The interference rejection measure of system of numerical control Plasma Cutting

Right high frequency bring arc implement raise screen hood, reduce high frequency radiate; B.

Transform the control line road of plasma power source. The 220V of control power source of machine of former KLG-260Plasma Cutting is brought from voltage of electrified wire netting directly, case / destroy arc control line is direct from cut machine inside derivative to ark of numerical control report, the power source of meantime and numerical control CNC is unified case span the wire cable of 10 much M is worn, such plasma rise / the high frequency interference that destroys arc is caused, the electromagnetism interference that big electric current causes strings together electrified wire netting directly. The strong report control line that measure is a 220v increases segregation transformer, rise at the same time / the control line of relatively weak phone that destroys the control signal of arc connects segregation of electric equipment of adopt a young relative to be communication 24v enters cabinet of numerical control report. C.

2 side of arrange almsgiver transformer, side increase other interference rejection RC is absorbed circuit and pressure quick resistor, hit contactor and relay block of two upright paralell connection allows coil circuit, dc part installs capacitance of high frequency bypass, all purposes of these measure are to control interference source, reduce the pollution of voltage of pair of electrified wire netting. Device of 2 numerical control (CNC) with the numerical control of interference rejection measure of servo unit the CNC device of system of plasma arc cut is mixed the core part that servo unit is systematic work, its power supply source is the main avenue that interference enters. Electrical interference basically is the impedance coupling generation that passes power supply line, all sorts of high-power use electric device is main interference source. 2.

1 power source uses plasma of screen line numerical control into the line the power supply cord of arc cut system. Cut provided cathode clue and plasma to rise / destroy a suspension is in arc control line on slip bracket, be equivalent to parallel taking a line 20 much M, and case / destroy arc control line, cut provided cathode clue to come from plasma power source, cut about a hundred electricity of the dc on provided cathode clue, the electric magnetic field that it produces and high frequency bring arc implement high frequency signal is met through coupling pair of numerical control device (CNC) with servo unit power source causes electromagnetism to disturb. The screen cable that is screen layer with copper and aluminium can restrain interference of high frequency electromagnetism effectively, metabolic electric field still can be restrained to be opposite after screen layer ground connection the static electric induction of core line. 2.

The filter of use power source of filter of 2 power source is indispensable interference rejection component, in high frequency with low frequency paragraph beneficial interference controls function. The note answers to have when using: A.

Filter should be installed in electric metal apparently, or through braiding ground connection belt and ground connection dot are linked together; B.

The installation position of filter should approach point of entry of power supply cord as far as possible; C.

The input of filter and output had better use screen line or double skeining thread; D.

Should avoid to belong to and output a line mutual coupling, prohibit input and outputting line bundle up to use screen line together absolutely. 2.

The use of transformer of 3 power source uses the power source transformer that takes screen, screen layer wants the communication with side winding 0 lines are linked together, can prevent interference to enter 2 side of power source transformer, what numerical control device and servo unit use the power source transformer that takes screen to still can prevent mutual interference apart. Among them numerical control device can convert purify communication stabilizer, or increase the interference that with spectrum balanced law principle makes to restrain implement, the action of the ability that enhances its to fight electrified wire netting to disturb reachs since the meeting. 2.

The strong weak report takes the voltage in wire strong wire, electricity strictly apart change inside 4 ark is led big, produce intense electric field change, form electromagnetic wave interference, form serious effect to control line of the line around, weak phone. Make line is far from strong electrical wiring, reasonable choose screen line, double skeining thread, can avoid signal to transmit the interference signal in the center. 2.

Line uses screen cable to choose screen cable to be able to restrain the interference that passes electromagnetism induction and static electric induction to enter transmission line by empty magnetic field of stray report float between 5 ark and ark. And the ground connection of screen layer uses means of true odd termination ground. 2.

Logarithm of 6 reliable ground connection system accuse the ground connection craft of system of plasma arc cut, should cause enough take seriously, the athletic section that makes go up in orbit because of its CNC part and servo unit, interference loses by force to have very big concern with ground connection means of the system. A.

The interference that because terrestrial electricity block recommends alternating current line of force,communication ground and the departure that shed the ground continuously avert transmits control equipment, assure to control the security of parts of an apparatus of systematic unit interior already, can increase systematic dependability and stability again, the terrestrial electricity that reduces facility of strong electric current dries faze. B.

Will logically float sky is mixed imitate ground parts float sky is to point to control equipment logically, join without conductor between imitate ground and earth, with float sky " the ground " the referenced n that makes a system. This makes radiate of ministry of plasma arc substandard does faze and static to wait to be able to get inhibition greatly. As a result of logically the interference response that float sky will increase imitate circuit tomorrow, a kind of good method makes mix imitate ground receive apart logically discharge in respective converge, pass the converge platoon of imitate ground a capacitance to be nodded in the ground connection of street render again next. To imitate quantity, form dc float ground, communicate in all the system of the ground. C machine ark is good receive plasma of earth numerical control of arc cut machine tool cover an area of an area bigger, best and alone laid receives earth unit; And ground connection device should be mixed ark of the slideway of the machine tool, machine even wire cable slides bracket joins reliably. Such making that the voltage of high frequency interference of the induction on housing has the leak channel of a low impedance, charge of made nonexistent save up and the likelihood that makes housing voltage elevatory, safer to personnel, and be helpful for controlling interference impact. 2.

Below the case that conditions of 7 other auxiliary sex measure permit, the power source of numerical control device uses illume phone, because illume report is opposite clean; Dc relay coil and diode of follow on current, communication relay coil and RC block allows circuit, restrain twinkling desiccate faze. After 3 conclusion are designed through having integrated interference rejection to the system, the dependability of arc cut system gets numerical control plasma civilian to improvement, and arc rises automatically in implementation / destroy arc is controlled, after the system considers to succeed, fault rate decreases greatly, the very strong interference rejection performance that the system achieved place of system of plasma arc cut to ask. CNC Milling CNC Machining