Set the switches on MSB to 'Auto' position. Generator is to be tested under no load.
将主配电板上开关设定在自动位置，试验机组没有负载进行。
Balance weight set free fall emergency braking device, which can realize auto control load loss protection, when the wellhead end accidental loss of load, balance weight free fall.
平衡重设置自由落体紧急制动装置，可实现井口端意外失载后平衡重自由落体坠落不能人控，却能自控失载保护的万无一失。
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