Siemens SINAMICS G120D Operating Instructions Manual page 176

Advanced commissioning
8.11 Selecting physical units
• 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 = 1 corresponds to setting p0505 = 2
• p0505 = 3 corresponds to setting p0505 = 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 = 1 corresponds to setting p0505 = 3
• p0505 = 2 corresponds to setting p0505 = 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 significance of the scaled value also changes.
Example:
• Reference speed = 1500 rpm → fixed speed = 80 % corresponds to the speed = 1200 rpm
• Reference speed = 3000 rpm → fixed speed = 80 % corresponds to the speed = 2400 rpm
For each parameter you can find the associated reference variable for scaling in the parameter
list. Example: r0065 is scaled with reference variable p2000.
If scaling is not specified in the parameter list, then the converter always shows/displays the
parameter unscaled.
Groups of units
In the parameter list you will find 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
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Converter with the control units CU240D-2
Operating Instructions, 10/2020, FW V4.7 SP13, A5E34262100B AH