4-3 Functions When Multi-function Feedback Option Board (3G3AX-PG01) Is Used Motor Gear Ratio Setting Function •This function is useful for a system with an optional encoder installed on the machine side. •Set the number of actual encoder pulses in encoder pulses P011. •Set a motor-to-encoder rpm ratio in motor gear ratio numerator/denominator P028/P029. •With the above settings, the number of encoder pulses converted into motor shaft data is set in the Inverter. This function performs speed/position detection based on the number of encoder pulses converted into motor shaft data and calculates the orientation stop position based on the number of encoder pulses (P011). 4 Functions Note:
Make sure that the N/D setting is within the range of 1/50 ≤ N/D ≤ 20. (N: Motor gear ratio numerator, D: Motor gear ratio denominator) •When the motor-to-encoder rpm ratio is 1:10, set the following data: Number of encoder pulses (P011) : 1024 Motor gear ratio numerator (P028) : 10 Motor gear ratio denominator (P029) : 100 In this case, the orientation stop position is defined as 4096 divisions of the encoder's one rotation. Note that the concept of the stop position is inverted from the description in "Orientation stop position conceptual drawing" (page 4-126). Position Bias Function •Set this function to apply position command bias in the pulse train position control mode.
The set number of pulses is added to a change value at 2-ms internals. This is used for adjusting the phase of synchronization points during synchronous operation. •Set an addition value in position bias amount P024. A positive value adds the value in the forward direction. 4-124 Parameter No. Function name Data Default setting Unit P028 Motor gear ratio numerator 0. to 9999 Set a motor-to-encoder rpm ratio. 1. P029 Motor gear ratio denominator P011 Encoder pulses 128. to 9999./1000 to 6553 (10000 to 65535) Set the number of actual encoder pulses. 1024. Pulse Encoder (1024 pulses) Gear/Load (1:10) Motor Related functions P024