Table of Contents
Advertisement
3. SPECIFICATIONS
MELSEC-A
(3)
Zero return address
This address is
set as the present value of the home position upon
Set the zero return address to either the upper or lower stroke limit set
completion of zero return.
in the parameters.
(4)
Zero return speed
.
Sets the zero return speed. (Refer to Fig.
3.14.)
( 5 ) Creep speed
The creep speed is low-speed until stopped after decelerating from the
zero return speed by the zero return point dog being
ON during zero
return. (Refer to Fig.
3.14.)
The creep speed varies according to the detected error in the case of
zero return by a zero-phase signal and to the size of an impact during
collision in the case of zero return by stopper.
Therefore, set the creep speed taking the error range and the size
of
an impact into consideration.
Zero return speed starts deceleration.
Actuator signal
Creep speed
/
I
I
'Zero return
dog"
Actuator
Drift
(according
to
drive
unit)
ON
OFF
U
U
J - -
Zero-phase signal
- t =
=I-
Adjust the actuator so that its OFF
position is near the center of the
zero-phase signal.
Torque limit valid range
Fig. 3.14 Zero return and Creep Speeds
(6) Zero return dwell time
The zero return dwell time is the time
until zero return is completed after
Set the time until stopping by the stopper after
the zero return speed
Even
if
any value (in the setting range) is input at the time other than
the near-point dog goes ON during zero return by stopper stop
1).
decelerates to the creep speed.
stopper stop
(l),
there is no problem.
3-26
Advertisement
Table of Contents
