Notes On The Commissioning Of A 2-Pole Resolver As Absolute Encoder - Siemens SINAMICS S120 Commissioning Manual

Commissioning

2.15 Notes on the commissioning of a 2-pole resolver as absolute encoder

2.15 Notes on the commissioning of a 2-pole resolver as absolute
encoder
Description
You can use 2-pole (1 pole pair) resolvers as singleturn absolute encoders. The absolute
encoder position actual value is provided in Gn_XIST2 (r0483[x]).
Actual position value format
The factory setting for the fine resolution of Gn_XIST1 differs from the fine resolution in
Gn_XIST2 (p0418 = 11, p0419 = 9). This may cause a slight displacement of the encoder
position after switching the drive unit off/on.
Therefore, when using a 2-pole resolver as an absolute encoder, we recommend that the
fine resolution for Gn_XIST1 (p0418) is set the same as the fine resolution for Gn_XIST2
(p0419), e.g. p0418 = p0419 =11.
2-pole resolvers are automatically entered in the PROFIdrive profile (r0979) as singleturn
absolute encoders.
Position tracking
You can also activate position tracking for a 2-pole resolver. Please note, however, that the
resolver may not be moved more than half an encoder revolution (pole width) when switched
off. The activation and configuration of the position tracking is described in the chapter
"Position tracking".
EPOS - absolute encoder adjustment
If the 2-pole resolver is used as an absolute encoder for basic positioning (EPOS), the
absolute encoder adjustment must be performed:
● via STARTER (Basic positioner → Referencing) or
● via the expert list.
To do this, set reference point coordinate p2599 to the value corresponding to the
mechanical system and request the adjustment with p2507 = 2.
You will then need to back up the data from RAM to ROM.
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Commissioning Manual, (IH1), 01/2011, 6SL3097-4AF00-0BP1
Commissioning Manual