Siemens SINAMICS V20 Operating Instructions Manual page 218

Parameter list
7.2 Parameter list
Parameter Function
Defines boost level in [%] relative to P0305 (rated motor current) applicable to both linear and quadratic V/f
curves.
At low output frequencies the output voltage is low to keep the flux level constant. However, the output
voltage may be too low for the following:
magnetization the asynchronous motor
•
hold the load
•
overcome losses in the system.
•
The inverter output voltage can be increased via P1310 for the compensation of losses, hold loads at 0 Hz
or maintain the magnetization.
The magnitude of the boost in Volt at a frequency of zero is defined as follows:
V_ConBoost,100 = P0305 * Rsadj * (P1310 / 100)
Where:
Rsadj = stator resistance adjusted for temperature
Rsadj = (r0395 / 100) * (P0304 / (sqrt(3) * P0305)) * P0305 * sqrt(3)
Note: Increasing the boost levels increases motor heating (especially at standstill).
Setting in P0640 (motor overload factor [%]) limits the boost:
sum(V_Boost) / (P0305 * Rsadj) <= P1310 / 100
The boost values are combined when continuous boost (P1310) used in conjunction with other boost pa-
rameters (acceleration boost P1311 and starting boost P1312). However priorities are allocated to these
parameters as follows:
P1310 > P1311 > P1312
The total boost is limited by following equation:
sum(V_Boost) <= 3 * R_S * I_Mot = 3 * P0305 * Rsadj
P1311[0...2] Acceleration boost [%]
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 [%]
218
Range Factory Can be
default changed
0.0 - 250.0 0.0 U, T
0.0 - 250.0 0.0 U, T
Scaling Data Data
set type
PERCEN DDS Float
T
PERCEN DDS Float
T
SINAMICS V20 Inverter
Operating Instructions, 09/2014, A5E34559884
Acc.
Level
2
2