控制和保护回路模拟信号的电压都低于24V直流。
The voltage of the analog signals in control and protection circuits are all below DC 24V.
该系统能够及时准确的检测出吊杆运行过程中的各种故障信号，根据故障情况可以发出相应的报警信号并切断主回路，达到安全保护的目的。
It can detect all the malfunction signals of platform booms in time and exactly, give alarms and cut off the main circuit to protect it.
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