Lenze EVS93xx FlyingSaw - Manual (Page 32)

FlyingSaw
Features of the Prepared Solution
 Prepared Solution Servo PLC / ECSxA 1.1 EN page 2-19
2.15 Homing
After the machine is switched on, the zero point for this measuring system must be made known
to the drive (home position). As the home position is mostly defined by specific sensors (e.g.
home proximity switches, limit switches or the zero pulse from the motor feedback system), it is
necessary to move past these sensors as part of homing. During this process the homing mode
defines the traversing direction for the homing and the type of signals evaluated. The following
homing modes can be selected:
• Homing mode 0:
The drive rotates in positive direction (clockwise rotation) until the negative edge from the
homing switch is detected. The next zero pulse from the motor feedback system or the next
touch probe signal on the digital input allocated defines the home position (machine zero
point).
If the home position does not represent the zero point of the absolute measuring system
used, the home position can be defined in relation to the zero point for the measuring system
using an offset (machine zero distance, C3227/000). After the homing has been completed,
the drive stays on the position 0.000[units]:
In the example shown above, the home position represents a negative value in relation to
the measuring system zero point, because after the acquisition of the zero pulse/touch probe
signal the drive continues to move in the positive direction to a position 0.0000[units].
Homing switch
Zero pulse feedback
or
Touch probe signal
Control signal
"Perform homing"
Status signal
"Homing done"
Homing speed
Home position
C3227/000
1. Negative edge of the homing switch
2. Zero pulse