Position Encoder Of The Spindle - HEIDENHAIN iTNC 530 Technical Manual

6.12 Spindle

6.12.1 Position Encoder of the Spindle

February 2002
Two spindles can be controlled alternately (See page 6 – 206).
The main spindle/spindles are controlled with the PLC.
The programmed speed can be output as
n
Code via PLC outputs
n
Analog nominal speed command signal for an analog spindle
n
Digital nominal speed value for a digital spindle
The spindle functions are of varying priorities. If several functions are output
at the same time, the function with the highest priority is run, and the rest are
deleted. The following spindle function priorities are valid:
1. Oriented spindle stop
2. Spindle jog
3. M3/M4
4. M5
7
Specify in MP3010 the speed output for the spindle.
MP3010 Output of speed, gear range
Input: 0: No output of spindle speed
1: Speed code, if the speed changes
2: Speed code at every TOOL CALL
3: Nominal speed value always, G code if the gear shifts
4: Nominal speed value always, G code at every TOOL CALL
5: Nominal speed value always, no G code
6: Same as 3, but with servo-controlled spindle for oriented
spindle stop
7: Same as 4, but with servo-controlled spindle for oriented
spindle stop
8: Same as 5, but with servo-controlled spindle for oriented
spindle stop
Analog and digital spindles can be driven in a closed control loop. In this case
the spindle needs its own position encoder:
7 Define the position encoder input in MP111.x.
• If you have a digital spindle and would like to use the speed encoder also
as a position encoder, then you must set MP111.x = 0.
7 Enter in MP3142 the line count of the rotary encoder to be used. 1-V
signals undergo 1024-fold subdivision.
7 Enter in MP3142 the type of mounting of the position encoder on the
spindle. Due to the higher required accuracy, the position encoder must be
mounted directly on the spindle, MP3143 = 0
If design considerations make this impossible:
7
Define the encoder-to-spindle transmission ratio in MP3450.x and
MP3451.x for each gear stage.
In this case there will be several reference pulses per revolution.
7
Evaluate the reference mark with Module 9220. See "Renewed traversing
of the reference marks" on page 6 – 103
Spindle
PP
6 – 179