4.1 High-speed Feeding and Cutting Operations
4-7
Feed Axis
Operation
4.1.3
Gain Selection (G-SEL)
Feed axis operations include high-speed feeding (G00), cutting (G01, G02, etc.), jogging, and handle pulse
generator feeding. You can select the control function and gain bank required for each of these movements.
Terminology: Gain Bank
A gain bank is a group of control parameters. This enables you to select a gain bank and control functions for
different operation modes.
(1) Control Functions
For machine tools, high-speed feeding positioning operations (G00) and cutting operations (G01) are per-
formed. High-speed feeding and cutting operations each have their own set of control functions.
The SERVOPACK can select the control functions that are suitable for each of these operations.
Set parameters Pn070.0, Pn070.1, and Pn071.0 to enable or disable the control functions.
Select the axis operation modes and gain banks with the SVCMD_IO.GSEL parameter to the INTERPOLATE
(34 hex) command.
(2) Gain Banks
A gain bank is a group of four gain parameters for a particular axis operation.
The following combinations of gain banks and control functions are used depending on the feed axis opera-
tion.
Select the correct operation mode from the host controller for either high-speed feeding (including jogging,
stepping, and handle pulse generator operations) or cutting operations.
Gain Banks
Related Parameters
Operation Mode
Required Operation
Control Functions That Are Used
Cutting operations (G01, G02, etc.)
High-precision cutting
Predictive control and quadrant projection
compensation
High-speed feeding operation (G00) Machine vibration suppression
Model following and velocity feedforward
Axis Operation
SVCMD_IO(CMD)
Control Functions
G-SEL
Bit 11
Bit 10
Bit 9
Bit 8
Pn070.0
Pn070.1
Pn071.0
Operation Mode
Gain Bank
Predictive
Control
Quadrant
Projection
Compensation
Internal Speed
Feedforward
Control and
Model Following
Control
Cutting
operation
0
Gain bank 0 (fixed)
0 or 1
0 or 1
–
High-speed
feeding
operation
1
Gain bank 1 (fixed)
–
–
0, 1, or 2
Spindle axis
operation
2
Select from gain
banks 0 through 3
–
–
–
Reserved.
3
Gain bank 3 (fixed)
–
–
–
Parameter
Name
Digit
Function
Pn070
Function at Cutting Feed
0
Predictive Control: 0 = disabled, 1 = enabled
1
Quadrant Projection Compensation: 0 = disabled, 1 = enabled
Pn071
Function for Fast-forward
0
None
1
Internal speed feedforward
2
Model following