Siemens SINAMICS V20 Operating Instructions Manual page 255

Parameter Function
P1311[0...2] Acceleration boost [%] 0.0 - 250.0
Applies boost in [%] relative to P0305 (rated motor current) following a positive setpoint change and drops
back out once the setpoint is reached.
P1311 will only produce boost during ramping, and is therefore useful for additional torque during accelera-
tion and deceleration.
As opposed to P1312, which is only active on the first acceleration issued after the ON command, P1311 is
always effect during an acceleration and deceleration when issued.
The magnitude of the boost in volt at a frequency of zero is defined as follows:
V_AccBoost,100 = P0305 * Rsadj * (P1311 / 100)
Where:
Rsadj = stator resistance adjusted for temperature
Rsadj = (r0395 / 100) * (P0304 / (sqrt(3) * P0305)) * P0305 * sqrt(3)
Note: See P1310
P1312[0...2] Starting boost [%]
Applies a constant linear offset (in [%] relative to P0305 (rated motor current)) to active V/f curve (either
linear or quadratic) after an ON command and is active until:
1. ramp output reaches setpoint for the first time respectively
2. setpoint is reduced to less than present ramp output
This is useful for starting loads with high inertia. Setting the starting boost (P1312) too high will cause the
inverter to limit the current, which will in turn restrict the output frequency to below the setpoint frequency.
The magnitude of the boost in volt at a frequency of zero is defined as follows:
V_StartBoost,100 = P0305 * Rsadj * (P1312 / 100)
Where:
Rsadj = stator resistance adjusted for temperature
Rsadj = (r0395 / 100) * (P0304 / (sqrt(3) * P0305)) * P0305 * sqrt(3)
Note: See P1310
r1315 CO: Total boost volt-
age [V]
Displays total value of voltage boost.
P1316[0...2] Boost end frequency
[%]
Defines point at which programmed boost reaches 50 % of its value. This value is expressed in [%] relative
to P0310 (rated motor frequency). The default frequency is defined as follows:
V_Boost,min = 2 * (3 + (153 / sqrt(P_Motor))
Dependency: This parameter is influenced by automatic calculations defined by P0340.
Note: The expert user may change this value to alter the shape of the curve, e.g. to increase torque at a particular
frequency.
Default value is depending on inverter type and its rating data.
P1320[0...2] Programmable V/f
freq. coord. 1 [Hz]
Sets the frequency of the first point of V/f coordinates (P1320 / 1321 to P1324 / 1325) to define V/f charac-
teristic. These parameter pairs can be used to provide correct torque at correct frequency.
Dependency: To set parameter, select P1300 = 3 (V/f with programmable characteristic). The acceleration boost and
starting boost defined in P1311 and P1312 are applied to V/f with programmable characteristic.
SINAMICS V20 Inverter
Operating Instructions, 11/2016, A5E34559884-006
Range Factory
default
0.0
0.0 - 250.0 0.0
- -
0.0 - 100.0 20.0
0.00 - 550.00 0.00
Can be Scaling
changed
U, T PERCENT
U, T PERCENT
- -
U, T PERCENT
T -
Parameter list
8.2 Parameter list
Data Data Acc.
set type Level
DDS Float 2
DDS Float 2
- Float 4
DDS Float 3
DDS Float 3
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