Description: Sets a dynamic voltage reserve.
Dependency: See also: p0500
Note
In the field weakening range, it must be expected that the control dynamic performance is somewhat restricted due to
the limited possibilities of controlling/adjusting the voltage. This can be improved by increasing the voltage reserve.
Increasing the reserve reduces the steady-state maximum output voltage (r0071).
p1575[0...n] Voltage target value limit / U_tgt val lim
Access level: 4 Calculated: - Data type: FloatingPoint32
Can be changed: T, U Scaling: - Dynamic index: DDS, p0180
Unit group: - Unit selection: - Function diagram: 6725
Min:
50.00 [%]
Max:
300.00 [%]
Factory setting:
200.00 [%]
Description: Sets the limit of the voltage target value.
In steady-state field weakening operation this corresponds to the required output voltage.
The value of 100% refers to p0304.
Note
The output voltage is only limited if the maximum output voltage (r0071) minus the voltage reserve (p1574)
corresponds to a value higher than p1575.
Limiting via p1575 allows the influence of the voltage ripple of the line supply voltage to be eliminated at the operating
point.
p1578[0...n] Flux reduction flux decrease time constant / Flux red dec T
Access level: 3 Calculated: CALC_MOD_CON Data type: FloatingPoint32
Can be changed: T, U Scaling: - Dynamic index: DDS, p0180
Unit group: - Unit selection: - Function diagram: 6791
Min:
20 [ms]
Max:
5000 [ms]
Factory setting:
200 [ms]
Description: The following applies for a synchronous reluctance motor:
Sets the time constant for reducing the flux setpoint for a load-dependent optimum flux characteristic.
Dependency: See also: p1579
Note
To avoid remagnetization processes for load-dependent flux characteristics and for fast load changes, the time
constant to reduce the flux setpoint must be set to an appropriately high value.
As a consequence, it is preset with a multiple of the time constant used for the flux build up.
p1579[0...n] Flux reduction flux build-up time constant / Flux red incr T
Access level: 3 Calculated: CALC_MOD_CON Data type: FloatingPoint32
Can be changed: T, U Scaling: - Dynamic index: DDS, p0180
Unit group: - Unit selection: - Function diagram: 6791
Min:
0 [ms]
Max:
5000 [ms]
Factory setting:
4 [ms]
Description: The following applies for a synchronous reluctance motor:
Sets the time constant for establishing the flux setpoint for a load-dependent optimum flux characteristic.
Dependency: See also: p1578
Note
To quickly establish the flux for torque changes, an appropriately short time constant for the flux build-up must be
selected.
It is preset with the inverse value of the rated motor frequency (p0310).
Parameters
7.2 Parameter list
SINAMICS G120X converter
Operating Instructions, 06/2019, FW V1.01, A5E44751209B AC 693
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