Optimizing With A High Break Loose Torque And Brief Overload - Siemens SINAMICS G120 Operating Instructions Manual

Functions
9.6 Motor control
Table 9- 28 Characteristics for special applications
Requirement Application examples
Applications with a Centrifugal pumps,
low dynamic radial fans, axial fans
response and
constant speed
The inverter must Drives in the textile
keep the motor sector
speed constant
under all
circumstances.
Freely adjustable Operating the inverter
U/f characteristic with a synchronous
motor
U/f characteristic -
with independent
voltage setpoint
Additional information on U/f characteristics can be found in the parameter list and in the
function diagrams 6300 ff of the List Manual.
9.6.1.3

Optimizing with a high break loose torque and brief overload

Voltage boost of the U/f control
The voltage boost acts on every U/f
characteristic. The adjacent diagram
shows the voltage boost using a linear
characteristic as example.
188
Remark
The ECO mode results in additional
energy saving when compared to the
parabolic characteristic.
If the speed setpoint is reached and
remains unchanged for 5 seconds, then
the inverter again reduces its output
voltage.
When the maximum current limit is
reached, the inverter only reduces the
stator voltage but not the speed.
-
The interrelationship between the
frequency and voltage is not calculated in
the inverter, but is specified by the user.
Operating Instructions, 03/2012, FW V4.5, A5E02999804B AB
Characteristic Parameter
ECO mode p1300 = 4
or
p1300 = 7
precise p1300 = 5
frequency or
characteristic p1300 = 6
Parameterizable p1300 = 3
characteristic
Independent p1300 = 19
voltage setpoint
SINAMICS G120C frequency converter