Mitsubishi QD75P1N User Manual page 818

APPENDICES
START COMPLETE
This signal gives an immediate response
notifying the user that the QD75 that was
started is now in a normal state and can start
positioning.
STARTING AXIS
One of the QD75 axis system axes (axis 1,
axis 2, axis 3, or axis 4) or the reference axis
for the interpolation operation is designated as
the starting axis.
STATUS
Data showing the state of the machine.
Collectively refers to signals that turn ON when
the battery voltage drops, during OPR
requests, during dwell time, etc.
STEP FUNCTION
When the operation is designed so that
several positioning data Nos. are
consecutively run, this function can be used to
carry out a test operation for 1 data item at a
time.
STEP OUT
Stepping motors rotate in proportion to the No.
of pulses (frequency), but the motor's rotation
will deviate if the load is too large for the
motor. This is called step out. If step out
occurs, the motor must be replaced by one
with a larger torque. Step out causes the
positioning error to increase.
Motor
Motor
torque
Load
Appendix - 132
STEPPING MOTOR
A motor that rotates a given angle (example:
0.15ø) when 1 pulse is generated.
For that reason, a rotation proportional to the
No. of pulses can be obtained. 2-phase to 5-
phase stepping motors are available. In the 3-
phase type, the rotor rotates in order from A to
C when a voltage is applied. Often found in
compact motors, stepping motors rotate
accurately without feedback. Be careful of step
out when overloaded.
C B
N
A A S
B C
1) First, the A phase is excited
by a pulse.
C B
A A
B C
3) The nearest tooth to the
B phase is attracted, and the
rotation stops.
STOP SETTLING TIME
Refer to the term "DWELL TIME".
STOP SIGNAL
In positioning control, this is the input signal
that directly stops the operation from an
external source.
The operation stops when the external stop
signal (a-contact) turns ON (continuity).
MELSEC-Q
C
A A
C
2) When the B phase is then excited,
the force works in the direction
shown by the arrows.
C B
A A
B C
4) As the excitation phase is
continuously changed, the rotor
rotates in a clockwise direction.