Lenze EVS93xx CrossCutter - Manual (Page 62)

Cross Cutter
Features of the "Cross Cutter" prepared solution
 Prepared Solution Servo PLC / ECSxA 1.1 EN 2-48
• Homing mode 4:
The drive moves in a positive direction until the rising edge of the homing switch signal is
detected, at which point it starts to reverse. The home position (machine zero point) is
determined by the next zero pulse on the motor feedback system following the next falling
signal edge or by the next touch-probe signal.
If you do not wish the home position to be the zero point of the absolute measuring system
used, you can use an offset value (machine zero distance, C3626/000) to set the home
position to the zero point of the measuring system. Once homing is complete the drive will
stop at position 0.0000[s_units]:
tt
t
t
t
V
t
t 0
s
tt
t
t
t
V
t
t 0
s
Figure 13: Graph of homing mode 4
In the example illustrated above, the home position has a positive value with reference to the
measuring system zero point, because once the zero pulse/touch-probe signal has been
detected, the drive continues to move in a negative direction to the measuring system zero
point (0.0000[s_units]).
If you do not wish homing to end at the measuring system zero point, you can in addition
preset an end position to come after homing (homing target position, C3627/000). This
provides the requisite conditions for setting the measuring system zero point outside the
drive's traversing range.
• Homing mode 5:
In principle, the sequence is the same as for homing mode 4, but with the direction of
rotation reversed.
TIP!
The home position can be set both with the zero pulse from the feedback system and using
a touch-probe signal, derived from digital input (I4 using Servo PLC and I2 using ECS).
However, this is not standard practice for modes 4 and 5.
C3227/000
Zero pulse feedback
or
Touch-probe signal
Control signal
"Homing"
Status signal
"Home position
detected”
Homing speed
Home position
Homing switch signal
1. Rising signal edge homing switch
4. Zero pulse
2. Drive reversing
g_dnMachineZeroDistance (C3626/000)
3. Falling signal edge homing switch