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2. SAFETY INFORMATION

2.1 To avoid fatal accidents, please observe the following:

a. Ensure that you operate the equipment with the power source of correct voltage as provided

by your country;

b. Ensure that you comply with the laws of your country on position for welder’s installation,

high-pressure gas, storage of materials and treatment of exhaust;

c. Ensure that you wear the safety equipment and dress for the protection of your eyes and skin;

d. Ensure that there is proper ventilation in place of welding to prevent injury or harm from

smoke and gas exhaustion;

e. Do not open the DOS shell of the welder or use it in open position.

2.2 Prevention from burning and fire

a. Always keep the welder at least 50cm away from the wall and inflammables;

b. Keep sparks away from tinder or the open holes;

c. Fasten the welder properly with fixed bolts if it is to be installed on high position for use;

d. Do not weld tubes, hermetic tubes or vessels through which combustion gas is traveling.

2.3 Connection and usage

a. Always disconnect the power when trying to connect gas to the welder.
b. Do not touch any electrical components in the welder or wear wet or torn gloves.
c. Make sure the correct cables are being used.
d. Do not put weight on the cable or place the workpiece in contact with the cable.
e. Always make sure the cable is correctly connected and wrap any naked wires with

insulation tape.

f. Please only allow authorized electrician to earth the welder and other accessories.
g. Disconnect all power when not in use.

2.4 Other noticeable points

a. If the welder is put on inclined surface, please make sure it does not fall.

b. Do not use the welding power for tube defrosting.

Summary of Contents for NBC-250D

Page 1: ...BC 250D 350M Attention For your safety please only allow technicians to operate maintain and repair this machine You are advised to read this operation manual thoroughly before operating the machine Please keep this manual for future reference and safety information ...

Page 2: ...ENT 1 Characteristics 2 2 Safety information 3 3 Technical parameters 4 4 Installation and connection 5 5 Function introduction 8 6 Operation 10 7 Daily maintenance and troubleshooting 14 8 Circuit diagram 17 ...

Page 3: ...on function coupled with special arc ignition circuit can lead to almost 100 arc ignition success 1 3 Stable welding process Adopts high speed feedback circuit anti interference system and anti internet fluctuation to fulfill stable welding 1 4 Electricity saving Advanced PWM inverter technology and the compensation from the grid voltage greatly reduce the input voltage hence saves electricity 1 5...

Page 4: ... inflammables b Keep sparks away from tinder or the open holes c Fasten the welder properly with fixed bolts if it is to be installed on high position for use d Do not weld tubes hermetic tubes or vessels through which combustion gas is traveling 2 3 Connection and usage a Always disconnect the power when trying to connect gas to the welder b Do not touch any electrical components in the welder or...

Page 5: ...able range A 60 250 60 350 Output voltage adjustable range V 17 27 17 32 Open circuit voltage V 54 64 Rated duty cycle 60 Room temperature 40 Welding wire diameter 0 6 0 8mm 0 8 1 0mm Insulation grading F Shell protection degree IP21S Dimension W D H mm 475 235 410 mm 565 280 500 mm Weight kg 18 26 5 NB According to CISPR 11 the electromagnetic compatibility of this welder is type A ...

Page 6: ... shocks 4 3 Ventilation To ensure welding quality please minimize the effect the wind has on arc In enclosed space please make sure there is enough oxygen from ventilation 4 4 Power and cable Table 2 Power and cable Power 3Phase AC 380V 50Hz Model NBC 250D NBC 350M Capacity Suitable power 11KVA above 16KVA above Engine power generator 11KVA 2 above 16KVA 2 above Input protective equipment Fuse 26A...

Page 7: ... good conductivity and all naked wires must be wrapped with insulation tape c After finishing the cable connections please make sure the power supply cover is securely closed and the screws are fastened Please do not operate the machine when the cover is open d Please do not exert force onto the cables ...

Page 8: ... 7 Figure 1 Connection Illustration ...

Page 9: ... relative magnitude of wire feeding speed when on standby displays the actual welding current magnitude during actual welding process 2 Voltage display Output voltmeter displays the set value of voltage when on standby displays the actual welding voltage during actual welding process 3 MAG MMA MAG MMA option buttons 4 Crater arc on crater arc off spot welding Crater arc on crater arc off spot weld...

Page 10: ...st spot welding interval time 12 Wire feeding 8A When the control circuit of wire feeder is in a short circuit the fuse will break to protect the transformer 13 Power supply box Used to connect the welder into 380V power 14 Air break switch Aim to protect the welder from overloading or defect Under normal condition the switch is lifted up and stays on 15 Power 2A When the control circuit of weldin...

