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250A/300A Engineering Portable ARC/MMA Welder - High Duty Cycle, China Suppliers & Factory Quality
Detailed Information
◆ Installation Environment
When installing, it should be installed in a place that can bear the weight of the welding machine. It is strictly forbidden to install in places where water droplets may splash, such as water pipes. The welding operation should be carried out in a relatively dry environment, and the air humidity should generally not exceed 90%. Avoid welding work in dusty areas or environments containing corrosive gases. Avoid placing the machine on a table with a slope greater than 15° for welding work.
◆ Ventilation Requirements
When the welding machine is in operation, a large working current passes through it, and natural ventilation cannot meet the cooling requirements of the welding machine, so a fan is installed inside to effectively cool the welding machine to make it work smoothly. The user should confirm that the ventilation is not covered or blocked, and the distance between the welding machine and surrounding objects should not be less than 0.3 meters.
◆ Voltage Protection
In general, the voltage automatic compensation circuit in the welding machine will ensure that the welding current remains within the allowable range, if the power supply voltage exceeds the allowable value, the welding machine will be damaged.
◆ Duty Cycle & Overload
The user should pay attention to use the welding machine according to the allowable load duration rate of the welding machine, and keep the current of the welding machine not exceeding the maximum allowable load current. Current overload will significantly shorten the service life of the welder, and may even burn the welder. If the welding machine exceeds the standard load continuation rate, the welder may suddenly enter the protection state and stop working, which means that the welder exceeds the standard load continuation rate, and the excessive heat triggers the temperature control switch, so that the welder stops working. The protection light on the front panel lights up. In this case, you should not unplug the power plug, so that the cooling fan can continue to work to cool the welder. After the protection indicator light goes out and the temperature drops to the standard range, welding can be restarted.
Main Features
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All movements adopt the latest and mature IGBT full-bridge inverter technology.
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Acid/alkaline electrodes, stainless steel electrodes for stable welding.
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Complete undervoltage, overcurrent, overheating and other protection functions, safe and secure.
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The thrust current is continuously adjustable, effectively solving the problems of sticking welding rod and arc interruption.
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Accurate digital display current preset, easy and intuitive operation.
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Standard three-proof design, suitable for various conventional harsh environments, simple and convenient to operate.
Working Connection Diagram
Product Parameters
| Model | ZX7-400G | ZX7-500G |
| Input Voltage | AC 380V | AC 380V |
| Input Frequency | 50Hz/60Hz | 50Hz/60Hz |
| Rated Input Capacity | 13.3Kva | 15.2Kva |
| Rated Input Current | 20A | 23A |
| No Load Voltage | 67V | 70V |
| Rated Output | 295A/31.8V | 330A/32V |
| Output Current Range | 30-400A | 30-500A |
| Rated Duty Cycle | 80% | 40% |
| Efficiency | 80% | 80% |
| Insulation Class | F | F |
| Shell Protection Grage | IP21S | IP21S |
| Suggested Electrode Max. | Φ2.5-5.0mm | Φ2.5-5.0mm |
| Dimensions | 470*235*435mm | 515*265*480mm |
Installation Attentions
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Input voltage: 380V AC±10% 50/60Hz
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Input cable: 4mm², length ≤ 3m
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Power switch: 63A
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Output cable: 25-35mm²
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Ambient temperature: -10℃~+40℃
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Usage condition: No blocked on air inlet & outlet. No sunlight exposure. Pay attention to dust prevention.
Standard Accessories
1x Electrode Holder
1x Ground Clamp
1x Welding Mask
1x Brush/Hammer
Optional Accessories
Welding Helmet
Welding Gloves
Electrodes E6013
Lift TIG TORCH
Frequently Asked Questions
What are the environmental requirements for installing this welding machine?
The machine must be installed in a location that can bear its weight. It should be operated in a relatively dry environment (humidity ≤ 90%) and kept away from splashing water, dust, and corrosive gases. Avoid operating the welder on a surface with a slope greater than 15°.
How much clearance space is required around the welding machine for cooling?
To ensure proper ventilation and prevent overheating, make sure the air inlets and outlets are not covered or blocked. Maintain a minimum distance of 0.3 meters between the welding machine and any surrounding objects.
What happens if the input voltage exceeds the allowable range?
Although the welding machine features an automatic voltage compensation circuit to keep the output current stable, input voltage that exceeds the allowable limit can cause severe damage to the machine.
What should I do if the welder suddenly stops working and the protection light turns on?
If the protection light turns on due to overload or overheating, do not unplug the power. Keep the machine turned on so the internal cooling fan can continue running to cool down the components. You can resume welding once the protection light goes out and the internal temperature returns to normal.
What are the electrical requirements for installing the ZX7-400G and ZX7-500G?
Both models require an input voltage of 380V AC±10% (50/60Hz), a 63A power switch, and an input cable size of 4mm² (with a maximum length of 3 meters). The recommended output cable is 25-35mm².
What types of electrodes can be used with this welder?
Thanks to the advanced IGBT full-bridge inverter technology, this machine is suitable for stable welding with both acid/alkaline electrodes and stainless steel electrodes.