Indramat TDA 1 - Page 10

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• DOK-DIAX01-TDA********-PRJ1-EN-E1,44 • 07.97
The TDA 1 operates in conjunction with other controllers for feed axes.
A combination of power supply module, modular main spindle and servo
drive controllers permits individual matching of the drive to the task of a
CNC machine tool.
Fig. 3: Drive package with modular main spindle controller TDA 1
Power supply
module
TDA 1 Servo drive controllers
The a.c. main spindle drive with TDA 1 is also capable of operating the
spindle as a servo axis (C-axis) with a high-accuracy position control
loop. The main spindle motor is fitted with a high-resolution motor
feedback device to cope with the low speeds required in this application.
The controller detects the rotor position with a maximum resolution of 1/
2 000 000 revolutions, thus allowing even the lowest speeds to be
precisely controlled.
Since the spindle operates as an interpolating axis in C-axis mode and
the NC controls require information on the spindle position, the TDA 1
supplies compatible position signals for incremental encoders through
an optional output. The increments are derived either from the high-
resolution motor feedback device or from an additional, optional spindle
feedback device. The spindle feedback, in the latter case, is a high-
resolution main spindle position encoder from INDRAMAT. It is mounted
directly onto the spindle. The definition of the incremental encoder output
is selectable and provides a maximum resolution of 360 000 increments/
revolution in C-axis mode.
1. Presentation of the modular main spindle controller TDA 1
C-axis mode
Controller for modular
drive package
Incremental encoder output