Vacon NX Series Applications Manual

Also see for NX series: User manual User manual Maintenance manual Operating guide Applications manual

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Vacon NX Series Applications Manual Manual pdf 164 page image

164 • Vacon apfiff09 marineTel. +35867.8.3 Permanent magnet synchronous motor settingsThere are three ways to know the magnet positions when using the closed loop control. The first onewill 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 encoderinformation. See detaP2.8.6.1 PMSM Shaft Position ID649Absolute encoder position value corresponding to the shaft position where rotor magnetaxis is aligned with the stator U-phase magnet axis will be stored here as a result of theencoder identification run. If incremental encoder with a z-pulse is used, z-pulse positionwill be stored instead. Depending on the motor shaft mechanical position, this parametercan have different values, as there is one right value for each pole-pair of the motor. Ifincremental encoder and the z-pulse is utilized, the first start after power up is lessoptimal and i/f-control (see 6.8.3.2) will be used until the drive finds the z-pulse and isable to synchronize in that.P2.8.6.2 Start Angle Identification ModeID1691Start 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 thosecases. Identification time depends on the motor electrical characteristics but takestypically 50ms...200ms.In case of absolute encoders, start angle will read directly from the encoder absoluteangle value. On the other hand, incremental encoder z-pulse will be used automaticallyabsolute encoders, P2.8.5.1 must be different from zero, otherwise it is interpreted thatthe encoder identification run has not been done and the running will be prohibitedexcept 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 = AutomaticDecision to use start angle identification is made automatically based on the encodertype connected to the drive. This will serve common cases.Supports: OPT-A4, OPT-A5, OPT-A7 and OPT-AE boards.1 = ForcedBypasses the drive automatic logic and forces the start angle identification to be active.Can be used, for example, with absolute encoders to bypass absolute channelinformation and to use start angle identification instead.2 = On Power UPAs a default, start angle identification will be repeated in every start if the identification isactive. 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 = DisabledUsed when Z- pulse from encoder is used for start angle identification.