion is determined as an appropriate weight. This is because the interval between the start and end of the lunch time period is short, and it is difficult to change the load amount appropriately during that time.

  Also, during down-peak hours such as work hours, the target floor of each unit is often the standard floor, so there will be no inconvenience to passengers even if the zone width is changed. In the peak time zone, the zone width may be changed as appropriate to save power.

  According to at least one of the embodiments described above, it is possible to reduce the power consumption of the entire system by optimizing the load weight of the counterweight of each unit in consideration of the average load in the car of each unit in the time zone of the divided operation. It is possible to provide an elevator group management system that can perform the above-described operation.

  In addition, although some embodiment of this invention was described, these embodiment is shown as an example and is not intending limiting the range of invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  DESCRIPTION OF SYMBOLS 11 ... Hoistway, 12 ... Ride car, 13 ... Counterweight, 14 ... Rope, 15 ... Hoisting machine, 16 ... Hitch, 17 ... Sheave, 18 ... Sheave, 19 ... Hitch, 20 ... Subweight mounting part, 21 ... Sub weight supply unit, 22 ... sub weight, 30 ... group management control device, 31 ... operation control unit, 32 ... car load counting unit, 33 ... weight control unit, 34 ... stop pattern storage unit, 35 ... car load storage 36, proper weight storage unit, 37 ... proper weight determination unit, 37a ... condition setting unit, 37b ... power consumption calculation unit 37b, 40a, 40b, 40c, 40d ... car control device, 41a, 41b, 41c, 41d ... Car, 42a, 42b, 42c, 42d ... load cell.

Here, with the recent demand for power saving, an elevator capable of changing the load amount of the counterweight has been proposed. Such an elevator is called a “flexible counterweight type elevator ( FCW type elevator)”. In this FCW type elevator, power saving can be achieved by appropriately changing the loading amount of the counterweight according to the loading load of the car.

Here, in a group management system having a plurality of FCW type elevators, the power consumption of the entire system is reduced by adjusting the loading amount of the counterweight of each elevator (referred to as a “unit”) to the same weight.

The elevator group management system according to the present embodiment includes a plurality of units, and the elevator group management system is provided with a mechanism capable of changing the loading amount of the counterweight. The operation control means for dividing the operation range of each unit into at least two zones, and the operation control means to reduce the power consumption for each zone before dividing each unit by the operation control unit. Based on the appropriate weight determining means for determining the loading amount of the counter weight as the appropriate weight for each zone and the appropriate weight for each zone obtained by the appropriate weight determining means, the counter weight of each unit is moved to a predetermined position. ; and a wait control means for changing the payload Te, said proper weight determining means, each unit by zone Condition setting means for setting the stop pattern and the average car load on each floor in the specific time zone as operating conditions, and the load capacity of the counterweight of each unit according to the operating conditions set by the condition setting means Power consumption calculation means for calculating the power consumption when the vehicle is operated while sequentially changing the predetermined range, and the loading amount of the counterweight that minimizes the power consumption calculated by the power consumption calculation means Is determined as an appropriate weight for each zone .
Further, the elevator group management system according to the present embodiment has a plurality of units, and these units have a mechanism capable of changing the load weight of the counterweight. The operation control means for dividing the operation range of each unit into at least two zones in the time zone, and the least power consumption for each zone before dividing each unit by the operation control means. The appropriate weight determining means for obtaining the loading amount of the counter weight as the appropriate weight for each zone, and the counter weight of each of the above units at a predetermined position based on the appropriate weight for each zone obtained by the appropriate weight determining means. Weight control means for changing the load amount by moving the weight control means, and the weight control means The load weight of the counter weight of each unit is controlled to the same weight according to the traffic situation, and the load amount of the counter weight of each unit is appropriate for each zone during the specific time period. Control individually based on weight.

FIG. 1 is a diagram showing an overall configuration of an elevator according to an embodiment, and here, the configuration of an elevator including a flexible counterweight ( FCW ) is schematically shown.

There are several elevators in the building. These elevators are provided with a flexible counterweight ( FCW ) as shown in FIG.

Claims (5)

In the elevator group management system, which has multiple units, and these units are provided with a mechanism that can change the load capacity of the counterweight.
Operation control means for dividing and operating the operation range of each unit in at least two zones in a specific time zone;
The proper weight determining means for obtaining the loading amount of the counterweight as the appropriate weight for each zone, which consumes the least amount of power for each of the zones before dividing each unit by the operation control means,
An elevator comprising: weight control means for moving the counterweight of each unit to a predetermined position based on the appropriate weight for each zone obtained by the appropriate weight determining means, and changing the load amount. Group management system. The appropriate weight determining means is:
Condition setting means for setting the stop pattern of each unit and the average car load on each floor in the specific time zone as operating conditions for each zone,
In accordance with the operating conditions set by the condition setting means, the power consumption calculating means for calculating the power consumption when the counter weight of each unit is operated while sequentially changing the load range of the counter weight, and
2. The elevator group management system according to claim 1, wherein the loading amount of the counterweight that minimizes the power consumption calculated by the power consumption calculating means is determined as an appropriate weight for each zone. The weight control means is
Control the load weight of the counterweight of each unit at the same weight according to traffic conditions at times other than the specific time period,
2. The elevator group management system according to claim 1, wherein the loading amount of the counterweight of each unit is individually controlled based on the appropriate weight for each zone during the specific time period.   2. The elevator group management system according to claim 1, wherein the specific time zone includes a crowded time zone in which each unit is operated in one direction from the reference floor in a state where each of the units is almost full. The appropriate weight determining means is:
If the demand is different in the first half and the second half of the specific time zone and there is no quiet situation on the way, the loading capacity of the counterweight that minimizes the power consumption over the period of the time zone is set appropriately for each zone. The elevator group management system according to claim 1, wherein the system is determined as a weight.

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