JPS58116020A - Automatic power source selecting device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic power selection device for a motor-driven grain dryer or the like.

For example, in the case of a grain dryer driven by a motor,
The amount of electricity used varies depending on the location where the machine is installed.
You will be using either fltGfjlk$100V, single-phase 200V, or s@zoov.

In order to prevent the motor from burning out due to overload, the reference voltage etc. 4I:! It is necessary to adjust the adjustment by 1 m, but in the past, this adjustment was done manually, which not only makes the operation complicated, but if you forget to make this adjustment, the control device may be damaged or the motor may not operate properly. The problem was that it could not be guaranteed.

This invention was devised in view of the above, and its purpose is to automatically switch overload standard '1 voltage, which is the standard for determining overload operation according to the power source used. It is intended to provide a selective device.

In order to achieve the above object, the present invention includes a voltage detection device 8 for detecting the voltage of a power source connected to the motor 1, and a phase number detection device 5 for detecting the number of phases of the AC power source. The reference voltage setting device 7/ is provided with an overload reference voltage that is a reference for determining overload operation of the motor 1 and switches in response to the s#iIK of the power supply detected by the phase number detection device 5 and the phase number detection device 5. be.

The following is a detailed description using drawings showing one embodiment of this invention #4@
do.

In FIG. 1, 1 is a motor, and 8@power terminals a, S, TKJi! It is continued.

Reference numeral 8 denotes a voltage detection device, which detects the voltage of the power supply by a relay L1 connected between the power supplies S and T.

Ll-1a and Ll-2 are relay contacts of relay L1, respectively, which are conductive contacts when relay Ll is inactive, and relay L1
is equipped with conductive contacts B and t when activated.

The conduction contact of relay contact L1-1 is transformer T.

*a is connected to the 100V terminal of the transformer T'
The two GOV terminals KII are connected.

Reference numeral 5 denotes a phase number detection device, which detects the number of phases of the AC power source using a relay LxK connected to the threshold of the power source single R18.

The relay contacts of L and 1 are the relay contacts of L:, the conductive contact when relay L2 is inactive, and the conductive contact B when relay L2 is activated.
I am prepared.

7 is a reference voltage setting device that switches the overload reference voltage according to the type of power supply, and is equipped with a single-phase 10 (1) reference voltage vl, a single-phase 200V reference voltage v2, and an 8-phase 200V reference voltage v3. There is.

Then, the relay contact Ll-2 of the relay L1 marked m is connected to the single-phase 100V reference voltage vl, and the relay L2
The conduction contact A of the relay contact L2-1 of the relay L2-1 is connected to the single-phase 200V reference voltage V, and the relay L is connected to the reference voltage V of the single-phase 200V.

The relay contact L2-1 and the conduction contact B11 are connected to the reference voltage V 3 K% of phase 200V, respectively.

The relay L1 and relay L2 are both 200
It operates with a voltage of 5 to 20 (1 rated).

9 detects the electric current mv flowing to the motor 1 and outputs the electric current 611
The converter is a converter that converts into a voltage, and is composed of current detecting devices C and T that detect a power source, and a resistor R and a diode D that convert the current into a voltage.

11 is an output voltage detected by the converter 9;
This is a comparison device that compares the reference voltage set by the reference voltage setting device 7, and is composed of an operational amplifier 8.

Reference numeral 15 denotes a switch 1 that operates in conjunction with a relay MC that is activated by the excess IIL output detected by the comparator 11.

In the above configuration, if the input voltage is single-phase 100cm, each relay L1*Ll and relay contact l1t-ts'' as shown in the gt operating state in FIG.
t-2s L! -1 operates to the overload reference voltage 'V
Set to t. In other words, since the input voltage is 100V, relay L1 with a 200V rating does not operate, and relay contact L
l-1 conducts to the conductive contact and the transformer Tr's 100V
Power supply voltage is applied to the terminal. And relay contact Ll
-2 is electrically connected to the conductive contact, and the reference voltage setting device sets the excessive negative reference voltage v1 of 7 and inputs it to the comparator 11. At this time, relay L2 does not operate.

In addition, when the input voltage is single-phase 200V, relay L1 operates as shown in the second operating state in Fig. 2, relay contacts Ll-1 and LH- conduct to conduction contact B, and transformer Tr The overload reference voltage V2 f is set in the reference voltage setting device 7 by switching to the 200V terminal, and inputted into the comparator 11. Also at this time, relay L2 does not operate. Furthermore, when the terminals are switched in the transformer Tr, the same voltage as before switching is output to the secondary side of the transformer Tr. 8th
As shown in the operating state, relay Ll operates, relay contacts IJI-1+ and Ll-2 conduct to conduction contact B, and power supply voltage is applied to the 200V terminal of transformer Tr1.
, At the same time, relay L2 operates and relay contact L2-1
conducts to the conduction contact B, sets the overload reference voltage v3 of the reference voltage setting device 7, and inputs it to the comparator 11.

In the above-mentioned embodiment, 'tlLH is first classified by voltage, then classified by the number of phases of the AC power supply,
The configuration was configured to classify the s#A of the power source, but the power source #l
It goes without saying that power sources may be classified by type by first classifying them by the number of phases and then by voltage.

The present invention is provided with a voltage detection device for detecting the voltage of a power source connected to a motor, and a phase number detection device for detecting the phase of an AC power source, and a voltage detected by the voltage detection device and the phase number detection device. We have installed a reference voltage setting device that switches the overload reference voltage, which is the standard for determining overload operation of the motor, in accordance with the type of power source.When the power source changes, the voltage detection device detects the voltage of this power source. , the type of power supply 1i1 detected by the in-phase number detection device and determined by these detections.
The overload reference voltage can be automatically set according to i1. Therefore, it is possible to properly determine whether the motor is overloaded, and the normal operation of the device can be guaranteed.

It should be noted that this invention is not limited to the above-mentioned embodiments, and the present invention can be carried out in other ways other than the above-mentioned embodiments.
It is something that

Further, although reference numerals are written in the claims section for convenience of symmetry with the drawings, the mosquito codes do not limit the technical scope of the present invention.

[Brief explanation of the drawing]

The drawings show one embodiment of the invention.
The figure is an explanatory diagram of the electric circuit according to the present invention, and Fig. 2 is an explanatory diagram of the operating state. 5...Phase number detection device 7.--Reference voltage setting device Patent applicant Iseki Agricultural Machinery Co., Ltd. Procedural Amendment (Rei) Commissioner of the Japan Patent Office Shima 1) Haruki Tono 1゛''4
°"'1゜1, Indication of the incident Patent application No. 56-215
797 No. 2, Title of the invention: Automatic power source selection device 3, Representative of the person making the amendment: 8 Takashi Benkai (Date of dispatch: April 27, 1980) 6. Subject of amendment (1) Application (2) Specification ( 3) Drawing

Claims (1)

[Claims] Motor (1) A reference voltage setting device (7) is provided for switching an overload reference voltage, which is a reference for determining overload operation of the motor (1), in accordance with the type of power supply detected by the phase intermittent detection device (5). Automatic power selection device that eliminates mold.