Frequency of impulses should be regulated in range from 5 to 120 Hz.
冲动的频率应该加以管理，范围从5到120赫兹。
Adjust the motor frequencies of transmitter within (5-50) Hz, and not higher or lower than this range in accordance with the requirements of temperature and frozen freight situation for IQF machine.
根据单冻机的温度和货物冻结情况要求调节传送装置的电机频率，在(5—50)赫兹之间，不能高于或低于这个范围。
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