Siemens SINAMICS G120XA, Operating Instructions Manual

Page: 500 / 918

Dependency: See also: p1245
See also: A07400, A07401, A07402, F07405, F07406
NOTICE
An excessively high value in p1245 can possibly negatively influence the normal operation of the drive.
Note
p1240 = 1, 3:
When the DC link voltage limit specified for the power unit is reached the following applies:
- the Vdc_max controller limits the regenerative energy in order that the DC link voltage is kept below the maximum DC
link voltage when braking.
- the ramp-down times are automatically increased.
p1240 = 2, 3:
When the switch-in threshold of the Vdc_min controller is reached (p1245), the following applies:
- the Vdc_min controller limits the energy taken from the DC link in order to keep the DC link voltage above the minimum
DC link voltage when accelerating.
- the motor is braked in order to use its kinetic energy to buffer the DC link.
r1242 Vdc_max controller switch-in level / Vdc_max on_level
CUG120XA_USS
(Vdc_max)
Access level: 3 Calculated: - Data type: FloatingPoint32
Can be changed: - Scaling: p2001 Dynamic index: -
Unit group: - Unit selection: - Function diagram: 6220
Min:
- [V] Max:
- [V] Factory setting:
- [V]
Description: Displays the switch-in level for the Vdc_max controller.
If p1254 = 0 (automatic sensing of the switch-in level = off), then the following applies:
r1242 = 1.15 * sqrt(2) * p0210 (supply voltage)
PM230: r1242 is limited to Vdc_max - 50.0 V.
If p1254 = 1 (automatic sensing of the switch-in level = on), then the following applies:
r1242 = Vdc_max - 50.0 V (Vdc_max: Overvoltage threshold of the power unit)
r1242 = Vdc_max - 25.0 V (for 230 V power units)
NOTICE
If the activation level of the Vdc_max controller is already exceeded in the deactivated state (pulse inhibit) by the DC
link voltage, then the controller can be automatically deactivated (see F07401), so that the drive is not accelerated the
next time that it is activated.
Note
The Vdc_max controller is not switched back off until the DC link voltage falls below the threshold 0.95 * r1242 and the
controller output is zero.
p1243[0...n] Vdc_max controller dynamic factor / Vdc_max dyn_factor
CUG120XA_USS
(Vdc_max)
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: 6220
Min:
1 [%] Max:
10000 [%] Factory setting:
100 [%]
Description: Sets the dynamic factor for the DC link voltage controller (Vdc_max controller).
100% means that p1250, p1251, and p1252 (gain, integral time, and rate time) are used corresponding to their basic
settings and based on a theoretical controller optimization.
If subsequent optimization is required, this can be carried out using the dynamic factor. In this case p1250, p1251,
p1252 are weighted with the dynamic factor p1243.
Parameters
7.3 Parameters
SINAMICS G120XA converter
498
Operating Instructions, 03/2019, FW V1.0, A5E44751205B AB