Siemens SINAMICS G110D Operating Instructions Manual page 119

Table 6- 30
Parameters
P0003 = 2
P1310 = ...
P1311 = ...
P1312 = ...
Additional information about this function is provided in the parameter list and in the function
diagram 6100 in the List Manual.
SINAMICS G110D
Operating Instructions, 07/2016, FW V3.63, A5E36768472B AB
Optimizing the starting characteristics for a linear characteristic
Description
Extended access
Continuous Boost
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 follow-
ing:
magnetisation the asynchronous motor
•
hold the load
•
overcome losses in the system.
•
The inverter output voltage can be increased via P1310 for the compensation of loss-
es, 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 = sqrt(3) * P0305 * P0350 * (P1310/100)
Increasing the boost levels increases motor heating (especially at standstill). Setting in
P0640 (motor overload factor [%]) limits the boost:
sum(V_Boost) / (P0305 * P0350) <= 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) <= 1.3 * sqrt(3) * P0305 * P0350 * (P0640/100)
Acceleration boost
Applies boost in [%] relative to P0305 (rated motor current) following a positive set-
point change and drops back out once the setpoint is reached. P1311 will only pro-
duce boost during ramping, and is therefore useful for additional torque during
acceleration and deceleration. As opposed to parameter P1312, which is only active
on the first acceleration issued after the ON command, parameter 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 = sqrt(3) * P0305 * P0350 * (P1311/100)
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 = sqrt(3) * P0305 * P0350 * (P1312/100)
Functions
6.7 Motor control
119