Speed Encoder Of The Spindle - HEIDENHAIN iTNC 530 Technical Manual

6.12.2 Speed Encoder of the Spindle

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Digital speed control requires a shaft speed encoder:
7 Define the speed encoder input in MP113.x.
The iTNC 530 monitors the reference mark of the speed encoder. The monitor
checks whether the line count for one revolution from reference mark to
reference mark is equal to the line-count entry in the motor table.
If differences occur, the DSP error message C3A0 Incorrect reference
-position S appears. If this happens, check the speed encoder, encoder
cable, and whether you have selected the correct motor.
With a gear wheel encoder, even if it is properly installed, monitoring can
result in this error message due to its inherent inaccuracy:
7 In this case, switch the monitoring off with MP2220 bit 0 = 1.
The iTNC 530 monitors the direction of rotation. If the nominal value of current
exceeds the limit value for a certain time, the DSP error message C380 Motor
<spindle 1/2, axis> not controllable appears.
At lower speeds, high-frequency spindles only have a low amount of torque.
If such a spindle is having its speeds controlled, the tool changer may slightly
twist the spindle, causing the limit of current to be exceeded. This leads to the
above error message:
7
In this case, switch the monitoring off with MP2221 bit 1 = 1.
Warning
For axes, the monitoring for the rotational direction (MP2220 Bit1) must not
be deactivated. An error (e.g. one motor phase interchanged with another
or incorrect entry in the DIR column of the motor table) might cause
uncontrolled acceleration of the motor in one direction if the monitoring
function for the rotational direction is deactivated.
This also applies to spindles. For spindles, however, an incorrect
acceleration in one direction is less dangerous than for axes.
MP113 Speed encoder for the spindle/spindles
Input: 0: No speed encoder
15 to 20: Speed encoder inputs X15 to X20
80 to 83: Speed encoder inputs X80 to X83
MP113.0 Speed encoder for the first spindle
MP113.1 Speed encoder for the second spindle
MP2220.x Monitoring functions
Input: %xxx
Bit 0 – Monitoring the reference mark
0: Monitoring active
1: Monitoring inactive
Bit 1 – Monitoring the rotational direction
0: Monitoring active
1: Monitoring inactive
HEIDENHAIN Technical Manual iTNC 530