Chapter 3 Before positioning
3- 37
• The above figure describes difference of backlash setting or no backlash setting.
In case of not setting backlash compensation amount, it moves as many as 100,000 pulse forward
and changes the direction and moves backward as many as 100,000 pulse. It may cause error by
backlash. For example, it assumes that backlash is 500 pulse, in case of not setting backlash, final
stop location is 500. To compensate this, setting backlash compensation as 500, when changing
the direction, 100,500 pulse is yielded adding 500 pulse set as backlash compensation amount. So
target stops at the precise stop position.
• The following table indicates real pulse output and stop position in case of setting backlash.
(Absolute coordinates is used.)
Operation
step
Backlash setting
amount
Target
address
Direction
conversion
Real output
pulse
Stop
positio
1
500
10,000 X 10,000 10,000
2 30,000 X 20,000 30,000
3 0 ○ -30,500 0
Remark
• Once backlash compensation amount is set or changed, home return should be executed
otherwise there can be error at the current position by backlash compensation amount.
(10) S/W upper/lower limits during constant speed operation
• It is used to stop pulse output by S/W upper/lower limit detection during constant speed operation by
speed control.
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