Siemens SINAMICS G120 Manual page 181

p1310[0...n] Voltage boost permanent / U_boost perm
Access level: 2
Can be changed: U, T
Units group: -
Min
0.0 [%]
Description: Defines the voltage boost as a [%] referred to the rated motor current (p0305).
The magnitude of the permanent voltage boost is reduced with increasing frequency so that at the rated motor fre-
quency, the rated motor voltage is present.
The magnitude of the boost in Volt at a frequency of zero is defined as follows:
Voltage boost [V] = 1.732 x p0305 (rated motor current [A]) x r0395 (stator/primary section resistance [ohm]) x
p1310 (permanent voltage boost [%]) / 100 %
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 current limit p0640 limits the boost.
For vector control, the permanent voltage boost (p1310) has no effect as the drive converter automatically sets the
optimum operating conditions.
Refer to: p1300, p1311, p1312, r1315
Notice: The voltage boost increases the motor temperature (particularly at zero speed).
Note: 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] Voltage boost at acceleration / U_boost accelerate
Access level: 2
Can be changed: U, T
Units 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:
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.
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
© Siemens AG 2011 All Rights Reserved
SINAMICS G120 Control Units CU230P-2 Parameter Manual (LH9), 01/2011
Calculated: -
Scaling: -
Unit selection: -
Max
250.0 [%]
Calculated: -
Scaling: -
Unit selection: -
Max
250.0 [%]
Parameters
List of Parameters
Data type: FloatingPoint32
Data set: DDS, p0180
Factory setting
50.0 [%]
Data type: FloatingPoint32
Data set: DDS, p0180
Factory setting
0.0 [%]
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