Siemens SINAMICS S120 Commissioning Manual page 223

Parameterizing actual value processing
To parameterize the actual value processing, proceed as follows.
Requirements
• The motor used in the device configuration of the drive axis is completely specified and
configured.
Note
This basic parameterization cannot be performed without having completed this full
configuration.
Extrapolating position values
This parameter is displayed only for pure SSI encoders, namely, for encoders without HTL/TTL or
SIN/COS tracks. Because, compared with the speed controller cycle of the SINAMICS, the serial
transfer is relatively slow, the data can already be obsolete on arrival at the Sensor Module. If the
data transfer is not fast enough, you may need to switch to encoders with a faster data
transmission rate.
1. Activate "Extrapolate position values " in order to extrapolate the SSI data for the next speed
controller cycle.
– Advantage: The dead time between two speed controller cycles reduces and the closed-
– Disadvantage: For fluctuating speeds, the extrapolated value accuracy can vary.
2. Evaluate the advantages and disadvantages carefully.
3. Also check the deployed baud rate. A higher baud rate may allow a sufficiently fast data
transmission.
Inverting values
As the mounting direction of the encoder (at the right- or left-hand side) cannot be defined, but
depends on the specific motor being used (linear motor, torque motor, etc.), where appropriate,
invert the position and the speed in order to reverse the direction.
1. Select the "Actual speed value inverted" option (p0410.0)
2. Select the "Actual position value inverted" option (p0410.1)
Commissioning with Startdrive
Commissioning Manual, 06/2020, 6SL3097-5AA10-0BP2
loop controller becomes more dynamic.
5.7 Basic parameterization of the drive objects
Commissioning
221