background image

 

work now. 

1)

 

the working condition should be dry, air humidity should less than  90% 

2)

 

the temperature should around -10

0

40

0

 . 

3)

 

avoid work in the sun and rain, never let water go inside of the machine. 

4)

 

Avoid work in the dusty or cautic air. 

5)

 

Avoid working in strong air  

Safety notice: 

with over voltage,over current and over heat protection,the welding machine will stop working when 
the voltage ,output current and heat is exceed the standard setting .  But the machine may  broken  
by over loaded  works (when the voltage is too high), so we need take care of following conditions : 

1)

 

Make sure the workplace is well ventilated. As the machine

s dimension is not so big, so the it 

require better ventilation when strong current passed through . workers should make sure the 
ventilate part is not blocked ,and the machine should keep 0.3 m away from other goods, in that 
way, the  machine can work better and can keep long working life.                                          

2)

 

 Forbidden over load working workers shold check max load current (according to rated duty 
cycle),keep  the welding current less than max load current. Over load working will reduce life 
of the machine,and may even burn it.                             

3)

 

Avoid over voltage normally, voltage compensate circuit can ensure the welding current keeps in 
standard scope.If the voltage is exceed, the machine may burned, so the user should  notice it 
and avoid it.                                                    

4)

 

If the duty cycle is exceed , the welding machine may self protected and stop work .it means the 
duty cycle is exceed, over heat protection works, so the machine stop working, and the red light 
on the panel is on. In such case, you don't need cut off the power, you should let the fan work  
and the machine will be cooled after some minutes. When the red light is off, the machine can continue  
work again

 

 

The normal problem in welding process  

 The below problem may caused by accessory , the workpiece, the circumstance, the power 
supply, etc, so you should provide good working condition ,avoid following problem.  

A.   strick arc difficulty and unstable arc .                                       

1

make sure the earth clamp and the workpiece is well connected.                                    

2

check every connection.  

B.   output current cant reach rated current.    

  The input voltage is not same as  rated voltage , so the current is not same as the setting.  

C.

 

  The current is not stable in welding.  

The max output current  less than rated,  it may caused by below: 

(1)

 

The input voltage is changed  

(2)

 

The influence comes from electricity net and other equipments. 

D.

 

the welding slot is with gas bubble. 
1)

 

check the gas supply ,make sure no leak of gas. 

2)

 

Check the workpiece, make sure no oil, dusty  on it. 

 

 

Maintain: 

Содержание NBC-250

Страница 1: ...USER S MANUAL NBC 250 MIG MMA TIG WELDING MACHINE ...

Страница 2: ...side can control short circuit in the welding process compared with silicon control welding machine the outgood welding features is as following stable feeder speed light energy saving without noise Little current can also works stable more suitable for welding thin workpiece of low carbon steel alloy stainless steel Also can balance when the voltage is not stable with little spatter deep penetrat...

Страница 3: ...onnector on the panel 3 install the welding wire to the bracket 4 choose the suitable gloove according to the wire diameter 5 insert the wire to the feeder through gose pls take care to avoid wire bend 6 the wire should installed deasil and use the scew to fix the wire If the wire is bend pls cut off this part 7 connect the torch to the socket on the panel and connect the wire to the torch Operati...

Страница 4: ...tage compensate circuit can ensure the welding current keeps in standard scope If the voltage is exceed the machine may burned so the user should notice it and avoid it 4 If the duty cycle is exceed the welding machine may self protected and stop work it means the duty cycle is exceed over heat protection works so the machine stop working and the red light on the panel is on In such case you don t...

Страница 5: ...ind these parts and connect again Avoid wet in inside of machine If any water inside shall test the insulation by megameter continue to use when it is acceptable If the machine cant work for a long time you should packed the machine and locate it in dry environment Workers should clear the dusty of motor on the feeder and paint oil on feeder roller after feeder works every 300 hours CAUTION make s...

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