求翻译：松下电梯自主研发了行业领先的VVVF变频门机系统，使开关门速度可以自由调节，整个系统安全可靠，运行平稳。门负载检测器时刻监控着每个楼层梯门负载的变化，当受到异常阻力时梯门自动重新打开，确保乘客安全。是什么意思？

Panasonic lift independently developed the industry's leading vvvf frequency conversion door system, door switch speed can be freely adjusted, the entire system is safe and reliable, running smoothly. The door load detector always monitors the changes in load of each floor staircase door by the abno

Panasonic elevator autonomous research and development of the industry's leading inverter VVVF door phone system to allow a switch door speed can be freely adjusted, and the whole system is safe and reliable, smooth operation. The load test is always monitoring the staircase door each floor load cha

The Matushita elevator has independently researched and developed the profession leading VVVF frequency conversion gate machine system, enables the switch gate speed to be possible to adjust freely, overall system safe reliable, the movement is steady.The gate load detector time is monitoring each f

Panasonic has developed industry-leading VVVF inverter for elevator door machine system, slow can freely adjust the opening closed, the entire system is safe and reliable, smooth running. Load detection monitors every floor elevator door load changes, when subjected to abnormal ladder door automatic

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