• p0505=3: US system of units
Torque [lbf ft], power [hp], temperature [°F]
• p0505=4: System of units, referred/US
Represented as [%]
Special features
The values for p0505=2 and for p0505=4 - represented in the converter - are identical.
However, the reference to SI or US units is required for internal calculations and to output
physical variables.
For variables, which cannot be represented as [%], then the following applies:
• p0505=1corresponds to settingp0505=2
• p0505=3corresponds to settingp0505=4
In the case of variables whose units are identical in the SI system and US system, and which
can be displayed as a percentage, the following applies:
• p0505=1corresponds to settingp0505=3
• p0505=2corresponds to settingp0505=4
Reference variables
There is a reference variable in the converter for most parameters with physical units. When the
referred representation [%] is set, then the converter scales the physical variables based on the
particular reference variable.
When the reference variable changes, then the signicance of the scaled value also changes.
Example:
• Reference speed = 1500rpm → xed speed=80% corresponds to the speed = 1200rpm
• Reference speed = 3000rpm → xed speed=80% corresponds to the speed = 2400rpm
For each parameter you can nd the associated reference variable for scaling in the
parameter list. Example: r0065 is scaled with reference variable p2000.
If scaling is not specied in the parameter list, then the converter always shows/displays the
parameter unscaled.
Groups of units
In the parameter list you will nd the following information for parameters with changeable
units:
• Unit group
Designates the group to which the parameter belongs
• Unit selection
Designates the parameter that changes over the unit
Example:
Unit group: 7_1, unit selection: p0505
Advanced commissioning
8.15Selecting physical units
SINAMICS G120C Converters
252 Operating Instructions, 02/2023, FW V4.7 SP14, A5E34263257B AK
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