6 – 506 HEIDENHAIN Technical Manual TNC 426, TNC 430
6.24.4 Digital Spindle for TNC 426 without Spindle DSP
Temporary input
values
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7 Enter the following temporary input values when you begin:
Adjust the current
controller
Same procedure as for digital axes, with one exception:
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7 You must adjust MP2401 instead of MP2400.x.
Speed controller Define the step function:
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7 In MP3411.x, enter the maximum acceleration and start the step by
switching the spindle on.
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7 Set the following machine parameters:
• MP2501 = 2: Proportional factor of the speed controller
• MP2511 = 1: Integral factor of the speed controller
• MP2521 = 0: Differential factor of the speed controller
• MP2531 = 0: PT
2
element of the speed controller
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7 Activate a spindle speed from the highest gear range.
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7 With the integrated oscilloscope, record the nominal velocity value
V (NOM RPM), the actual speed value V (ACT RPM), and the nominal
current value (I NOMINAL).
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7 Output a step by activating the spindle-on function (M03/M04).
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7 Choose the height of the step function for a very low speed so as not to
overload the speed controller, i.e. so that I NOMINAL is not limited.
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7 Increase the P factor (MP2501) until the system oscillates or no change is
visible.
MP Temporary input
value
Meaning
MP3010.x 3 to 8 Output of speed, gear range
MP3020 991 Speed range
MP3411.x 1.999 Ramp gradient
MP3412.x 1 Multiplier for MP3411.x
MP3415.x 0 Overshoot behavior
MP3420 1 Positioning window
MP3440.x 1 k
v
factor
Note
C axis operation must be deselected for commissioning, meaning that no
identical PWM outputs may be entered in MP120.x and in MP121.x.
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