198
7 EXPANSION CONTROL
7.1 Speed-torque Control
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Precautions at control mode switching
• The start complete signal and the positioning complete signal do not turn ON at control mode switching.
• When "30: Control mode switch", "31: Speed control", or "32: Torque control" is set in "[Md.26] Axis operation status", the
BUSY signal turns ON.
• The motor speed might change momentarily at switching from the speed control mode to the torque control mode.
Therefore, it is recommended that the control mode is switched from the speed control to the torque control after the
servomotors stop.
• Use the continuous operation to torque control mode for the usage such as pressing a workpiece. Do not execute the
continuous operation to torque control in the speed control mode. Otherwise, an unexpected operation might occur at
switching to the position control mode.
• "In speed control flag" ([Md.31] Status: b0) does not turn ON during the speed control mode in the speed-torque control.
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Operation for "Position control mode
Speed control mode switching"
When the position control mode is switched to the speed control mode, the command speed immediately after the switching is
the speed set in "speed initial value selection (b8 to b11)" of "[Pr.90] Operation setting for speed-torque control mode".
When the speed control mode is switched to the position control mode, the command position immediately after the switching
is the current feed value at switching.
The following chart shows the operation timing for axis 1.
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RD77MS4 operation example
Speed initial value selection ([Pr.90]: b8 to b11)
Command speed to servo amplifier immediately after switching from position
control mode to speed control mode
0: Command speed
The speed to servo amplifier immediately after switching is "0".
1: Feedback speed
Motor speed received from servo amplifier at switching.
2: Automatic selection
The command speed is invalid due to the setting of continuous operation to torque control mode.
At control mode switching, operation is the same as "0: Command speed".
0
1
0
1
0
0
10
0
0
20000
0
30000
0
31
30
30
0
[0, 0]
OFF
ON
OFF
ON
[1, 0]
[0, 0]
t
V
30000
20000
[Cd.138] Control mode switching request
[Cd.139] Control mode setting
[Cd.140] Command speed at
speed control mode
[Md.26] Axis operation status
BUSY signal [X10]
Control mode
([Md.108] Servo status1: b2, b3)
Zero speed
([Md.119] Servo status2: b3)
Position control mode
Speed control mode
Position control mode
6 to 11 ms
6 to 11 ms
Содержание RD77MS16
Страница 1: ...MELSEC iQ R Simple Motion Module User s Manual Application RD77MS2 RD77MS4 RD77MS8 RD77MS16 ...
Страница 2: ......
Страница 316: ...314 9 COMMON FUNCTIONS 9 4 External Input Signal Select Function Program example ...
Страница 317: ...9 COMMON FUNCTIONS 9 4 External Input Signal Select Function 315 9 ...
Страница 574: ...572 13 PROGRAMMING 13 4 Positioning Program Examples Parameter initialization program Flash ROM write program ...
Страница 575: ...13 PROGRAMMING 13 4 Positioning Program Examples 573 13 Error reset program Axis stop program ...
Страница 643: ......