Siemens SINAMICS G120 List Manual page 161

p1081 Maximum speed scaling / n_max scal
Access level: 2
Can be changed: U, T
Unit group: -
Min
100.00 [%]
Description: Sets the scaling for the maximum speed (p1082).
For a higher-level speed control, this scaling allows the maximum speed to be briefly exceeded.
Dependency: Refer to: p1082
Notice: Continuous operation above a scaling of 100 % is not permitted.
p1082[0...n] Maximum speed / n_max
Access level: 1
Can be changed: C(1), T
Unit group: 3_1
Min
0.000 [rpm]
Description: Sets the highest possible speed.
Example:
Induction motor p0310 = 50 / 60 Hz without output filter and Blocksize power unit
p1082 <= 60 x 240 Hz / r0313 (vector control)
p1082 <= 60 x 550 Hz / r0313 (U/f control)
Dependency: For vector control, the maximum speed is restricted to 60.0 / (8.333 x 500 µs x r0313). This can be identified by a
reduction in r1084. p1082 is not changed in this process due to the fact that the operating mode p1300 can be
changed over.
If a sine-wave filter (p0230 = 3) is parameterized as output filter, then the maximum speed is limited corresponding to
the maximum permissible filter output frequency (refer to the filter data sheet). When using sine-wave filters (p0230 =
3, 4), the maximum speed r1084 is limited to 70% of the resonant frequency of the filter capacitance and the motor
leakage inductance.
For reactors and dU/dt filters, it is limited to 120 Hz / r0313.
Refer to: p0230, r0313, p0322
Notice: After the value has been modified, no further parameter modifications can be made and the status is shown in r3996.
Modifications can be made again when r3996 = 0.
Note: The parameter applies for both motor directions.
The parameter has a limiting effect and is the reference quantity for all ramp-up and ramp-down times (e.g. down
ramps, ramp-function generator, motor potentiometer).
The parameter is part of the quick commissioning (p0010 = 1); this means that it is appropriately pre-assigned when
changing p0310, p0311, p0322.
The following limits are always effective for p1082:
p1082 <= 60 x minimum (15 x r0310, 550 Hz) / r0313
p1082 <= 60 x maximum power unit pulse frequency / (k x r0313), with k = 12 (vector control), k = 6.5 (U/f control)
During automatic calculation (p0340 = 1, p3900 > 0), the parameter value is assigned the maximum motor speed
(p0322). For p0322 = 0 the rated motor speed (p0311) is used as default (pre-assignment) value. For induction
motors, the synchronous no-load speed is used as the default value (p0310 x 60 / r0313).
For synchronous motors, the following additionally applies:
During automatic calculation (p0340, p3900), p1082 is limited to speeds where the EMF does not exceed the DC link
voltage.
p1082 is also available in the quick commissioning (p0010 = 1); this means that when exiting via p3900 > 0, the value
is not changed.
SINAMICS G120 Control Units CU240B-2/CU240E-2
List Manual (LH11), 01/2016, A5E33839529
Calculated: -
Scaling: PERCENT
Unit selection: -
Max
105.00 [%]
Calculated: p0340 = 1
Scaling: -
Unit selection: p0505
Max
210000.000 [rpm]
2 Parameters
2.2 List of parameters
Data type: FloatingPoint32
Dyn. index: -
Func. diagram: 3050, 3095
Factory setting
100.00 [%]
Data type: FloatingPoint32
Dyn. index: DDS, p0180
Func. diagram: 3020, 3050, 3060,
3070
Factory setting
1500.000 [rpm]
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