
B-63943EN-1/02 11.SPINDLE SPEED FUNCTION
- 1249 -
11.4 SPINDLE OUTPUT CONTROL BY THE PMC
Overview
The PMC can control the speed and polarity of each spindle motor,
connected.
The first to fourth spindles each have their own individual interfaces.
By using a PMC ladder program, the user can control the spindles as
desired.
This section describes how to use the PMC to control spindle rotation
and provides example applications.
Explanation
- Switching control
This function can be used to specify the following:
- Spindle motor speed (number of rotations)
- Output polarity for each spindle motor (direction of rotation)
Usually, the CNC is used to control the speed and polarity of the first
spindle motor. If a multispindle control function is added, the CNC
can also control the second to fourth spindle motors.
This function allows the user to select whether the CNC or PMC is
used to control the speed and output polarity of the spindle motors.
- Specifying the spindle motor speed
The PMC can be used to specify the spindle motor speed upon
executing the following:
- Switching the controller from the CNC to the PMC, by issuing
SINDx signal
- Setting the spindle motor speed data, calculated by the PMC, in
spindle control signals R01Ix to R12Ix
When controlled by the PMC, the spindle motor speed is not affected
by any signal (for example, the spindle speed override signal) or
parameter settings (for example, the maximum speed clamp
parameter) related to the spindle speed command of the CNC spindle
control function.
→ If the multispindle control function is added, however, the
spindle stop signal *SSTPx <Gn027#3, #4, #5, Gn026#6> can be
used to stop a PMC-controlled spindle.
The spindle motor speed data is obtained from the following
expression. Its value can range from 0 to 4095:
Spindle motor speed data =
(Spindle motor speed/
Maximum spindle motor speed (parameter No. 4020))×4095
Remark)
Usually, the spindle speed must be controlled. If a gear train is
used to connect the spindle to the spindle motor, first obtain the
maximum spindle speed at the maximum spindle motor speed.
Spindle motor speed data =
(Spindle speed/Maximum spindle speed)×4095