Unit Changeover - Siemens SINAMICS G150 Operating Instructions Manual

9.2.16

Unit changeover

Description
Parameters and process variables for input and output can be switched to a suitable units
system (SI units, US units or referenced variables (%)) with the help of the unit changeover
function.
The following constraints apply to the unit changeover:
● Unit changeover is only possible for the "VECTOR" drive object.
● Parameters of the rating plate of the drive converter or the motor rating plate can be
● Once the changeover parameter has been changed, all parameters that are assigned to
● A separate parameter is available for selecting technological units (p0595) for the
● If a changeover is made to referenced variables and the reference variable is
Restrictions
● When a unit changeover occurs, rounding to the decimal places is carried out. This can
● If a referenced form is selected and the reference parameters (e.g. p2000) are changed
● If the reference variables (p2000 to p2007) are changed in the offline mode in STARTER,
Converter cabinet units
Operating Instructions, 03/2012, A5E03263466A
changed over between SI/US units; however, a per unit representation is not possible.
a unit group depending on this parameter are jointly changed over to the new unit.
representation of technological variables in the technology controller.
subsequently changed, the % value entered in a parameter will not change.
Example:
– With a reference speed of 1500 1/min, a fixed speed of 80 % corresponds to a value
of 1200 1/min.
– If the reference speed is changed to 3000 1/min, the value of 80 % is retained and is
now 2400 1/min.
mean that the original value might change by up to one decimal place.
retrospectively, the physical significance of some of the control parameters is also
adjusted, which can affect the control behavior.
there is a risk that the parameter value ranges will be violated. In this case, appropriate
fault messages will be displayed when the parameters are loaded to the drive unit.
Functions, Monitoring, and Protective Functions
9.2 Drive Functions
461