Hitachi SJ700-2 Motor gear ratio setting function, Setting of the actual pulse, Count of encoder

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Speed feedback data

Variation of position

command

Variation of position

feedback data

Speed control

Position control

+/-

Selected by A146

P024

ADD

terminal

Position biasing

A145

Speed biasing

- This function allows you to make the speed command bias during operation in pulse train position control mode.

- Specify the bias quantity for the additional-frequency setting (A145), and select a sign through additional-frequency sign selection (A146).

- Assign function "50" (ADD) to an intelligent input terminal. The speed command is biased by the specified quantity while the ADD terminal is on.

A145: Additional-frequency setting

A146: Additional-frequency sign selection

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4.3.10 Speed biasing function

- The position biasing function allows you to make the position P024: Position bias quantity command bias during operation in pulse train position control

mode. This function adds the specified number of pulses to the variation of position data every 2 ms. Use this function to adjust the phase of the synchronization point during synchronous operation.

- Specify the quantity to be added as the position bias quantity (P024).

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4.3.9 Position biasing function

If the ratio of the motor speed to the encoder speed is 1:10, set the following data: Encoder pulse-per-revolution (PPR) setting (P011): 1024

Numerator of the motor gear ratio (P028): 10

Denominator of the motor gear ratio (P029): 100

In this case, the periphery of the encoder shaft is divided into 4,096 sections to determine the points for home search. Note that the conceptual layout of the home search stop position is inverted from that shown in Figure 7-2.

Motor

Encoder (1,024 pulses)

Gear/load

(1:10)

<Example of use>

The motor gear ratio (N/D) must be within the following range: 1/50 ≤ N/D ≤ 20

N: Numerator of the motor gear ratio

D: Denominator of the motor gear ratio

Note 1:

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P028: Numerator of the motor gear ratio

P029: Denominator of the motor gear ratio

P011: Encoder pulse-per-revolution (PPR) setting

Chapter 4 Explanation of Functions

4.3.8 Motor gear ratio setting function

The motor gear ratio setting function allows you to make the inverter effectively control a specific machine in which an encoder is installed at the opposite end of the motor.

Specify the actual pulse count of the encoder as the encoder pulse-per-revolution (PPR) setting (P011). Specify the ratio of the motor speed to the encoder speed as the motor gear ratio (numerator "P028" and denominator "P029").

According to the above settings, the encoder pulse-per-revolution (PPR) setting data converted into motor shaft data is set in the inverter.

The encoder pulse-per-revolution (PPR) setting data converted into motor shaft data is used to detect speeds and positions. The data specified as the encoder pulse-per-revolution (PPR) setting (P011) is used to calculate the home search stop position.

	Item	Function code		Range of data		Description
Numerator of the motor gear ratio			P028		0. to 9999	Setting of the ratio of motor
Denominator of the motor gear ratio			P029		0. to 9999	speed to encoder speed
Encoder pulse-per-revolution (PPR)			P011	128. to 9999., 1000 to 6553		Setting of the actual pulse
setting				(10000 to 65530) (pulses)		count of encoder