6 – 466 HEIDENHAIN Technical Manual TNC 426, TNC 430
Maximum
revolutions per
minute
The maximum revolutions per minute in the motor data sheets are indicated
for a definite dc-link voltage. If you work with a lower dc-link voltage, the given
speed is not reached.
You can combat this effect and reach a higher speed on synchronous motors
by entering a field-angle offset:
7
77
7 In MP2340.x enter a speed from which the field angle is to be shifted. This
increases the current starting from the threshold speed. The thermal limit
curve is shifted.
7
77
7 In MP2350.x enter the maximum angle of the shift.
MP2340.0-8 Speed starting from which the field angle begins to shift on
synchronous motors for axes 1 to 9
Input: 0 to 100 000 rpm
0: No field angle offset
MP2350.0-8 Field-angle offset on synchronous motors for axes 1 to 9
Input: 0 to 60 [°]
Logic unit up to
Id. Nr. xxx xxx–3x:
The HEIDENHAIN and SIEMENS current controllers differ in their
characteristics. The maximum speed for synchronous motors attainable with
the TNC lies 15% below the value given in the SIEMENS data sheets. Please
take this into account when you choose motors. By entering a field-angle
offset you can reach the maximum speed specified in the SIEMENS data
sheet.
To do this, enter the following values:
n MP2340 = rated speed / 1.2
n MP2350 = 30°
Maximum revolutions per minute
Axis drives
TNC 426 PB/M
TNC 430 PA
Spindle drives
TNC 426 PB standard
TNC 426 M / 12 000
Spindle drives
TNC 426 PB option
TNC 426 M / 30 000
TNC 430 PA/M
24 000
No. of pole pairs
---------------------------------------------------- r p m
24 000
No. of pole pairs
---------------------------------------------------- r p m
60 000
No. of pole pairs
---------------------------------------------------- r p m
Note
Remember that with these data, starting from the threshold speed the
motors draw 16% more current than SIEMENS specifies. The thermal limit
curve is shifted.
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