Siemens CU240B-2 Parameter Manual page 250

Parameters
List of Parameters
p2000 Reference speed reference frequency / n_ref f_ref
Access level: 2
Can be changed: T
Units group: -
Min
6.00 [rpm]
Description: Sets the reference quantity for speed and frequency.
All speeds or frequencies specified as relative value are referred to this reference quantity.
The reference quantity in this parameter corresponds to 100% or 4000 hex or 4000 0000 hex.
The following applies: Reference frequency (in Hz) = reference speed (in ((rpm) / 60) x pole pair number).
Dependency: This parameter is only updated during the automatic calculation (p0340 = 1, p3900 > 0) if motor commissioning was
carried out beforehand for drive data set zero. This means that the parameter is not locked against overwriting
using p0573 = 1.
Refer to: p2001, p2002, p2003, r2004, r3996
Notice: When the reference speed / reference frequency is changed, short-term communication interruptions may occur.
Note: If a BICO interconnection is established between different physical quantities, then the particular reference quanti-
ties are used as internal conversion factor.
Example 1:
The signal of an analog input (e.g. r0755[0]) is connected to a speed setpoint (e.g. p1070[0]). The actual percent-
age input value is cyclically converted into the absolute speed setpoint using the reference speed (p2000).
Example 2:
The setpoint from PROFIBUS (r2050[1]) is connected to a speed setpoint (e.g. p1070[0]). The actual input value is
cyclically converted into a percentage value via the pre-specified scaling 4000 hex. This percentage value is con-
verted to the absolute speed setpoint via reference speed (p2000).
p2001 Reference voltage / Reference voltage
Access level: 3
Can be changed: T
Units group: -
Min
10 [Vrms]
Description: Sets the reference quantity for voltages.
All voltages specified as relative value are referred to this reference quantity. This also applies for direct voltage val-
ues (= rms value) like the DC-link voltage.
The reference quantity in this parameter corresponds to 100% or 4000 hex or 4000 0000 hex.
Dependency: p2001 is only updated during automatic calculation (p0340 = 1, p3900 > 0) if motor commissioning has been carried
out first for drive data set zero and as a result overwriting of the parameter has not been blocked by setting p0573 =
1.
Refer to: r3996
Notice: When the reference voltage is changed, short-term communication interruptions may occur.
Note: If a BICO interconnection is established between different physical quantities, then the particular reference quanti-
ties are used as internal conversion factor.
For infeed units, the parameterized device supply voltage (p0210) is pre-assigned as the reference quantity.
Example:
The actual value of the DC link voltage (r0070) is connected to a test socket (e.g. p0771[0]). The actual voltage
value is cyclically converted into a percentage of the reference voltage (p2001) and output according to the param-
eterized scaling.
1-250
Calculated: p0340 = 1
Scaling: -
Unit selection: -
Max
210000.00 [rpm]
Calculated: p0340 = 1
Scaling: -
Unit selection: -
Max
100000 [Vrms]
SINAMICS G120 / Control Units CU240B/E-2 Parameter Manual (LH11), 01/2011
Data type: FloatingPoint32
Data set: -
Factory setting
1500.00 [rpm]
Data type: FloatingPoint32
Data set: -
Factory setting
1000 [Vrms]
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