Siemens SINAMICS G120 List Manual page 189

p1240 = 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.
- the Vdc_min controller cannot be used when the line voltage is permanently below 380 V (if required, p1247 should
be reduced).
p1240[0...n] Vdc controller configuration (vector control) / Vdc ctr config vec
PM240 Access level: 3
Can be changed: U, T
Unit group: -
Min
0
Description: Sets the controller configuration of the DC link voltage (Vdc controller) in the closed-loop control mode.
For U/f control: see p1280.
Value: 0:
1:
2:
3:
Dependency: Not visible with application class: "Standard Drive Control" (SDC, p0096 = 1)
Refer to: p1245
Refer to: A07400, A07401, A07402, F07405, F07406
Notice: An excessively high value in p1245 can possibly negatively influence the normal operation of the drive.
Note: If a braking resistor is connected to the DC link (p0219 > 0), then the Vdc_max control is automatically de-activated.
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
PM230 Access level: 3
PM230_STO
Can be changed: -
PM240
Unit group: -
Min
- [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)
Dependency: Not visible with application class: "Standard Drive Control" (SDC, p0096 = 1)
Notice: If the activation level of the Vdc_max controller is already exceeded in the de-activated state (pulse inhibit) by the DC
link voltage, then the controller can be automatically de-activated (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.
SINAMICS G120 Control Units CU240B-2/CU240E-2
List Manual (LH11), 01/2016, A5E33839529
Inhib Vdc ctrl
Enable Vdc_max controller
Enable Vdc_min controller (kinetic buffering)
Enable Vdc_min controller and Vdc_max controller
Calculated: -
Scaling: -
Unit selection: -
Max
3
Calculated: -
Scaling: p2001
Unit selection: -
Max
- [V]
2 Parameters
2.2 List of parameters
Data type: Integer16
Dyn. index: DDS, p0180
Func. diagram: 6220
Factory setting
1
Data type: FloatingPoint32
Dyn. index: -
Func. diagram: 6220
Factory setting
- [V]
189