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Vector control

5.14 Pole position identification

Drive functions

260 Function Manual, 11/2017, 6SL3097-4AB00-0BP5

Pole position correction with zero mark

When switching on for the first time, the pole position identification roughly synchronizes the

encoder angle to the pole position. After passing the zero mark, this coarse synchronization

is aligned assuming that the encoder supports commutation with zero mark (r0404.15 = 1).

The commutation angle must be available to do this (p0431). In order to utilize fine

synchronization for synchronous reluctance motors, the encoder must support commutation

with 180° (r0459.23 = 1).

Note

If an encoder with zero mark is used, then the converter can switch to a rotating motor as

soon as a valid zero mark position is available.

or synchronous reluctance motors, also when switching on the first time after the power

returns, the converter can be switched to a rotating motor

assuming that the "Flying restart"

function has been activated (p1200

= 1).

Replacing an encoder

If the encoder is replaced or retrofitted, the commutation angle offset must be determined

again (p1990 = 1), assuming that the encoder has position information (e.g. zero mark).

Checking the plausibility of the commutation angle

When using an absolute encoder, with the pole position identification, the plausibility of the

encoder commutation position can be checked (p1980 = 2). With this setting, each time that

the pulses are enabled, the encoder angle is checked. The determined angular difference

can be read out from parameter r1984. Fault F07413 is output if the deviation exceeds 45°.

If mechanical changes are carried out at the encoder, then using the encoder adjustment,

the commutation angle offset can be checked (p1990 = 2). The commutation angle offset is

determined, and the determined value is not accepted (p0431). Fault F07413 is output if the

deviation exceeds 6°.

Siemens SIROTEC Function Manual

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