User`s manual

232 • Vacon apfiff09 marine
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9. IDENTIFICATION FUNCTION FOR PERMANENT MAGNET SYNCHRONOUS MOTOR
PM Motor has several zero positioning identification modes. This chapter explains what kind of
identification mode is needed to select when using different kind of hardware configuration.
This chapter is addition to P2.1.9 Identification parameter description and P2.8.5.2 Start Angle
Identification mode description.
9.1 Zero position identification with absolute encoder.
When using absolute encoder identification is made only once. Remade is needed if encoder and
rotor position changes related to each other.
Motor needs to be able to rotate freely that magnet positions can be identified.
During identification drive feeds DC current to motor (~90 % of motor nominal), this causes motor to
move zero position, there may be oscillatory movement on the shaft. When identification is
cessful value is set to zero and
identification warning is displayed for 10 seconds (W57). If identification is made several times,
result may be different; there are as many positions as there are pole pairs in the motor.
Benefit to use absolute encoder is that magnet position is always known thus motor can be fully
loaded from the start.
Related parameters:
P2.1.9 Identification ID631
P2.8.5.1 PMSM Shaft Position ID649
9.2 Start position with incremental encoder without Z-pulse input.
When using incremental encoder without Z-pulse, no actual identification is made. But start angle is
find in every start.
In this case encoder identification cannot be done because zero position cannot be identified without
Z-
P2.8.5.1 PMSM Shaft Position
value is zero.
Best result is get when motor has a mechanical brake that prevents shaft movements. Acceptable
result can be achieved also when motor has high load and/or inertia that prevent shaft movements
during identification.
Angle identification is done in every start by feeding motor with a DC pulses that identifies magnet
position. DC pulses are in two different groups. First one identifies zero position and second one
Cu respectively.
NOTE: Not all motors are suitable for this identification mode. Functionality needs to be tested
before production use.
Benefit of this mode is that motor can be fully loaded from the start.
Related parameters:
P2.8.5.2 Start Angle Identification Mode ID1691
P2.8.5.1 PMSM Shaft Position ID649
P2.8.5.3 Start Angle Identification Current ID1759
P2.8.5.4 Polarity Pulse current ID1566