Specifications

Applications Ver. 0002 AP - 21
AP.3.2.1 CHANGE OF GEAR RATIO THROUGH SERCOS INTERFACE
Change procedure via Sercos also applicable to the change of Sets.
The CNC changes gear ratios by means of commands M41, M42, M43 and M44. By setting
parameter AUTOGEAR (P006) to "YES", the CNC will automatically generate the previous M
codes according to the selected speed. If AUTOGEAR="NO", the user must include these M
codes into the part-program.
Procedure:
First, determine the number of useful sets and gears by writing into these variables:
GP4 33471 (F00703) SetNumber
GP6 33485 (F00717) GearRatioNumber
Write into the CNC variables which the new set and new gear ratio will be:
SETGEX, SETGEY, SETGEZ, etc .............. for the axes
SETGES ................................................. for the main spindle
SSETGS ................................................ for the second spindle.
The four least significant bits of these variables register the active gear and the other four the active
set as shown in the diagram below:
These writings are done through the Service Channel (slow). This channel is accessed
via part-program instructions, from the PLC channel or from the user channel.
A new PLC mark (SERPLCAC -Sercos PLC Acknowledge-) serves as a confirmation of the
change. It will stay active from when a new set or gear ratio is requested with the previous
variables (SETGEX,etc..) until the Drive assumes the new values for its GV21 parameters:
ActualParameterSet and GV25 ActualGearRatio.
While these mark is active, no other SETGE* change can be requested because the
command would be lost.
Bit
7 6 5 4
0 0 0 0
0 0 0 1
0 0 1 0
etc..
Bit
3 2 1 0
0 0 0 0
0 0 0 1
0 0 1 0
etc..
Set 1
Set 0
Set 2
Range 1
Range 3
Range 2
GV21=0
GV21=2
GV21=1
GV25=0
GV25=2
GV25=1
Gear Ratio 0
Gear Ratio 2
Gear Ratio 1