Optimizing With A High Break Loose Torque And Brief Overload - Siemens Sinamics G120P Operating Instructions Manual

Table 7- 22 Characteristics for special applications
Requirement Application examples
Applications with a Centrifugal pumps,
low dynamic re- radial fans, axial fans
sponse and con-
stant speed
Additional information on V/f characteristics can be found in the parameter list and in the
function diagrams 6300 ff of the List Manual.
7.5.3.3

Optimizing with a high break loose torque and brief overload

Setting the voltage boost for V/f control
The voltage boost acts on every V/f
characteristic. The adjacent diagram
shows the voltage boost using a linear
characteristic as example.
Procedure
Proceed as follows to set the voltage boost:
Only increase the voltage boost in small steps. Excessively high values in p1310 ... p1312
can cause the motor to overheat and switch off (trip) the inverter due to overcurrent.
1. Power-up the motor with an average speed.
2. Reduce the speed to just a few revolutions per minute.
3. Check whether the motor rotates smoothly.
4. If the motor does not rotate smoothly, or even remains stationary, increase the voltage
boost p1310 until you are satisfied with the motor behavior.
Inverter cabinet units
Operating Instructions, 12/2014, A5E32923362A
Remark
The ECO mode results in additional ener-
gy saving when compared to the parabolic
characteristic.
If the speed setpoint is reached and re-
mains unchanged for 5 seconds, the in-
verter again reduces its output voltage.
Functions
7.5 Motor control
Characteristic Parameter
ECO mode p1300 = 4
(linear ECO
characteristic
curve)
or
p1300 = 7
(parabolic
ECO charac-
teristic curve)
363