
User Manual of EL6-CAN AC Servo
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105
6.15 Multi-turn absolute encoder
The absolute encoder remember position, When the absolute encoder is used for the first time, user need
to move to the home position, and clear the absolute position value of multiple turns through the drive to set
the home position. It is unnecessary to return to home position in the future (except for the absolute encoder
alarm and other situations). It is recommended that the motor is stationary when reading the position to prevent
dynamic data jump.
6.15.1 Parameters setting
Pr0.15
Name
Absolute Encoder Setup
Mode
PP
HM
Range
0~15
Unit
-
Default
0
Index
2015h
0:
Incremental position mode
:
The encoder is used as a incremental encoder, and the position retentive at power failure is not
supported.
1:
Absolute position linear mode
:
The encoder is used as an absolute encoder, and the position retentive at power failure is supported..
It is applicable to the scenario where the travel range of device load is fixed and the encoder multi-turn
data dose not overflow.
2: Absolute position rotation mode
:
The encoder is used as an absolute encoder, and the position retentive at power failure is supported..
It is mainly applicable to the scenario where the load travel range is not limited and the number of
motor single-direction revolution is less than 0~(Pr6.63+1)
5: Clean multi-turn alarm
, and open multi-turn absolute function.
It will become 1 when normal clearance, if it’s still 5 after 3seconds, please deal with according to 153
alarm processing.
9: Clear multi-turn position and reset multi-turn alar
m, open multi-turn absolute function.
It will become 1 when normal clearance, if it’s still 9 after 3seconds, please deal with according to 153
alarm processing. Please remember to do mechanical homing.
Notes:
Set to 9 after homing process finished and servo disabled, valid after restart power-supply
r6.63
Name
upper limit of multi - turn
absolute position
Mode
F
Range
0~32766
Unit
r
Default
0
Index
2663h
While Pr0.15=2, the feedback position will loop between 0 - (Pr6.63+1)*Encoder resolution
6.15.2 Read absolute position
1
、
Steps
:
(
1
)
Firstly, select the multi-turns absolute encoder motor, install the battery, and confirm whether the drive
version supports multi-turns absolute encoder motor;
(
2
)
Set Pr0.15=1 to open absolute encoder. If it is the first time of installation, the drive will alarm Err153.
The reason is that the multi-turn position is invalid due to the newly installed battery of the motor. At this time,
it is necessary to return to the home position of the machine and perform the multi-turn position reset operation
(see multi-turn position reset).
(
3
)
When the absolute value origin is set and there is no battery fault, the alarm will be cancelled
(
4
)
Finally, the user can read the absolute position, even if the power off the position will not lost.