At present a lot of people are using inverter to use external encoder, its frequency setting is simple, easy to operate, just gently turn the external encoder knob, frequency can be set, so everyone know how encoder and converter connection?
Inverter using external encoder notice what?
Because of various frequency converter on the explanation of the value of foreign joint encoder and power requirements are different, so everyone at the operating frequency converter to external encoders, shall be conducted according to the frequency converter to manual operation.
Encoder principle of encoder is a three terminal, its value can be adjusted according to some variation of the resistance element.
The encoder usually consists of resistance and removable brush.
As it moves, a brush along the resistance on the output side won the relations with the displacement with a certain resistance or voltage.
The encoder how to connect with inverter?
First inverter with an external connection between the encoder should recommend using shielded wire, distance between the inverter and external encoders had better not more than 2 meters, more than 2 meters, want to consider the quality of the shielding wire line diameter thickness between cannot little.
Frequency converter the way of the pressure drop can be ignored, if the pressure drop is too big, can be used with a single core copper wire shielding shielding wire.
Then the inverter of the analog output is set to run the frequency, then the regulator can be converted into 4 -
20 ma signal, sent to the signal input end of the frequency converter, so that we can achieve the purpose of control frequency conversion, the inverter frequency setting can be set by an external frequency encoder.
Finally, the sliding side received the inverter voltage at the input of external encoder AVI, the remaining two ends + 10 v and public.
Also theoretically encoder can also control two inverter at the same time, but in order to reduce operating errors, it is best to use two way of the digital signal to the encoder to control the output current, first of all set a current value (
Or the inverter frequency values)
Corresponding to the encoder output current value of the same, in order to achieve the goal of control both frequency converter.
The inverter is best change for the current signal control.
Inverter external use encoder the note 1.
Encoder resistance also cannot too big, in the distance control frequency converter, the deterioration in the anti-interference ability of the encoder.
External encoder adjustment more frequently in the process of work, under the condition of operation of the encoder power also shoulds not be too small, general advice according to the actual loss power to select 5 to 10 times.
Due to considering the problems such as the inverter circuit inside the match each other, the selection of the encoder resistance had better not more than more than 10 k Ω.
Without knowing the inverter under the condition of internal circuit, resistance should not be suitable for adjustment of the encoder is too small, because the resistance of small, will lead to increase the click frequency converter internal control power supply, so it should be noted that.
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