User`s manual

166 • Vacon apfiff09 marine

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P2.8.5.3 Start Angle Identification Current ID1759

This parameter defines the current level that is used in start angle identification. The

correct level depends of the motor type used. In general, 50% of motor nominal current

seems to sufficient, but depending for example on the motor saturation level, higher

current might be needed.

P2.8.5.4 Polarity Pulse Current ID1566

This parameters defines the current level for the magnet axis polarity direction check

during the start angle identification (P2.8.5.2). Value 0 means that the internal current

level is used, which is typically slightly higher than the normal identification current

defined by P2.8.5.3. Polarity direction check is seldom needed because the identification

itself gives already the right direction. Hence in most cases, this function can disabled by

setting any negative parameter value, which is recommended especially if there occurs

F1 faults during the identification.

P2.8.5.5 Start Angle Identification Time ID1755

Start angle can be determined also by feeding dc-current into the motor. Then dc-

current will align the rotor magnet axis with the stator magnet axis. This function is

activated by determining the time duration dc-current is injected to the motor. Motor

must be free to move during the alingment and the time need to be long enough for shaft

oscillations to damp out. Hence, this method is not so pracatical and is intednded to be

used mainly for testing purposes or to improve starting in together with i/f-control. Dc-

current level is determined by P2.8.5.6. Also P2.8.5.2 need to disabled otherwise

overriding this function.