将本机电源线之地线接地（黄绿色线）或从机壳螺丝钉接地。
Earth the ground wire (yellow-green wire) of the machine or earth it by the screw of the shell.
接地电源，机壳必须接地线，检查线路绝缘情况后，方可试运转。
Four, grounding power supply, the cabinet must be ground, check line insulation situation, and then after the test run.
接地电源，机壳必须接地线，检查线路绝缘情况后，方可试运转。
Four, grounding power supply, the cabinet must be ground, check line insulation situation, and then after the test run.
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