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

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Diagnostics
Example 1
An SSI encoder without incremental tracks is used. The encoder has a single turn resolution
of 16 bits and a multi turn resolution of 14 bits. The fine resolution p0418[x] and p0419[x] is
set to the value 2. In parameter r0482[x] (X_IST1), the product is formed from "pulses per
revolution" and fine resolution p0418[x]. If using SSI encoders without incremental tracks, the
number of pulses and single turn resolution are identical. In our example, the actual position
value X_IST1 (r0482[x]) must therefore have changed after an encoder resolution by the
value
single turn resolution * fine resolution = 2^16 * 2^2 = 262144
.
Example 2
An SSI encoder with incremental tracks is used. In this case, incorrect SSI protocol settings
can be seen, e.g. by the fact that once the system has been switched on a different absolute
position is indicated from that before it was last deactivated.
The absolute position X_IST2 (r0483[x]) must be considered by way of a check. Following
PROFIdrive, however, just one value is displayed in this parameter if bit 13 (request absolute
value in cycles) is set to the value 1 in the encoder control word p0480[x].
This bit can be set, e.g. with the aid of the binector-connector converter.
Once switched on, the SSI encoder is now turned a few revolutions. Once switched off and
on again, the absolute position of X_IST2 (r0483[x]) must indicate an unchanged value. Only
minor deviations may occur in the fine resolution area.
2.12

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

Description
As of FW2.5, a 2-pole (1 pole pair) resolver can be used as single-turn absolute encoder.
The absolute encoder actual position value is provided in Gn_Xist2 (r483[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). For this reason, there can be slight displacement of the
encoder position after switching the drive unit off/on.
Therefore, when using a 2-pole resolver as absolute encoder it is recommended that the fine
resolution for Gn_Xist1 (p418) be set to the same as the fine resolution for Gn_Xist2 (p419),
e.g. p418=p419=11
2-pole resolvers are automatically entered in the PROFIdrive profile (r979) as single-turn
absolute encoders.
Commissioning
Commissioning Manual, (IH1), 07/2007 Edition, 6SL3097-2AF00-0BP7
2.12 Notes on the commissioning of a 2-pole resolver as absolute encoder
Consequently, only a fine resolution of two bits can be set. Parameters p0418[x] and
p0419[x] in the list of experts should therefore be set to the value 2.
Commissioning
103

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