Parameter list
7.2 Parameter list
SINAMICS V20 Inverter
Operating Instructions, 07/2012, A5E03728167
179
Parameter Function Range Factory
default
Can be
changed
Scaling Data
set
Data
type
Acc.
Level
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
parameters (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 [%] 0.0 - 250.0 0.0 U, T PERCEN
T
DDS Float 2
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
acceleration 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)
Note:
Rsadj = stator resistance adjusted for temperature
Rsadj = (r0395 / 100) * (P0304 / (sqrt(3) * P0305)) * P0305 * sqrt(3)
Note: See P1310
P1312[0...2] Starting boost [%] 0.0 - 250.0 0.0 U, T PERCEN
T
DDS Float 2
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)
Note:
Rsadj = stator resistance adjusted for temperature
Rsadj = (r0395 / 100) * (P0304 / (sqrt(3) * P0305)) * P0305 * sqrt(3)
Note: See P1310
r1315 CO: Total boost voltage
[V]
- - - - - Float 4
Displays total value of voltage boost.
P1316[0...2] Boost end frequency [%] 0.0 - 100.0 20.0 U, T PERCEN
T
DDS Float 3
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.
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