When multiple different electronic gear ratios need to be used, ● Communication may be relied upon for online modification of P1-04 and P1-06 (RAM address shall be used; or otherwise damage can be easily caused to storage elements of the driver); ● The user may set two DI terminals to function No. 20 (GNUM0) and No. 21 (GNUM1), so as to realize switching through external DI input; in this case, the DI terminal status corresponds to the electronic gear ratio numerator as follows (0 means the terminal is inactive; 1 means the terminal is active):
● When an external terminal is used to switch the electronic gear ratio, the electronic gear denominator is a fixed value; so in this case, please carefully select a proper value for P1-06. Parameter functions: Time constant for smoothing and filtering external pulse command signals. It is inactive when set to 0. Parameter functions: Set the time constant for high-frequency filtering of external pulse command input When the pulse setting position command is used, error may occur to the count of pulses received by the servo driver due to high-frequency disturbance resulted from various factors. Properly setting this parameter can avoid high-frequency disturbance.
If the time constant for pulse input filtering is T f , and the minimum width of input signal is T min , then the input signal and the signal after filtering are shown in the following figure. Compared with the input signal, the signal after filtering is delayed for T f . 113 Technical Manual for EA190 Series Servo Driver V100 GNUM0 GNUM1 Valid electronic gear ratio numerator 0 0 P1-04 0 1 P1-08 1 0 P1-10 1 1 P1-12 Caution☞ 1. P1-02 and the electronic gear ratio are valid for both external pulse command and internal multi-segment position command. 2. Setting range of the electronic gear ratio:1/1000~64000/1. If the range is exceeded, the driver will give an Al032 alarm.
P1-14 External pulse smoothing and filtering time Initial value 0.0 Communication address 010EH Unit ms Time of taking effect Taking effect upon power-on again Setting range 0.0~3000.0 Data size 16bit Control mode P This parameter is intended to smooth input pulse commands, but may cause command delay. It is generally used: when the upper computer does not have the acceleration/deceleration function; when the electronic gear ratio is high; when the command frequency is low; when stepping or instability occurs during motor operation.
Caution☞ To reduce vibration and other problems resulted from abrupt change to the command pulse frequency, the position FIR filtering (P5-23) function can be used. P1-15 Filtering time of external PULSE signal Initial value 9 Communication address 010FH Unit - Time of taking effect Taking effect upon power-on again Setting range 0~255 Data size 16bit Control mode P S