Operating instructions

04/08 Application manual Positioning 19
3.5.1.2 Two different encoders for motor and positioning
In systems where slip may occur, the motor encoder cannot be used as position
encoder at the same time. Due to the slip (e.g. slipping in the case of a wheel/rail
system), the motor encoder cannot approach the actual target with sufficient accu-
racy. By using a position encoder connected to the positioning system, precise posi-
tioning is possible even in the case of a system where slip may occur. The corre-
sponding configurations are described in the following tables. In any case, you will
need a suitable extension module for evaluation of Encoder 2.
Note: If both a motor and a position encoder are used, the function "Elec-
tronic Gear" cannot be used.
Encoder 1 is motor encoder
Encoder 2 is position encoder
Configuration 30 = 240 | 540, motor encoder, position encoder
Encoder 1 Encoder 2 Motor controller Position controller
Operation mode
490
Operation mode
493
Actual Speed Source
766 =
"1 – Speed Sensor 1"
Actual Position
Source
1141 =
"2 – Speed Sensor 2"
Division Marks
491
Division Marks
494
Level 495
Encoder 1 is position encoder
Encoder 2 is motor encoder
Configuration 30 = 240 | 540, position encoder, motor encoder
Encoder 1 Encoder 2 Motor controller Position controller
Operation mode
490
Operation
mode
493
Actual Speed Source
766 =
"2 – Speed Sensor 2"
Actual Position
Source
1141 =
"1 – Speed Sensor 1"
Division Marks
491
Division Marks
494
Level 495
In the corresponding parameters, set up the encoders parameters according to the
properties of Encoder 1 or Encoder 2. The parameters of Encoder 2 are available
only if the corresponding extension module is connected.
Adjust parameter
Actual Speed Source 766 to connected motor encoder. The exter-
nal encoder is evaluated via parameter
Actual Position Source 1141.
Application manual Positioning 1904/08