Mitsubishi Electric MELSEC-L LD75P User Manual page 788

Term
FEED SCREW
MACHINE FEED VALUE
CURRENT FEED VALUE
SPEED-POSITION SWITCHING
CONTROL MODE
SPEED LOOP GAIN
SPEED LOOP MODE
SPEED LIMIT VALUE
SPEED CONTROL
SPEED INTEGRAL COMPENSATION
SPEED-POSITION SWITCHING
CONTROL
MULTI-PHASE PULSE
786
This is the basic screw in mechanisms that position using screw rotation. Ball screws are often used to reduce
backlash and dimension error.
1 rotation
by the motor
Lead (feedrate per screw rotation)
The OP address at the completion of the machine OPR is stored.
The current position of the machine coordinates determined by a machine having the OP address as a reference.
Even if the current value is changed, this value will not change.
The OP address at the completion of the machine OPR is stored.
The position currently being executed is stored.
This value changes when the current value is changed.
This is one method used for positioning. It is an application for operations such as high-speed movement to a
point unrelated to positioning, then set dimension movement from the switching signal activation point.
Start
Switching signal
High speed
This is one item in the parameters of the servo amplifier, and expresses the speed of the control response during
speed control.
When the load inertia moment ratio increases, the control system speed response decreases and the operation
may become unstable. If this happens, the operation can be improved by raising this setting value.
The overshoot will become larger if the speed loop gain is raised too far, and motor vibration noise will occur
during operation and when stopped.
This is one servo control mode used in positioning. It is a mode for carrying out speed control. Refer to the term
"POSITION LOOP MODE".
This is the max. speed for positioning. Even if other data is mistakenly set to a higher speed than this, the
positioning will be carried out at this speed limit value when it is set in the parameters. The acceleration time
becomes the time to accelerate from a stopped state to the speed limit value, and the deceleration time becomes
the time to decelerate from the speed limit value to a stopped state.
Speed control is mainly carried out with the servomotor. It is an application for grindstone rotation, welding speed,
feedrate, etc. Speed control differs from position control in that the current position (address) is not controlled.
Drive units may differ, even when the same motor is used.
This is one item in the parameters of the servo amplifier, and is used to raise the frequency response during
speed control to improve transient characteristics.
When adjusting the speed loop gain, raising this value is effective if the overshooting during
acceleration/deceleration remains large.
This compensation is set in ms units.
With this control, positioning is carried out to the end point of the movement amount while changing the speed at
the speed switching point during positioning control.
A combination of pulses in which 2 or more phases differ.
2-phase pulses, etc.
A phase
B phase
Phase difference
Z phase
(ZERO signal)
Description
Positioning
feed screw
Incremental positioning