力士乐柱塞泵电机电源的自动控制装置。当压力油罐内的油压值比额定工作油压值降低0.2MPa～0.25MPa时，电接点压力表的指针接点与下限指针接点闭合，发出电信号，通过继电器操作力士乐柱塞泵电机电源接通，使力士乐柱塞泵开始启动泵油。三、当供油使油罐内的油压达到额定工作油压时，电接点压力表指针接点又与上限接点闭合，发出断开力士乐柱塞泵电源的信号，力士乐柱塞泵停止泵油。如此反复循环，实现对油压的自动控制，保证压力油罐内的工作油压在规定的范围以内。另一块是压力信号器，其作用为调速器油压的自动监视装置。
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