How To Use Scale Measurement Function - Mitsubishi Electric MELSERVO-J4 Series Transition Handbook

Part 7: Common Reference Material

6.3.3 How to use scale measurement function

(1) Selection of scale measurement function
The scale measurement function is set with the combination of basic setting parameters [Pr. PA01] and
[Pr. PA22].
(a) Operation mode selection
The scale measurement function can be used during semi closed loop system (standard control
mode). Set [Pr. PA01] to "_ _ 0 _".
(b) Scale measurement function selection
Select the scale measurement function. Select "1 _ _ _" (Used in absolute position detection system)
or "2 _ _ _" (Used in incremental system) according to the encoder you use.
(2) Selection of scale measurement encoder communication method and polarity.
For MR-J4-_B_-RJ servo amplifiers, set the following "Load-side encoder communication method
selection" of [Pr. PC26] as necessary.
The communication method differs depending on the scale measurement encoder type. Select "Four-
wire type" because there is only four-wire type for synchronous encoder.
Select the cable to be connected to CN2L connector in [Pr. PC26].
Select a polarity of the scale measurement encoder with the following "Encoder pulse count polarity
selection" and "Selection of A/B/Z-phase input interface encoder Z-phase connection judgement
function" of [Pr. PC27] as necessary.
[Pr. PA01]
1 0 0
[Pr. PA22]
0 0 0
Scale measurement function selection
0: Disabled
1: Used in absolute position detection system
2: Used in incremental system
[Pr. PC26]
0 0 0
Load-side encoder cable communication method selection
0: Two-wire type
1: Four-wire type
When using a load-side encoder of A/B/Z-phase differential output method, set "0".
Incorrect setting will trigger [AL. 70] and [AL. 71].
Setting "1" while using an MR-J4-_B_ servo amplifier will trigger [AL. 37].
POINT
"Encoder pulse count polarity selection" in [Pr. PC27] is not related to [Pr. PA14
Rotation direction selection]. Make sure to set the parameter according to the
relationships between servo motor and linear encoder/rotary encoder.
Operation mode selection
Setting value Operation mode
Semi closed loop system
0
(Standard control mode)
7 - 154
Control unit
Servo motor-side
resolution unit