Siemens SINAMICS G120 Operating Instructions Manual page 338

Advanced commissioning
6.27 Motor and inverter protection by limiting the voltage
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).
336
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, 04/2018, FW V4.7 SP10, A5E31759476B AG
Converter with the CU250S-2 Control Units