6. Precise homing with encoder INDEX signal
Encoder INDEX signal highly improves accuracy and repeatability of homing. As in CSMIO/IP-A it works
with incremental encoders, after switching on the power the control system does not know the axes posi-
tion. That is why we need to perform homing (or reference travel as other may call it). Homing precision is
especially important in situation when careful workpiece machining will be stopped because of some rea-
son (like power failure). After system restart we must perform homing and it depends on homing precision
how will the machine fit into the dimension.
Homing "on index" sets motor rotor almost always in the same position. If there are any deviations - they
may result from poor mechanics condition, in example machine large backlash.
It is always worth to connect index signal for encoder output of servo drive to get more precise homing.
6.1 Homing on "index" enable
In plugin configuration window there is possi-
bility to select homing mode for each axis:
common or on index.
The configuration was described in detail in
Chapter 10.
Remember to enter pulses per rev value in „Encoder Pulses/Rev” area. It is necessary so the function that
checks if there is a safe distance between HOME switch activation and INDEX position works correct. Too
small distance may cause homing deviations of even whole motor shaft rev.
CS- Lab s.c. – CSMIO/IP- A - CNC controller
Page 41
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