Higher Current Gain Beginning With The Reated Speed - HEIDENHAIN TNC 426 PB/M Technical Manual

Higher current gain
beginning with the
rated speed
December 2001
The counter EMF increases with increasing shaft speed. Therefore a higher
current gain is needed at higher shaft speeds:
7 7 7 7
With the integrated oscilloscope, record V (ACT RPM) and activate a shaft
speed greater than the rated speed.
• If V (ACT RPM) "pumps" only at high shaft speeds, increase MP2403 until
the spindle runs quietly.
• If V (ACT RPM) oscillates even at low shaft speeds, the problem lies with
resonance oscillations: You can compensate these oscillations in the
same way as for the axes, i.e., with the differential factor, low-pass filter
or the PT element.
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Commissioning 6 – 511