Siemens CU240B-2 Operating Instructions

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
Parameter for
vector control
Description
p1280 = 1 p1240 = 1 Vdc controller configuration(Factory setting: 1)
1: VDC controller is enabled
r1282 r1242 Vdc_max control activation level
DC link voltage value above which the Vdc_max control is activa‐
ted
p1283 p1243 Vdc_max control dynamic factor (factory setting: 100 %)
Scaling control parameters p1290, p1291 and p1292
p1284 --- Vdc_max controller time threshold
Setting the monitoring time of the Vdc_max controller.
p1290 p1250 Vdc_max control proportional gain (factory setting: 1)
p1291 p1251 Vdc_max control integral time (factory setting p1291: 40 ms,
p1251: 0 ms)
p1292 p1252 Vdc_max control rate time (factory setting p1292: 10 ms, p1252:
0 ms)
p1294 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 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.
For more information about this function, see the List Manual (function diagrams 6320 and
6220).
Advanced commissioning
6.30 Motor and inverter protection by limiting the voltage
Converter with the CU230P-2 Control Units
332 Operating Instructions, 09/2017, FW V4.7 SP9, A5E34257946B AE

Siemens CU240B-2 Specifications

General

Brand	Siemens
Model	CU240B-2
Category	Inverter
Language	English