Siemens SINAMICS G120 CU230P-2, Operating Instructions Manual, Page: 219 / 346

Functions
7.7 Protection functions
Frequency inverters with Control Units CU230P-2 HVAC, CU230P-2 DP, CU230P-2 CAN
Operating Instructions, 01/2011, FW 4.4, A5E02430659B AD
217
There are two different groups of parameters for the V
DCmax
controller, depending on whether
the motor is being operated with U/f control or vector control.
Table 7- 31 V
DCmax
controller parameters
Parameter for
V/f control Parameter for
vector control Description
p1280 = 1 p1240 = 1 V
DC
controller or V
DC
monitoring configuration(factory setting:
1)1: Enable V
DCmax
controller
r1282 r1242 V
DCmax
controller switch-on level
Shows the value of the DC-link voltage above which the V
DCmax
controller is active
p1283 p1243 V
DCmax
controller dynamic factor (factory setting: 100 %) scaling
of the control parameters P1290, P1291 and P1292
p1290 p1250 V
DCmax
controller proportional gain (factory setting: 1)
p1291 p1251 V
DCmax
controller reset time (factory setting p1291: 40 ms,
factory setting p1251: 0 ms)
p1292 p1252 V
DCmax
controller rate time (factory setting p1292: 10 ms, factory
setting p1252: 0 ms)
p1294 p1254 V
DCmax-
controller automatic recording ON-signal level(factory
setting p1294: 0, factory setting p1254: 1)Activates or
deactivates automatic detection of the switch-on levels of the
V
DCmax
controller.
0: Automatic detection disabled
1: Automatic detection enabled
p0210 p0210 Unit supply voltage
If p1254 or p1294 = 0, the inverter uses this parameter to
calculate the intervention thresholds of the V
DCmax
controller.
Set this parameter to the actual value of the input voltage.
For more information about this function, see the List Manual (function diagrams 6320 and
6220).