Nidec Control Techniques Digitax-SF DA21223, Instruction Manual

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35
Digitax SF I
nstruction Manual
Operation
６
6. Operation
5. Position Control Mode
5.
Position Control Mode
Homing is an operation to
align
the
relative position
in the
drive parameters
and the
actual
mechanical position
of
the
machine. When you are using the Positioner function of the
drive
,
perform homing, as necessary.
In incremental systems:
homing is necessary every time the system is powered on.
In absolute systems:
encoder data is retained by the backup batter
y
. Once you perform homing at the time of
installation, homing is unnecessary at power on even after the control power turns off.
9
Appendices Absolute System
■ Types of Homing
There are three patterns of homing.
Select the parameters to set depending on the motion patterns that you need for homing.
User-Specified Position Page 40
Press (Stopper)
Page 42
Home Sensor
(*)
Page 44
■ Homing Methods
２. Homing
User I/O input Page 36
Digitax SF Connect Page 37
*) To perform Homing by using Home Sensor, use I/O input.
Digitax SF Connect
does not support Homing with Home Sensor.
Precautions
Homing based on home position
sensor
front-end
Install the home position
sensor
at the machine-end. Set [HOMING: Movement direction (No.646.0)] to the
direction of moving from the front of the
sensor
towards the
sensor
-front-end.
Setting the homing direction to the leaving-
sensor
direction (to the left of
sensor
below) may result in a collision
to the machine end.
Parameter No.646.1＝０
Detecting the home
sensor
when ORG input= OFF
Parameter No.646.1=1
Detecting the home
sensor
when ORG input = ON
ORG Input
sensor
OFF ON
Homing Direction
Mechanical motion range
CW
direction
CCW
direction
sensor
OFF ON
CW
direction
CCW
direction
Homing Direction
Mechanical motion range
ORG Input
If you changed the command paired-pulse ratio value,
perform homing again after saving the parameters and power cycling.
If you execute Homing by using encoder Z-phase,
configure the start point of Z-phase detection not close to motor Z-phase. Otherwise, the detection position of
Z-phase may become inconsistent. The Z-phase position can be checked by the position where the “encoder
single-turn data” becomes 0.
If any of the following occur during
the
homing motion,
homing will be interrupted resulting in a Homing Incomplete state.
・Servo turns off.
・Clear
Position Error
Counter is executed. When Clear
Position Error
Counter is executed, the motor will
make a quick stop.
・Drive
Limit Switch Input is active
and Clear
Position Error
Counter is executed.