Higen FDA7000 Series, Operation Manual

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Appendix
Ⅰ . Servo system application
Ⅰ -2
I.1. Position control application
The electronic gear enable the work-piece movement distance per input reference command
pulse from the host controller to be set to any value. One reference command pulse form the
host controller, that is the minimum position data unit, is called a command unit.
[ Electronic gear ratio setting ]
Input
command pulse
Servo Drive
S M
Servo Motor
Electronic gear
DEN
NUM
ratio Reduction
unit Command
4 pulse encoder motor of Number
)
DEN
NUM
ratio( gear Electronic



♥ Reduction ratio is load shaft revolution over motor shaft revolution
♥ The command unit shows the minimum command unit of the position data to move the load.
♥ Encoder pulse rate
Encoder type Number of motor encoder pulse (ppr)
Incremental
encoder
2000 ~ 6000
Absolute 11bit 2048
Serial 17bit
32768
※
Setting method of electronic gear
Check the mechanical specification including reduction ratio, ball screw pitch etc.
Deceleration ratio
Pitch (P)
Determine the minimum unit(command unit) of the position data while feeds load per pulse.
: When moving the table by 0.001[mm] for 1[Pulse], the command unit is 0.001[mm].