RU1796375C - Welding transformer control unit - Google Patents

Abstract

Usage: the invention relates to electrical engineering and can be used to control a welding transformer. SUMMARY OF THE INVENTION: the device comprises a magnetic starter, a time relay, and a tracking system. The sensor is made in the form of an additional winding over the turns of the secondary winding of the welding transformer. 1 ill.

Description

The invention relates to electrical engineering and can be used to control welding transformers.

An object of the invention is to provide a device that automatically shuts off a welding transformer at idle, i.e. when there is no welding process itself.

The drawing shows a schematic electrical circuit of the device.

The proposed device contains in the next unit a toggle switch 1, a step-down transformer 2, to the secondary winding of which are connected the relay 3 and the sensor winding 4, and on the high voltage side - turnip 7, and in the on-off unit: magnetic starter 8 and time relay 9 .

The device operates as follows.

Before starting work, the toggle switch 1 is turned on and supplies power to the transformer 2, and from its secondary winding under low voltage, the relay 3 and the sensor winding 4 are turned on; EMF is induced on the primary winding of transformer 5 and relay 7 is turned on, opening its AD pins 7a in the starter coil 8 circuit. The circuit becomes the next mode. The contactor is then turned on. Now, when the welder closes the electrode 10 on the grounded part at the beginning of welding, the magnetic flux in the transformer 5 is sharply weakened, the EMF in its primary winding decreases and the relay 7 turns off, closes its AD. contacts 7a in the circuit of the coil 8. The starter will turn on, close its own. power contacts 80 - turn on

 transformer 5 into operation, the welding process will begin. At the moment of switching on, the starter will open its AD contacts 8a and 86 and closes the acting contact 8g, bypass contacts 7a. By closing contact 8e, a circuit is prepared to turn on the relay

Time 9. As soon as the welding stops, the process (the electrode will not touch the grounded part) in the sensor winding 4 increases the voltage to a value sufficient (depends on the number of turns of winding 4) to turn on relay 3. The latter turns on, closes. about. the contacts behind in the circuit of the time relay, the relay turns on and, with a time delay, opens its contacts 9a. The starter is disconnected and disconnects the transformer 5 from the mains. The device is in standby mode.

Claims (1)

Formula for Acquisition A welding transformer control device comprising a magnetic starter, a first relay / sensor, a time relay and an earthing switch, the start of the primary H ABOUT about 00 V4 SY the windings of the welding transformer are connected to the first terminal of the first power contacts of the magnetic starter, so that it is equipped with a toggle switch, a step-down transformer, a contactor, a second relay and two fuses, in order to increase reliability the primary winding of the welding transformer is connected to the first terminal of the power contacts of the magnetic starter, and the second terminals of the first and second power contacts of the magnetic starter are connected through a cantor to the first and second network terminals, respectively GOVERNMENTAL, wherein the first network and the terminal via the dial-down transformer primary winding is connected to earth, in parallel with the primary winding of the welding transformer are connected in series the first relay coil, the first normally closed contacts of the magnetic actuator and the first fuse, wherein the parallel winding of the second relay is connected 38Q8 the sensor winding and the secondary winding of the step-down transformer and the second normally closed contacts of the magnetic starter connected in series, the second output of the second power contacts, the magnetic starter through the second fuse, the normally closed contacts of the time relay, the normally closed contacts of the first relay and the winding of the magnetic starter connected to the ground the normally closed contacts of the first relay are shunted by the third normally open contacts of the magnetic starter, and the point and connecting the contacts of the clocks of the time relay and the first relay through the normally open contacts of the second relay, the fourth normally open contacts of the magnetic starter and the winding of the time relay are connected to the ground electrode, 0 in this case, the sensor winding is made in the form of an additional winding of the welding transformer located on top of the turns of the secondary winding of the welding transformer.