Mitsubishi Electric 800 Series Instruction Manual (Function page 173

• When the roll feed mode 2 is selected (Pr.1293 = "2"), positioning operation is performed with the position command set
to 0 and the current position set to the value of the previous current position data decremented by the droop pulse at start.
The difference between the position command and the current position at each start is not accumulated.
Pr.1293="1"
Point table selection signal
Servo-ON (LX)
Start command
Forward rotation
Speed
Position
Droop pulse
• When the roll feed is enabled, the home position return operation is not required.
• Use the roll feed mode when the position command data and the current position data are within the range from -
2147483648 to 2147483647.
• The following shows the operation example during positioning by point tables with Pr.1293 = "1" (roll feed mode 1).
Target position (before
Point table
electronic gear)
Pr.465 = "1000", Pr.466 =
1
"0"
Pr.467 = "1000", Pr.468 =
2
"0"
Pr.469 = "500", Pr.470 =
3
"0"
*1 Turn ON the start signal 5 ms or more after the point table selection signal is turned ON.
*2 After the start signal is turned ON, the ON state should be retained for 20 ms or longer.
172
7. Position Control
7.3 Simple positioning function by point tables
ON
ON
ON ON
Ideal speed command
Hz
1000
Position
command
Current
position
0
0
Home position data clear
Droop pulse clear
Maximum
speed (Hz)
Pr.4 = "60"
Pr.5 = "40"
Pr.6 = "60"
LX
RH *1
RM *1
RL *1
STF *2
STR *2
Target position
[before electronic gear]
60Hz(Pr.4)
Speed command
0
(Pr.1222)
Travel distance
= 1000
Position command
[before electronic gear]
2000
1000
0
0 clear
Pr.1293="2"
Start command
Forward rotation
Speed
Position
1000
Droop pulse
otime
Acceleration Deceleration
time (s) time (s)
Pr.1222 = "1" Pr.1223 = "1"
Pr.1226 = "2" Pr.1227 = "2"
Pr.1230 = "1" Pr.1231 = "1"
ON
ON
ON
ON ON
1000 2000(+1000) -500
40Hz(Pr.5)
(Pr.1231)
(Pr.1230)
1s
1s 2s 2s
1s
(Pr.1226) (Pr.1227)
1s
(Pr.1223)
60Hz(Pr.6)
Travel distance Travel distance
= 1000 = -500
0 clear
-500
ON
ON
ON ON
Ideal speed command
Hz
Position
command
Current
position
0
0
Home position data clear
Auxiliary
function
Pr.1225 = "1"
Pr.1229 = "10"
Pr.1233 =
"100"
ON
ON
-1000
Time
Travel distance
= -1000
0 clear
time
-1000
otime