Hitachi SJ300-EL Series, Дополнение к инструкции по эксплуатации, Страница: 22 / 52

Chapter 2 – Explanation of Functions
Note: If before the encoder error, another error (e.g. over current) is detected, then the prior error
causes the trip event. Therefore the encoder error display may not be shown even if there is an
encoder error.
2.9 Frequency Conversion Function
Some users may find it more convenient to monitor and program speed dependent parameters in familiar
units of linear speed, such as feet per minute, meters per second, etc. The inverter has the capability of
displaying certain key parameters in terms of vertical linear speed units rather than in frequency units (Hz),
if so desired. The factory default setting is Hz (frequency).
This function is activated by setting parameter A074 to “01”, and inputting the vertical speed at maximum
frequency into parameter A075. This value is often referred to as the “contract speed” of the elevator. The
inverter does all the calculations to display the proper units.
Parameters that would be converted include Scaled Output Frequency Monitor (d007), Output Frequency
Setting (F001), Multi-speeds 1 – 7 (A020 – A027). Please refer to the parameter tables in Chapter 3 to see
a complete listing of parameters that are affected by this function.
For example, if an elevator system has a contract speed of 250 feet/minute at the motor base frequency of
60 Hz, you would set parameter A075 to “250”, and A075 to “01.” Then all frequency dependent
parameters shown in the tables would be in units of feet/minute.
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