1114 HEIDENHAIN Technical Manual iTNC 530 HSCI
Determining the
field angle
There are three methods for determining the field angle without motor
motion:
Method 2: Current pulses are output with the brakes applied, and the
absolute rotor position is determined from the reaction. A "minimum"
movement of the motor must be possible when the brakes are applied.
Method 3: Method 3 functions in the same manner as Method 2, but with
the difference that the motor brakes are not applied. Therefore, this method
is not suitable for hanging axes. However, this method can lead to more
exact results than Method 2, so it should be used for synchronous spindles.
Minimal spindle movements can occur during field angle determination.
Method 4: This new method was introduced for determining the field angle
so that the relationship between the position of the incremental encoder
and the position of the rotor magnets can be established even if there is
considerable noise in the encoder signals.
In MP2250.x, select the method to be used for determining the absolute
rotor position.
MP2250.x Determining the field angle without motor motion
Input: 0: Same as input value 2
1: Reserved
2: Method 2 (brakes applied)
3: Method 3 (same as Method 2, but motor brake is not applied)
4: Method 4 (if there is a lot of noise in the encoder signals)
MP2252.x Reserved
Input: Enter 0
Standstill monitoring is active while determining the field angle. If it
responds for motors without motor brakes, increase the threshold in
MP1110.x. Afterwards, reset MP1110.x to the original value.
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