User`s manual

apfiff09 marine vacon • 165
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7.8.3 Permanent magnet synchronous motor settings
There are three ways to know the magnet positions when using the closed loop control. The first one
will identify the motor magnet position during every stat when using incremental encoder without Z-
pulse. Second one uses incremental encoder Z-pulse and the third one uses absolute encoder
P2.8.5.1 PMSM Shaft Position ID649
Absolute encoder position value corresponding to the shaft position where rotor magnet
axis is aligned with the stator U-phase magnet axis will be stored here as a result of the
encoder identification run. If incremental encoder with a z-pulse is used, z-pulse position
will be stored instead. Depending on the motor shaft mechanical position, this parameter
can have different values, as there is one right value for each pole-pair of the motor. If
incremental encoder and the z-pulse is utilized, the first start after power up is less
optimal and i/f-control (see 6.8.3.2) will be used until the drive finds the z-pulse and is
able to synchronize in that.
P2.8.5.2 Start Angle Identification Mode ID1691
Start angle, i.e. rotor magnet axis position in respect to the stator U-phase magnet axis,
identification is needed if there are no absolute encoder or incremental encoder with z-
pulse used. This function defines how the start angle identification is made in those
cases. Identification time depends on the motor electrical characteristics but takes
typically 50ms...200ms.
In case of absolute encoders, start angle will read directly from the encoder absolute
angle value. On the other hand, incremental encoder z-pulse will be used automatically
absolute encoders, P2.8.5.1 must be different from zero, otherwise it is interpreted that
the encoder identification run has not been done and the running will be prohibited
except if the absolute channel is bypassed by the start angle identification.
NOTE!
ModulatorType (P2.10.2) need to be > 0 to be able to use this function.
0 = Automatic
Decision to use start angle identification is made automatically based on the encoder
type connected to the drive. This will serve common cases.
Supports: OPT-A4, OPT-A5, OPT-A7 and OPT-AE boards.
1 = Forced
Bypasses the drive automatic logic and forces the start angle identification to be active.
Can be used, for example, with absolute encoders to bypass absolute channel
information and to use start angle identification instead.
2 = On Power UP
As a default, start angle identification will be repeated in every start if the identification is
active. This setting will enable identification only in a first start after drive is powered up.
In consecutive starts, angle will be updated based on the encoder pulse count.
10 = Disabled
Used when Z- pulse from encoder is used for start angle identification.