Page 11: ...e reducing flow meter will heat up b Choose the appropriate wires based on different workpiece then choose the right wire feeding wheel nozzle based on the wires chosen c Press Manual wire feeding button wire is then fed into the torch d Switch to Gas test on the torch panel adjust the flow meter valve choose the appropriate flow and then switch to welding status 6 2 1 Spot weld and short seam wel...

Page 12: ...ed cm min Distance between nozzle and base metal mm Gas Flow L min I shaped butt welding Low speed condition 0 8 0 8 0 9 0 60 70 16 16 5 50 60 10 10 1 0 0 8 0 9 0 75 85 17 17 5 50 6 0 10 10 15 1 2 0 8 0 9 0 80 90 17 18 50 6 0 10 10 15 1 6 0 8 0 9 0 95 105 18 19 45 50 10 10 15 2 0 1 0 1 2 0 0 5 110 120 19 19 5 45 50 10 10 15 2 3 1 0 1 2 0 5 1 0 120 130 19 5 20 45 50 10 10 15 3 2 1 0 1 2 1 0 1 2 140...

Page 13: ... A 10 15 2 0 3 3 5 1 0 1 2 115 125 19 5 20 50 60 10 A 10 15 2 3 3 3 5 1 0 1 2 130 140 19 5 21 50 60 10 A 10 15 3 2 3 5 4 1 0 1 2 150 170 21 22 45 50 15 A 15 20 4 5 4 5 5 1 0 1 2 180 200 23 24 40 45 15 A 15 20 6 5 5 5 1 2 230 260 25 27 40 45 20 A 15 20 8 9 6 7 1 2 1 6 270 380 29 35 40 45 25 B 20 25 High speed condition 12 7 8 1 2 1 6 300 380 32 35 35 40 25 B 20 25 1 0 2 2 5 0 8 0 9 140 19 20 150 10...

Page 14: ...10 C 10 15 1 0 1 2 120 150 20 21 45 50 10 C 10 15 3 2 1 0 1 2 150 180 20 22 35 45 10 15 C 10 15 4 5 1 2 200 250 24 26 40 50 10 15 C 10 15 High speed condition 2 3 3 2 1 2 220 24 150 15 B 或 C 25 300 26 250 15 B 或 C 25 Table 8 welding technology specification4 Plate thickn ess mm Wire diamet er mm Welding current A Welding voltage V Welding speed cm min Distanc e between nozzle and base metal mm Gas...

Page 15: ...e d Avoid machine distortion from impact do not put loads on welder e Keep ventilation on f For long term best performance please conduct regular checks i e regular checks of internal parts and cleaning of some parts g Under normal condition there will be enough accumulation of sparks and oil dusts inside the welder during 6 months If the environment is not as clean there will even more sparks and...

Page 16: ...g time overload running 1 According to the welding machine duty cycle to use 4 Cannot adjust welding current 1 Wire feeder control cable breaks or control PCB is damaged 2 The connection wire of current divider is broken 3 Controlling panel of the welder broke 1 Change wire feeder control cable or PCB 2 Reconnect the lines 3 Change control panel of the welder 5 Unstable arc big splash 1 Wrong proc...

Page 17: ...se After diagnosing the causes e g overloading short circuit and etc change the fuse If the fuse is broken again after closing the circuit please shut off the power and contact us 7 3 2 Problems with the PCB Please contact us 7 3 3 Other faults Please check corresponding parts and change them 7 3 4 Others Please check if there is any wrong or loose connection 7 4 After sale service a Please refer ...

Page 18: ... 3 103P 1KV TR1 C 6 7 8 2 2UF 630V 99 3 1 0 5 9 7 415V FH7 820 467B 2014 09 12 HC S AP2 FH7 820 294C HC Ⅱ AP3 FH7 820 295B R2 1W 220Ω R1 15W 47Ω C1 102P 2KV R3 15W 47Ω C3 102P 2KV R2 15W 47Ω C2 102P 2KV R4 15W 47Ω C4 102P 2KV 3 4 7 8 4 5 4 5 6 5 4 3 2 1 FH7 820 491B FH7 820 482B FH7 820 482B 主控板 PCB1 CN7 1 6 2 3 2 2 FUSE3 8A 1 1 2 2 3 3 1 3 CN8 2 4 5 1 2 3 1 2 4 3 5 CN5 CN1 6 1 2 3 CN10 1 2 4 3 5 ...

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