The external use resistor is an external operation form of the inverter, which controls the inverter through the external operation signal generated by the external starting switch and frequency setting potentiometer. The regular external voltage signal of different inverters is different.
We commonly have the following external given voltage standards: one is 0vS+10v, the second is 0vs±10v, the third is 0Vs±5V, and the fourth is 0vs+5v. In addition, there is a kind of current given signal, which is generally 4mAs20mA. The advantage of this method is that it is highly resistant to interference, and it is best to use this method when the control interval is far away.
It is a given signal with an external voltage. The phenomena in the presented questions are generally formed by the following conditions. In line with the analysis of the idea of eliminating faults according to maintenance, we will take the principle of easy first and then difficult. The first point is to look at the parameters set by the inverter, for example, in the combined form, if the external potentiometer is used to adjust the operating frequency, the acceleration time parameter Pr7 should be set according to the control requirements, and the time should not be too long. Taking the inverter FR-A540 as an example, its acceleration time scale can be set up to 05999s.
The second point, the first choice to suspect the problem of the potentiometer, first look at the potentiometer is not matched, because we know that the selection of external potentiometer is very critical, generally in the purchase of the inverter its clarification book on the external electrical cathometer Yin value and power wattage have clear rules, here I want to say more, in the selection of potentiometers to do the following aspects, one is the best potentiometer resistance value to choose the large resistance value, not to the small resistance value; Second, because the potentiometer needs to be frequently adjusted in ordinary work, the wear resistance of the internal contacts should be considered, and the wattage of the potentiometer is not small.
Generally, it is selected according to the practical power consumption of more than 10 times. For example, if the power supply voltage is 10V and the negative value of the potentiometer is 2,000 ohms, then the nominal power of the potentiometer should be more than 1/2W. If the potentiometer used does not match the one on the clarification, the above situation will occur; If the potentiometer standard is consistent, if this situation is presented, the potential should be checked whether there is a problem, first power off with a multimeter to check whether the resistance between the 3 terminals and 2 terminals of the potentiometer is smooth, and then measure the resistance between the 2 terminals and 1 terminal, the positive value is normal, then power on the inverter, and then use the DC 50V gear to measure the voltage to see whether the terminal voltage of the potentiometer is normal.
The third point, if the above is not a problem, it is necessary to consider the problem of the internal circuit of the inverter, at this time, it is necessary to check whether there is a problem with the input and output circuit of the inverter, because there is a problem with the working board, this phenomenon will also be formed!
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Solution(s):
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