Changing Over Units - Siemens SINAMICS S120 Function Manual

4.28

Changing over units

Description
By changing over the units, parameters and process quantities for input and output
can be changed over to an appropriate system of units (US units or as per unit
quantities (%)).
The following supplementary conditions apply when changing over units:
S Parameters of the type plate of the drive converter or the motor rating plate can
be changed over between SI/US units; however, a per unit representation is not
possible.
S After changing over the units parameter, all parameters that are assigned to
one of the units group dependent on it, are all changed over to the new system
of units.
S A parameter is available to select technological units (p0595) to represent
technological quantities in the technology controller.
S If the units are changed over to per unit quantities and the reference quantity
changed, then the percentage value entered in a parameter is not changed.
Example:
– A fixed speed of 80 % corresponds, for a reference speed of 1500 RPM, to
a value of 1200 RPM.
– If the reference speed is changed to 3000 RPM, then the value of 80 % is
kept and now means 2400 RPM.
Groups of units
Every parameter that can be changed over is assigned to a units group, that, de-
pending on the group, can be changed over within certain limits.
This assignment for each parameter can be seen in the parameter list in the List
Manual.
Table 4-12 Groups of units: Changeover using p0100, can be changed over for p0010 = 1
Changeover group
14_2
14_6
© Siemens AG 2006 All Rights Reserved
SINAMICS S120 Function Manual, 03/2006 Edition
Units for p0100 =
0
W
kW
1
HP
HP
Extended Functions
Changing over units
Reference quantity for %
–
–
4-295