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17. APPLICATION OF FUNCTIONS
17.1.3 How to use the scale measurement function
(1) Scale measurement function selection
The scale measurement function is set with a combination of basic setting parameters [Pr. PA01] and
[Pr. PA22].
(a) Operation mode selection
The scale measurement function can be used only when the semi closed loop system (standard
control mode) is selected. Set [Pr. PA01] to "_ _ 0 _".
(b) Scale measurement function selection
Select a setting of the scale measurement function. Select "1 _ _ _" (Used in absolute position
detection system) or "2 _ _ _" (Used in incremental system) for [Pr. PA22] according to the encoder
in use.
(2) Selection of scale measurement encoder communication methods and polarities
The communication method varies depending on the scale measurement encoder type used. For the
communication method for using a linear encoder as a scale measurement encoder, refer to "Linear
Encoder Instruction Manual". Select "Four-wire type" because there is only the four-wire type for a
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 an encoder of A/B/Z-phase differential output method, set "0".
Incorrect setting will trigger [AL. 70] and [AL. 71].
POINT
"Encoder pulse count polarity selection" of [Pr. PC27] is not related to [Pr. PA14
Rotation direction selection]. Make sure to set the parameter according to the
relationships between the servo motor and linear encoder/rotary encoder.
Operation mode selection
Setting value
Operation mode
Semi closed loop system
0
(Standard control mode)
17 - 5
Control unit
Servo motor-side
resolution unit
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