电源电压列在“主要性能参数”表中，在一般情况下，焊机内的电压自动补偿电路将保证焊接电流保持在允许的范围。
Supply voltage in the "main performance parameters" in the table, under normal circumstances, the welding voltage compensation circuit will guarantee automatic welding current to keep the scope.
当电池放电量达到容量的80 %时，电路自动切断负载，防止电池过度放电，延长电池寿命，保证系统（或设备）在供电恢复正常后能正常运行。
It will switch off the load automatically when it discharged closing to 80% of their energy capacity, thus overwork of batteries can be avoided and lifetime may be extended.
为保证车辆的安全运行，在气压制动系统中施加安全保护开关，控制发动机的点火电路(汽油机)或熄火电磁阀电路(柴油机)，可实现低气压时的自动保护。
The safety switch controlling the ignition circuit in gas engine and flameout magnetic valve in diesel engine is used in air brake system to realize the automatic protect.
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