Siemens SINAMICS G120D Operating Instructions Manual page 229

The value of the output voltage at the rated motor frequency p0310 also depends on the
following variables:
• Ratio between the converter size and the motor size
• Line voltage
• Line impedance
• Actual motor torque
The maximum possible output voltage as a function of the input voltage is provided in the
technical data.
Table 8-48
Requirement
The required
torque is inde‐
pendent of the
speed
The required
torque increa‐
ses with the
speed
Table 8-49
Requirement
Applications
with a low dy‐
namic response
and constant
speed
The converter
must maintain
the motor
speed constant
for the longest
possible time.
Converter with the control units CU240D-2
Operating Instructions, 10/2020, FW V4.7 SP13, A5E34262100B AH
Technical data (Page 329)
The characteristic that matches the application
Application exam‐
ples
Conveyor belts,
roller conveyors,
chain conveyors,
eccentric worm
pumps, compres‐
sors, extruders,
centrifuges, agita‐
tors, mixers
Centrifugal
pumps, radial fans,
axial fans
Characteristics for special applications
Application exam‐
ples
Centrifugal
pumps, radial fans,
axial fans
Drives in the textile
sector
Remark
-
The converter compensates for the
voltage drops across the stator re‐
sistance. Recommended for mo‐
tors less than 7.5 kW.
Precondition: You have set the mo‐
tor data according to the rating
plate and have performed the mo‐
tor identification after quick com‐
missioning.
Lower losses in the motor and con‐
verter than for a linear characteris‐
tic.
Remark
If the speed setpoint is reached and
remains unchanged for 5 seconds,
then the converter reduces its out‐
put voltage.
As a consequence, the ECO mode
saves energy with respect to the
parabolic characteristic.
When reaching the maximum cur‐
rent limit, the converter only re‐
duces the output voltage, but not
the frequency.
Advanced commissioning
8.16 Motor control
Charac‐ Parameter
teristic
Linear p1300 = 0
Linear p1300 = 1
with Flux
Current
Control
(FCC)
Parabol‐ p1300 = 2
ic
Charac‐ Parameter
teristic
ECO p1300 = 4
mode or
p1300 = 7
Precise p1300 = 5
frequen‐ or
cy charac‐ p1300 = 6
teristic
227