Internal Position Control (Ipos); Setting Mechanical System - Siemens SINAMICS V90 Operating Instructions Manual

Note
When using the PTO function, the drive will output some pulses before the motor servo on if
you executing the following operations.
• Default the drive with the BOP instruction.
• Configure the motor ID on the drive.
Note
When you use the PTO electronic gear ratio function, zero mark will not be generated.
PTO zero mark
Make the servo motor rotate for more than one revolution before using PTO's zero mark for
referencing.
7.4

Internal position control (IPos)

7.4.1

Setting mechanical system

By parameterizing the mechanical system, the link between the physical moving part and the
length unit (LU) is established.
The unit of the fixed position setpoint is the Length Unit (LU). All subsequent position
setpoint, related speed value, and acceleration value will maintain the LU as the unit in
internal position control mode.
Taking a ball screw system for example, if the system has a pitch of 10 mm/revolution
(10000 µm/revolution) and the resolution of the length unit is 1 µm (1 LU = 1 µm), one load
revolution corresponds to 10000 LU (p29247 = 10000).
Note
If the value of p29247 increases by N times, the values of p2542, p2544 and p2546 should
increase by N times accordingly. Otherwise, the fault F7450 or F7452 occur.
SINAMICS V90, SIMOTICS S-1FL6
Operating Instructions, 09/2015, A5E36037884
Control functions
7.4 Internal position control (IPos)
185