Siemens SINAMICS G120 Operating Instructions Manual page 332

Advanced commissioning
6.30 Motor and inverter protection by limiting the voltage
The Vdc_max control can be used only with the PM230, PM240‑2, PM240P‑2 and PM330
Power Modules. The Vdc_max control is not required if you use a braking resistor.
PM250 Power Modules feed back regenerative energy into the line supply. Therefore, the
Vdc_max control is not required for a PM250 Power Module.
Parameters of the Vdc_max control
The parameters differ depending on the motor control mode.
Parameter for V/
f control
p1280 = 1
r1282
p1283
p1284
p1290
p1291
p1292
p1294
p0210
For more information about this function, see the List Manual (function diagrams 6320 and
6220).
332
Parameter for Description
vector control
p1240 = 1 Vdc controller configuration(Factory setting: 1)
1: VDC controller is enabled
r1242 Vdc_max control activation level
DC link voltage value above which the Vdc_max control is activa‐
ted
p1243 Vdc_max control dynamic factor (factory setting: 100 %)
Scaling control parameters p1290, p1291 and p1292
--- Vdc_max controller time threshold
Setting the monitoring time of the Vdc_max controller.
p1250 Vdc_max control proportional gain (factory setting: 1)
p1251 Vdc_max control integral time (factory setting p1291: 40 ms,
p1251: 0 ms)
p1252 Vdc_max control rate time (factory setting p1292: 10 ms, p1252:
0 ms)
p1254 Vdc_max control automatic ON level sensing(factory setting, de‐
pendent on the Power Module)
Automatically sense switch-on levels of the Vdc_max control.
0: Automatic detection disabled
1: Automatic detection enabled
p0210 Unit supply voltage
If p1254 or p1294 = 0, the inverter uses this parameter to calculate
the switch-in thresholds of the Vdc_max control.
Set this parameter to the actual value of the input voltage.
Operating Instructions, 09/2017, FW V4.7 SP9, A5E34257946B AE
Converter with the CU230P-2 Control Units