JPH0226287A - Sequential start command apparatus for motor - Google Patents

Abstract

PURPOSE:To make setting of a step completion time unnecessary by setting the starting order and start completion time of a motor and by determining the longest start completion period of time among such periods of motors in the same starting step as the start completion time in said starting step. CONSTITUTION:The starting order and starting time of motors 151-15n are registered in the starting condition register part 3 by a command from a starting condition register command apparatus 2. After completion of register, a motor of starting order 1 is selected by a starting motor selector part 7 on the basis of data of said starting condition register part 3 according to a start command 11. Then, selected motors 151-15n are started by a starting order controller 8. A step completion time selector part 9 causes a motor of starting order 2 to advance in steps, when the longest starting period of time among starting periods of said selected motors has elapsed.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Field of Application) The present invention is applicable to a motor sequential start command device for a plant or the like that requires starting a plurality of motors in a predetermined order. .

(Prior Art) When starting a plurality of electric motors in sequence, a starting order is determined in advance, and a sequential starting circuit is constructed so that the motors are operated in the starting order.

(Problem to be Solved by the Invention) In the conventional technology, a sequential starting circuit was constructed so that the motors were operated in a predetermined starting order, so it was difficult to change the starting order when remodeling or adding to a plant, etc. was becoming complicated.

In addition, since the startup time differs depending on the load of the motor, the step completion time setting in the stage (step) of starting multiple motors at the same time is based on the time required for the motor with the longest startup completion time to complete startup in that step. The step completion time was determined for each step and fixed as the step completion time, so if the combination of motors that are to be started at the same time is changed, the step completion time must be set again, otherwise the motors will not have completed starting. There was a risk that the next step's electric motor would start even though it was not there.

In order to solve the problems of the prior art, the present invention includes a starting condition registration command device, a starting condition registration section, a starting motor selection section, a step completion time selection section, a starting order control section, and a starting command section. It is an object of the present invention to provide a motor order start command device that can operate motors in an arbitrary start order and eliminates the need to set step completion times.

[Structure of the Invention] (Means for Solving the Problems) The present invention includes a starting condition registration command device for registering the starting order and starting time of a plurality of electric motors, and a starting condition registration command unit that sends commands to each electric motor. a starting condition registration section consisting of a motor name registration section, a starting order registration section, and a starting time registration section that are registered for each motor; a starting motor selection section that selects a motor to be started in the starting step from the starting condition registration section; a step completion time selection section that selects a step completion time from the startup time of the motor selected by the starting motor selection section; a starting order control section that controls the starting timing of the motor; and a motor starting device based on a command from the starting order control section. This is a motor sequential start command device that includes a start command unit that outputs a start command to the motor.

(Function) In the device configured in this way, the starting order is set to 1, 2, 3, . Startup completion time' l r t2 r '3 +...tn
, and in accordance with the starting order, a starting command is output from a starting command unit to a motor starting device to start the electric motor. Here, the motor with starting order 1 is Ml.

M2. If there are three M3s, the pre-registered startup time of each motor is 71 = 5 seconds, t 2 = 3 seconds.

Assuming that r3=10 seconds, the step completion time of starting order 1 is as follows: motors Ml, M2 . The value may be set to the same value as the longest startup time among M3.

Startup completion time 'I, '2+! 3, t 3
= 100 seconds is the second step completion time. Therefore.

From the start command unit, electric motors Ml, M2 . After issuing a start command to the motor starting device that starts M3 and receiving a starting start signal from the motor starting device, it is determined that all the motors in starting order 1 have been started in 10 seconds, and the motors in starting order 2 are started. (Embodiment) An embodiment of the present invention will be described below. FIG. 1 shows an example of the configuration. The starting order and starting time of the electric motors 151 to 157L are registered by the starting order and starting time in the motor name registration section 4 of the starting condition registration section 3 according to a command from the starting condition registration command device 2. It is registered in the registration section 5 and the startup time registration section 6. After the registration is completed, in response to the start command 11, the starting motor selection unit 7 selects the motor with starting order 1 from the starting condition registration unit 3, and starts the motor using the starting order control unit 8 in order to start the selected motor. A command is issued to the command unit 12, and the start command unit 12 starts the electric motor,
Startup commands 131 to 13rL to wave devices 141 to 147L
is output, and the electric motors 151 to 15yt are started. In parallel with the output of the startup commands 131 to 137L, the step completion time selection section 9 selects the step startup completion time. Next, it is determined whether all the electric motors 151 to 157L have been started based on the activation start signals 161 to 167L output from the motor starting devices 141 to 14n, and if it is determined that all the motors have not been activated, , it is determined that a malfunction has occurred, and the alarm device 10 issues an alarm, and at the same time, the process to step 2 of the startup order is stopped.

If all the units have been activated, it is determined whether the step activation completion time selected by the step completion time selection unit 9 has elapsed, and if the step activation completion time has come, the step proceeds to activation order 2. The operations in startup orders 2 to 7L are the same as in startup order 1. FIG. 2 is a flowchart showing the processing contents performed by the motor sequential start command device in the above operation, in which 31 is a motor selection processing section, 32 is a start command control processing section, 33 is a step completion time processing section, 34
Reference numeral 238 indicates a startup start completion determination section, 35 an alarm processing section, 36 a startup completion time determination section, and 37 an end determination section 238 a startup order processing section.

[Effects of the Invention] According to the present invention, it is possible to operate the electric motor in any starting order, and it is not necessary to set the step completion time.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram of a motor sequential start command device showing an embodiment of the present invention, and Fig. 2 is an explanatory diagram of processing contents. 3... Start condition registration section 4... ...Motor name registration section 5...
...Start-up order registration section 6...Start-up time registration section 7...Start-up motor selection section 8...
. . . Startup order control section 9 . . . Step completion time selection section 12 . . .
・・・・・・Startup Command Department Agent Patent Attorney Nori Chika Yudo Yamashita

Claims (1)

[Claims] A starting condition registration command section that registers the starting order and starting time of multiple electric motors, a motor name registration section that registers commands from the starting condition registration command section for each motor, a starting order registration section, and starting time. a starting motor selection section that selects a motor to be started in the starting step from the starting condition registration section; and a step completion time based on the starting time of the motor selected by the starting motor selection section. a step completion time selection section that selects a step completion time, a start order control section that controls the start timing of the electric motor, and a start command section that outputs a start command to a motor starting device based on a command from the start order control section. A motor sequence start command device.