Unit Changeover - Siemens Sinamics G110M Original Instructions Manual

The inverter offers a series of functions that you can use depending on your particular
application, e.g.:
● Switching over units
● Braking functions
● Automatic restart and flying restart
● Basic process control functions
● Logical and arithmetic functions using function blocks that can be freely interconnected
● Calculating the energy saving for fluid flow machines
Refer to the following sections for detailed descriptions.
8.9.2

Unit changeover

Description
Using the unit switchover function, you can switch over parameters and process variables for
input and output to an appropriate system of units: US units, SI units or relative variables as
a %.
Independent of this, you can define the units for process variables or change over to
percentage values.
Specifically, you have the following options:
● Changing over the motor standard (Page 214) IEC/NEMA
● Changing over the unit system (Page 214)
● Changing over units for the technology controller (Page 215)
The motor standard, the unit system as well as the process variables can only be changed
offline.
Restrictions for the unit changeover function
● The values on the rating plate of the inverter or motor cannot be displayed as percentage
values.
● Using the unit changeover function several times (for example, percent → physical unit 1
→ physical unit 2 → percent) may lead to the original value being changed by one decimal
place as a result of rounding errors.
● If the unit is changed over into percent and the reference value is then changed, the
percentage values relate to the new reference value.
Example:
– For a reference speed of 1500 rpm, a fixed speed of 80% corresponds to a speed of
– If the reference speed is changed to 3000 rpm, then the value of 80% is kept and now
SINAMICS G110M Operating Instructions
Operating Instructions, 04/2015, FW V4.7.3, A5E31298649B AD
1200 rpm.
means 2400 rpm.
8.9 Application-specific functions
Functions
213