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Frequency setting method of frequency converter
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Frequency setting method of frequency converterABB Inverter and other industrial products produced, is in order to meet the energy saving and environmental protection such a world environment, so the usual production and engineering work, everything will be energy saving as the primary goal, in does not affect the production efficiency of the premise, the maximum reduce the consumption of energy. Today to ABB converter as an example to share the method of setting frequency.
Frequency converter frequency setting method can be divided into two categories, the first category is the use of frequency converter operation panel, the second category is the use of frequency converter control terminals. The first class uses frequency converter operation panel to set up, but the operation panel on the rise and fall of the key, you can achieve the setting of frequency. This method does not require external wiring, the method is simple, the frequency is set with high accuracy, which is a digital frequency setting. The second category is the use of frequency converter control terminal set the frequency, can also be divided into two kinds of methods. The first is the use of an external potentiometer set the frequency; the second is the use of frequency converter control terminal of the close-up function, use electric potentiometer frequency setting.
The first kind uses the external potentiometer to carry on the frequency setting, this method has the following advantages:
(1) the wiring is simple.
(2) the frequency setting is simple and easy to operate.
(3) installation flexibility.
However, the method can not be ignored:
(1) there is a phenomenon of temperature drift.
(2) low anti-interference ability.
(3) the installation distance of the potentiometer is limited.
Therefore, this method is generally used in the speed control accuracy is low, the surrounding disturbance is small, the environment temperature change small.
The second method is used to control inverter terminal specific function. By setting the internal parameters of the frequency converter, frequency settings to achieve the purpose of, compared with the first method, the method has the following advantages:
(1) high - precision frequency setting, an external potentiometer French analog setting method, frequency range is less than the maximum output frequency of + 0.2%, and use electric potentiometer setting the frequency frequency range of the is less than 0.01% of the maximum output frequency.
(2) strong anti-interference ability. Since this is only the input of the switch signal, it is not affected by the interference of the surrounding electromagnetic field.
(3) no temperature drift phenomenon. Due to the cancellation of the external potentiometer, therefore, is not subject to environmental temperature changes.
(4) the installation is flexible and can be installed in any position by SB1, SB2.
(5) the synchronous performance is good, and it can also realize the frequency increase and decrease of the multi frequency converter.
All in all, we should according to the actual needs, the best professional engineers, reasonable choice of frequency setting method, in order to achieve the application effect. In any case, it is not wise to make a decision without knowing the technology.
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