Efficient Networks S120 Pole position determination with zero marks, Suitable zero marks are

Servo control

3.13 Pole position identification

WARNING

Before using the pole position identification routine, the control sense of the speed control loop must be corrected (p0410.0).

For linear motors, refer to the Commissioning Manual.

For rotating motors, in sensorless operation with a small positive speed setpoint (e.g. 10 RPM), the speed actual value (r0061) and the speed setpoint (r1438) must have the same sign.

CAUTION

If more than one 1FN3 linear motor is using saturation-based pole position identification for commutation (p1980 <= 4 and p1982 = 1), this can reduce accuracy when the commutation angle is determined. If a high level of accuracy is essential, (e.g. when p404.15 = 0 or the commutation angle offset is determined with p1990 = 1), the pole position identification runs should be carried out consecutively. This can be achieved by staggering the time at which the individual drives are enabled.

Pole position determination with zero marks

The pole position identification routine provides coarse synchronization. If zero marks exist, the pole position can be automatically compared with the zero mark position once the zero mark(s) have been passed (fine synchronization). The zero mark position must be either mechanically or electrically (p0431) calibrated. If the encoder system permits this, then we recommend fine synchronization (p0404.15 = 1). This is because it avoids measurement spread and allows the determined pole position to be additionally checked.

Suitable zero marks are:

●One zero mark in the complete traversing range

●Equidistant zero marks whose relevant position to the commutation are identical

●Distance-coded zero marks

100	Drive Functions
	Function Manual, (FH1), 07/2007 Edition, 6SL3097-2AB00-0BP4