JPS60122403A - Controller of number of operation - Google Patents

Abstract

PURPOSE:To relieve the load of operation by designating sequentially the sequence of operation of each motor and designating it by a sequence designation section so as to allow a base selection section to drive a base motor according thereto and allow a number of set control section to drive motors other than the base motor. CONSTITUTION:Motors M1-M3 are connected to pumps P1-P3, a power PS is supplied directly or through an inverter 1 by electromagnetic switches MS1- MS3 and the operation of each motor is controlled by electromagnetic switches MS3-MS6. The sequence of operation of the motors M1-M3 is changed sequentially in response to a start signal ST and its sequence is designated by a sequence designation section 2, which is provided to the number of operation controller. A designation signal from the designation section 2 is fed to a base selection section 3 and a number of operation control section 4, the base selection section 3 operates the switches MS1-MS3 in response to status signals S1- S3 so as to drive the base motor. Moreover, the control section 4 activates the switches MS4-MS6 in response to the designation signal so as to the motors other than the base motor thereby relieving the load of operation.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention provides an operation in which one of a plurality of motors is used as a base motor for variable speed operation according to the load, and other motors are operated sequentially according to the load. This invention relates to improvement of a number control device.

[Prior art]

When operating water pumps for air conditioners, etc.
Multiple pumps and corresponding drive motors are provided, one of the motors is used as a base motor that performs variable speed operation according to increases and decreases in the air conditioning load, and the pump connected to this motor is used as the base pump. , the other motors are sequentially operated at a constant speed as the air conditioning load increases, thereby controlling the full capacity of the pump being operated.

However, the base pump is generally specified and is constantly operated, resulting in the disadvantage that the pump itself or the motor wears out sooner than other pumps.

As a countermeasure, you can add a speed control device such as a motor inverter to all pumps and sequentially change the pump used as the base pump, or artificially switch the connection between each motor and the speed control device, and Conventionally, means have been used to manually sequentially change the pump to be used.

However, the former method has the disadvantage of increasing the number of speed control devices and making it expensive, while the latter method
It is troublesome to operate, and there are drawbacks such as incorrect switching order and uneven operating times when used as a base pump.

[Summary of the invention]

The present invention has the purpose of fundamentally solving the drawbacks of the conventional art, and has a ranking designation section that sequentially changes and designates the operating order of each motor, and a base selection section that selects a base motor accordingly. In addition, the present invention provides an extremely effective device for controlling the number of operating units in which motors other than the selected base motor are sequentially operated by a number controlling unit in accordance with specifications and loads from a ranking specifying unit. .

〔Example〕

Hereinafter, the present invention will be explained in detail with reference to figures showing examples.

Figure 1 is a block diagram of the entire configuration, and shows pumps P to P8.
and motors M0 to M8 connected to each other are provided, and the supply of power PS to these motors is via electromagnetic switches MS□ to M
f3B, either directly or via the inverter 1, and each individual operation is controlled by an electromagnetic switch M.
It is controlled by S4 to MS6.

In addition, each motor M1 to M
A ranking designating section 2 is provided which sequentially changes and designates the driving order of the vehicles, and a future designation signal is given to a base selecting section 3 and a number control section 4, and the base selecting section 3
In order to drive any of the electromagnetic switches ■□ to Ms8 according to the designated signal, for example, when the electromagnetic switch □ is driven, the motor M1 is connected to the inverter 1, which is a load that indicates an increase or decrease in the air conditioning load, etc. Electric power corresponding to the signal Ls is given to the motor M1, resulting in the motor M0 being selected as the base motor.

On the other hand, the number control unit 4 drives the electromagnetic switch in response to the designation signal from the order designation unit 2, and also drives the electromagnetic switch in response to the load signal L8.
When the load amount exceeds the maximum capacity of the pump P1, for example, the electromagnetic switch MS5. MS6 is sequentially driven, motors M2 . M
8 in sequence.

The ranking designation unit 2 is provided with failure detection signals E1 to E8 for each of the motors M1 to M8 and pumps P0 to P8, and those in which these occur are excluded from designation of the operating ranking. There is.

In addition, status signals 80 to S8 indicating that the motors M1 to M8 are in operation are sent to the OR gate 5 in the base selection unit 3.
If any of these occur, the current state is maintained without changing the drive status for the electromagnetic switches ■□~MSB. This prevents such problems from occurring.

FIG. 2 is a diagram showing the control status of the number n of operating vehicles in response to a change in the operating order. In this example, when the operating order is the first mode, the motor M1 becomes the base motor as shown in (A), Variable speed operation is repeated as the load ranges from 0 to 100 inches, but motors M, , M8 are sequentially operated at constant speed as the load increases, and the number of motors in operation decreases in proportion to the load. n increases.

In the case of the second mode, as shown in (B), motor M2 becomes the base motor, and as the load increases, motor M8. Constant speed operation is performed sequentially depending on the rank of the M engineer.
In the third mode (as shown in 0), motor M8 is selected as the base motor, and constant speed operation is performed sequentially according to the order of motor M1M.

Note that when the load decreases, in any mode, the motor that was operated last stops first, followed by the motor that operated second.

Therefore, the base motor that continuously performs variable speed operation is sequentially changed, and the operating order of the motors that perform constant speed operation is also sequentially changed, and the average total operating time of each motor M1 to M8 and pump P1 to P is Both motors and pumps suffer premature wear and tear.

Furthermore, since the driving order is automatically changed, the operational burden is reduced and the total driving time is accurately averaged.

Each of the units 2 to 4 may be configured by a combination of various logic circuits, or may be controlled by a predetermined program using a processor, memory, or the like.

However, what is driven by the motors M0 to M8 is not limited to the pumps P1 to P8, but other speed controllers may be used instead of the inverter 10, and electromagnetic switches may also be used. However, instead of using ~MS6, other switching elements may be used.

Further, instead of the starting signal 870, a time signal from a clock device or the like may be used, and the present invention can be modified in various ways.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, the operating order of a plurality of motors is automatically changed,
The total operating time of each motor is accurately equalized, premature wear and tear does not occur in any of the motors, and the operational burden is reduced, resulting in significant effects in controlling the number of operating units for various applications.

[Brief explanation of the drawing]

The figures show embodiments of the present invention, with Figure 1 being a block diagram and Figure 2 being a block diagram.
The figure shows the control status of the number of operating vehicles. 1... Inverter, 2... Rank specification section, 3...
...Base selection section, 4...Number control section, Ls...
・・Load signal, M～M8・・・・Motor, 兇～兇
...Electromagnetic switch, Ps ...6 Power supply. Patent applicant: Yamatake Honeywell Co., Ltd. Agent: Masaki Yamakawa (?ji) 1 person)

Claims (1)

[Claims] In an operation number control device that has multiple motors, one of which is used as a base motor for variable speed operation according to the load, and the other motors are operated sequentially according to the load, the operation order of each motor is changed sequentially. a rank designation section that specifies the
a base selection section that selects the base motor from among the motors according to a designation from the ranking designation section; and a base selection section that sequentially operates motors other than the selected base motor according to the designation from the ranking designation section and the load. 1. A device for controlling the number of operating machines, characterized by comprising a number-of-machines control section.