Siemens SINAMICS G120 List Manual page 236

2 Parameters
2.2 List of parameters
At low output frequencies, there is only a low output voltage in order to maintain the motor flux. However, the output
voltage can be too low in order to achieve the following:
- magnetize the induction motor.
- hold the load.
- compensate for losses in the system.
This is the reason that the output voltage can be increased using p1310.
The voltage boost can be used for both linear as well as square-law U/f characteristics.
Dependency: The starting current (voltage boost) is limited by the current limit p0640.
Only for p1302.4 = 0 (no field orientation):
The accuracy of the starting current depends on the setting of the stator and feeder cable resistance (p0350, p0352).
For vector control, the starting current is realized using p1610.
Not visible with application class: "Dynamic Drive Control" (DDC, p0096 = 2)
Refer to: p1300, p1311, p1312, r1315
Notice: The starting current (voltage boost) increases the motor temperature (particularly at zero speed).
Note: The starting current as a result of the voltage boost is only effective for U/f control (p1300).
The boost values are combined with one another if the permanent voltage boost (p1310) is used in conjunction with
other boost parameters (acceleration boost (p1311), voltage boost for starting (p1312)).
However, these parameters are assigned the following priorities: p1310 > p1311, p1312
p1311[0...n] Starting current (voltage boost) when accelerating / I_start accel
PM240 Access level: 2
Can be changed: U, T
Unit group: -
Min
0.0 [%]
Description: p1311 only results in a voltage boost when accelerating and generates a supplementary torque to accelerate the
load.
The voltage boost becomes effective for a positive setpoint increase and disappears as soon as the setpoint has
been reached. The build-up and withdrawal of the voltage boost are smoothed.
The magnitude of the boost in Volt at a frequency of zero is defined as follows (not for field orientation):
Voltage boost [V] = 1.732 * p0305 (rated motor current [A]) x r0395 (stator/primary section resistance [ohm]) x p1311
(voltage boost when accelerating [%]) / 100 %
Dependency: The current limit p0640 limits the boost.
For field orientation (p1302 bit 4 = 1, not PM230, PM250, PM260), p1311 is pre-assigned by the automatic
calculation.
For vector control, the starting current is realized using p1611.
Not visible with application class: "Dynamic Drive Control" (DDC, p0096 = 2)
Refer to: p1300, p1310, p1312, r1315
Notice: The voltage boost results in a higher motor temperature increase.
Note: The voltage boost when accelerating can improve the response to small, positive setpoint changes.
Assigning priorities for the voltage boosts: refer to p1310
For field orientation (p1302 bit 4 = 1, not PM230, PM250, PM260), then p1311 together with p1310 and p1302.5 are
mainly responsible for the quality of the drive response.
p1311[0...n] Starting current (voltage boost) when accelerating / I_start accel
PM250 Access level: 2
PM260
Can be changed: U, T
Unit group: -
Min
0.0 [%]
Description: p1311 only results in a voltage boost when accelerating and generates a supplementary torque to accelerate the
load.
The voltage boost becomes effective for a positive setpoint increase and disappears as soon as the setpoint has
been reached. The build-up and withdrawal of the voltage boost are smoothed.
236
Calculated: -
Scaling: -
Unit selection: -
Max
250.0 [%]
Calculated: -
Scaling: -
Unit selection: -
Max
250.0 [%]
Data type: FloatingPoint32
Dyn. index: DDS, p0180
Func. diagram: 6300, 6301, 6851
Factory setting
0.0 [%]
Data type: FloatingPoint32
Dyn. index: DDS, p0180
Func. diagram: 6300, 6301
Factory setting
0.0 [%]
SINAMICS G120 CU250S-2 Control Units
List Manual, 09/2017, A5E33842890