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Appendix - 38
MELSEC-
A
APPENDICES
MOVEMENT AMOUNT PER PULSE
When using mm, inch, or angle units, the
movement amount is calculated and output
from the machine side showing how much the
motor shaft moves per pulse. Positioning
accuracy in smaller units is not possible.
On the motor side, the movement amount per
axis rotation is normally designed as a
reference, so it is calculated as follows.
Movement amount per pulse =
P rate
Movement amount
per rotation
No. of pulses per
encoder rotation
Amount the motor moves (travel) per pulse.
MULTI-PHASE PULSE
A combination of pulses in which 2 or more
phases differ.
2-phase pulses, etc.
A
phase
Phase difference
B phase
Z phase
(ZERO POINT signal)
MULTIPLYING RATE SETTING
The P rate. Refer to the term "P RATE".
NEAR-POINT DOG
This is a switch placed before the zero point.
When this switch turns ON, the feedrate is
changed to the creep speed. Because of that,
the time that this switch is ON must be long
enough to allow for the time required for
deceleration from the feedrate to the creep
speed.
ON
OFF
Feedrate
Creep speed
Time
Near-point dog