Unit Changeover - Siemens SINAMICS G120D Operating Instructions Manual

Advanced commissioning
7.8 Application-specific functions
7.8.2

Unit changeover

Description
With the unit changeover function, you can adapt the inverter to the line supply (50/60 Hz)
and also select US units or SI units as base units.
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 237) IEC/NEMA (adaptation to the line supply)
● Changing over the unit system (Page 238)
Note
The motor standard, the unit system as well as the process variables can only be
changed offline.
The procedure is described in Section Switching units with STARTER (Page 238).
Note
Restrictions for the unit changeover function
• The values on the rating plate of the inverter or motor cannot be displayed as
• Using the unit changeover function a multiple times (for example, percent → physical
• If the unit is changed over into percent and the reference value is then changed, the
Reference variables for unit changeover
p2000 Reference frequency/speed
p2001 Reference voltage
p2002 Reference current
p2003 Reference torque
r2004 Reference power
p2005 Reference angle
p2006 Reference temperature
p2007 Reference acceleration
236
percentage values.
unit 1 → physical unit 2 → percent) may lead to the original value being changed by
one decimal place as a result of rounding errors.
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 1200 rpm.
– If the reference speed is changed to 3000 rpm, then the value of 80% is kept and
now means 2400 rpm.
Converter with control units CU250D-2
Operating Instructions, 04/2015, FW V4.7.3, A5E34261542B AB