Fagor CNC 8055i FL EN - Digital Servo (CAN or Sercos)

Installation manual
CNC 8055
CNC 8055i
CONCEPTS
7.
SOFT: V02.2X
·363·
Digital servo (CAN or Sercos)
7.12 Digital servo (CAN or Sercos)
General parameters SERSPEED (P120) and SERPOWSE (P121) allow setting the
communications speed and power for Sercos. General parameter CANSPEED (P169) may be used
to set the CAN communication speed.
"C" axis and spindle with a single drive
When operating with Sercos or CAN and using a single drive for both the "C" axis and the spindle,
proceed as follows:
The DRIBUSID parameters for the "C" axis and the spindle must be set with the same value (same
Sercos address). Use two sets of parameters for the drive, one to work as "C" axis and the other
one as spindle. The "C" axis must always be assigned the last set of parameters (7).
It is recommended to set C axis parameter SWITCHAX (P65) to ·10·.
The PLC must handle the change of parameter sets of the drive.
1. When switching over to operating as a C axis, the CNC lets the PLC know by activating the
spindle logic output CAXIS. Communication takes place once the spindle speed is below the
home searching speed.
2. The PLC, when detecting that the CAXIS signal has been activated (leading edge), must select,
at the drive, the parameter set to work as "C" axis. This selection is made through the "Service
Channel".
3. The PLC, once the change of parameter set at the drive has been confirmed, must let the CNC
know. To do that, it must activate the logic input "CAXSEROK" indicating this way that the drive
is ready to work as a "C" axis.
4. From then on, the CNC sends the velocity command to the "C" axis and receives the "C" axis
position signals.
5. On the other hand, when quitting the "C" axis mode, the CNC deactivates the CAXIS signal. The
PLC must select, at the drive, the parameter set to work as a spindle and let the CNC know by
deactivating the logic input "CAXSEROK".
The errors that may be detected via Sercos or CAN will be identified as corresponding to the active
axis, C axis or spindle.
If the "C" axis and the spindle do not share a drive, they will be assigned a different DRIBUSID
identifier and no switching will be required via PLC.
Sercos communication requires a drive version V3.01 or later. CAN communication requires a drive
version V7.02 or later.
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