1. Electronic gear ratio parameter introduction
The so-called "electronic gear" function has two main applications: one is to adjust the number of command pulses required to rotate the motor one turn to ensure that the motor speed can reach the required speed. For example, the maximum transmission pulse frequency of the host computer PLC is 200KHz. If the electronic gear ratio is not modified, the motor needs 10,000 pulses for one rotation, then the maximum motor speed is 1200 rpm. If the electronic gear ratio is set to 2:1, or every revolution When the number of pulses is set to 5000, the motor can reach 2400 rpm.
For example, the electronic gear ratio is set to 1:1 or the number of pulses per revolution is set to 10000, and the highest transmission pulse frequency of the upper computer PLC is 200KHz.
2. Calculation of the number of pulses per revolution and the ratio of electronic gears
The number of pulses per revolution or the electronic gear ratio is calculated in the following order of 1 to 6.
note:
(1) The number of pulses per revolution and the electronic gear ratio can limit the amount of command required for the servo motor to rotate one revolution. The two are complementary, but the priority per pulse is higher than the electronic gear ratio, only the pulse per revolution. The electronic gear ratio will only take effect if the number is set to 0. This is something the user needs to pay attention to. In special cases, if the number of pulses per revolution is calculated as a decimal, the electronic gear ratio should be considered.
(2) When P2-02 and P2-03 exceed the setting range, set the numerator and denominator to an integer within the settable range. The difference in the case of not changing the ratio does not affect the use.
(3) The resolution of the motor encoder that is present without any special explanation is 2500P/R.
(4) The command unit does not represent machining accuracy. Refining the command unit amount on the basis of mechanical precision can improve the positioning accuracy of the servo. For example, when the lead screw is applied, the precision of the machine can reach 0.01 mm, so the command unit equivalent of 0.01 mm is more accurate than the command unit equivalent of 0.1 mm.
3. Setting example of electronic gear
Example:
The supplementary explanation of the above example: the number of the upper machine pulse is 5000, the pass is, the screw pitch is 5mm, the pulse equivalent requirement is 0.001mm, so the number of pulses is 5/0.001=5000. The encoder feedback pulse is 131072 one revolution (servo motor), but due to the shifting mechanism, it is 3/2.
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