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SINAMICS G120C
List Manual (LH13), 04/2014, A5E33840768B AA
143
2 Parameters
2.2 List of parameters
Re bit 05 (only effective for p1302.4 = 1):
The starting current when accelerating (p1311) generally results in an increase in the absolute current and flux. With
p1302.5 = 1 the current is only increased in the direction of the load. This setting is recommended for drives with
higher power ratings or drives with extremely fast rates of acceleration.
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
frequency, 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.
Not for power units PM230, PM250, PM260:
For field orientation (p1302.4 = 1, default setting for p0096 = 1), in the vicinity of low output frequencies, a minimum
current is impressed with the magnitude of the rated magnetizing current.
For p1310 = 0%, a current setpoint is calculated that corresponds to the no-load case. For p1610 = 100 %, a current
setpoint is calculated that corresponds to the rated motor current.
Dependency: The starting current (voltage boost) is limited by the current limit p0640.
The accuracy of the starting current depends on the setting of the stator and feeder cable resistance (p0350, p0352).
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
For field orientation (p1302.4 = 1, not PM230, PM250, PM260), p1311 and p1312 of the voltage boost are also added
in the direction of the load current (non-linear).
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 %
p1310[0...n] Starting current (voltage boost) permanent / I_start (Ua) perm
Access level: 2 Calculated: p0340 = 1 Data type: FloatingPoint32
Can be changed: U, T Scaling: - Dyn. index: DDS, p0180
Units group: - Unit selection: - Func. diagram: 6300, 6301
Min Max Factory setting
0.0 [%] 250.0 [%] 50.0 [%]
p1311[0...n] Starting current (voltage boost) when accelerating / I_start accel
Access level: 2 Calculated: - Data type: FloatingPoint32
Can be changed: U, T Scaling: - Dyn. index: DDS, p0180
Units group: - Unit selection: - Func. diagram: 6300, 6301
Min Max Factory setting
0.0 [%] 250.0 [%] 0.0 [%]
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