８
To prevent electric shock, please do ground the green-yellow wire well;
Wear protective equipments
To prevent the hurt of welding gas, dust, arc, spatter and noise, please do wear some protective equipments and
install necessary ventilation devices. Keep kids away from the dangerous area;
The cylinder of shielding gas should be fixed well to ensure there is no shock;
Welding machines and procedure should be away from combustible and explosive material, do not weld
closed container. It is dangerous to weld the hand-hole of container, please make sure there is no combustible
and toxic gas on the weld before operation;
Keep sharp objects and other wastes away from the inner machine;
If dropping or cracking, the welding machine can not be used again without checking by qualified individuals.
二、
Working condition and environment
1.
Operation place
If machine is not operated according to the below items, the welding performance should be poor even damage
the machine!
The machine should be placed in where there is no sunshine shooting, rain, dust, etchant gas and
combustibles, the environment temperature is to be in the range of -10
℃
～
40
℃
.
The machine should be placed in where there is no metal waste;
Keep the welding power source away from wall or other closed objects at least 30cm, the distance between
two welding machine is also said to more than 30cm;
Operate this machine in where there is no wind.
Operate this machine in where the altitude is lower than 1000m.
2.
Power supply
Power
：
3
～
50Hz380VAC
Fluctuation range of distribution voltage
：＜
±15%
Fluctuation range of frequency
：＜
±1%
Unbalance ratio of three phase voltage
：＜
±5%
When engine generator is used: make sure the output power of the generator is 2 times larger than the rated
input power of welding power source, compensating coil is also needed.
三、
Technical Parameters
Item
Unit
Model
NB-250LT
NB-315LT
Input power
V
／
Hz
3
～
380±15
％
50
／
60
Rated input capacity
KVA
10.3
14.6
Rated input current
A
15.7
22.1
rated output current
A
250
315
rated output voltage
V
26.5
29.8
Rated open voltage
V
64
Duty rated
-
35%
（
40
℃）
efficiency
-
85
％
86%
efficiency factor
-
0.74
0.75
Output Voltage adjustment
V
15
～
32
Wire feeding speed
m/min
1.5
～
28
Suited wire diameter
mm
Φ0.8
、
Φ1.0
Cooling mode
-
Air cooling
