Mitsubishi Electric MELSEC Q Series User Manual page 83

(4) Setting for the movement amount after near-point dog ON
Pr.13
When the OPR method is the count method, set the movement amount from the position where Near-point dog
signal (X1C) turns on to the original point. Set a value equal to or greater than the deceleration distance from the
OPR speed to the creep speed.
Deceleration distance
=
(pulse)
The following are the setting precautions.
• Set pulse amount so that the position moved from the near-point dog ON does not overlap with Zero signal.
• Calculate deceleration distance without the use of electronic gear.
The following is a setting example.
When parameters are set as follows.
Ex.
• OPR speed: 10kpulse/s (default value)
Pr.11
• Creep speed: 1kpulse/s (default value)
Pr.12
• Deceleration time: 300ms (default value)
Pr.7
V V
Deceleration +
Z c
=
distance
1000
V V
+
Z c
=
1000
(10k + 1k)
=
2000
= 74.25
= 75 (rounded up to the nearest integer)
When the position where the near-point dog turns on is set near the center of Zero signals, "
movement amount after near-point dog ON" should be an integral multiple of pulses per one servomotor rotation. Then the
position moved after the near-point dog ON does not overlap with Zero signal.
For instance, when the number of pulses per one servomotor rotation is 2000, set 2000 pulses.
(OPR speed + Creep speed) (pulse/s)
1000
t
V
P
2
1 T (V - V )
B Z c
2 Vp
300(10k - 1k)
200k
CHAPTER 5 DATA USED FOR POSITIONING
Actual deceleration time (ms)
2
Speed limit value 200kpulse/s
V OPR speed 10kpulse/s
Z
V Creep speed 1kpulse/s
C
b
a
T Deceleration time 300ms
B
Actual deceleration time t=a-b
Setting for the
Pr.13
81
5