故障检修：
注意：下列操作要求操作者必须具有足够的电气方面的专业知识和全面的安全常识，操作者应持有能证明其能力和知识的有效的资格证件。在进行检修前，我们建议您首先与科跃公司取得联系，并取得认可。
NB-350、NB-500、NB-630故障及排除方法：
故 障 排 除
表头无显示
风机不旋转
无焊接输出 1． 确认空气开关闭合。
2． 输入电缆接的电源是否有电。
3．确认电源没有缺相。
空气开关合不上 1． 空气开关本身质量问题。
2． 三相整流桥损坏，需更换。
3． 检查机器内部是否有短路处。
表头显示正常
风机旋转输出
无焊接输出 1． 检查机内各种接插线是否接触不良。
2． 输出端连接处有断路或接触不良。
3． 控制板损坏（与经销商或厂家联系）。

Troubleshooting:
Note: the following operational requirements operators must have adequate electrical connection expertise and comprehensive security knowledge, the operator should be held to prove their competence and knowledge of effective qualification documents. During maintenance, we recommend that you first jump by companies with links, and has achieved recognition.
NB-350, NB-500, NB-630 Trouble and exclusion method:
Troubleshooting
The first table shows no
Non-rotating fan
Without a welding output. Confirmed air switch closure.
2. The input cable to the power supply and electricity.
3. Confirmation no shortage of power.
Switch on the air with a not. Air quality problems switch itself.
2. Three-phase rectifier bridge damage to the replacement.
3. Check whether the machines have internal short circuit Department.
The first table shows normal
Fans rotating output
Without a welding output. Check-in the line of plug contact.
2. Output connection with the opening or poor.
3. Damage control panel (with manufacturers or distributors).