Siemens SINAMICS G120C, Руководство по эксплуатации

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The value of the output voltage at the rated motor frequency also depends on the following
variables:
● Ratio between the inverter 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.
Technical data (Page 401)
Table 6-48 Linear and parabolic characteristics
Requirement Application examples Remark Characteris‐
tic
Parameter
The required tor‐
que is independent
of the speed
Conveyor belts, roller
conveyors, chain con‐
veyors, eccentric worm
pumps, compressors,
extruders, centrifuges,
agitators, mixers
- Linear p1300 = 0
The inverter equalizes the voltage drops across
the stator resistance. Recommended for motors
less than 7.5 kW.
Precondition: You have set the motor data accord‐
ing to the rating plate and have performed the mo‐
tor identification after quick commissioning.
Linear with
Flux Cur‐
rent Control
(FCC)
p1300 = 1
The required tor‐
que increases with
the speed
Centrifugal pumps, ra‐
dial fans, axial fans
Lower losses in the motor and inverter than for a
linear characteristic.
Parabolic p1300 = 2
Table 6-49 Characteristics for special applications
Requirement Application
examples
Remark Characteristic Parameter
Applications with a low dy‐
namic response and con‐
stant speed
Centrifugal
pumps, radial
fans, axial
fans
If the speed setpoint is reached, and remains
unchanged for 5 seconds, then the inverter re‐
duces is output voltage.
As a consequence, the ECO mode saves en‐
ergy with respect to the parabolic characteris‐
tic.
ECO mode p1300 = 4
or
p1300 = 7
The inverter must maintain
the motor speed constant for
the longest possible time.
Drives in the
textile sector
When reaching the maximum current limit, the
inverter only reduces the output voltage, but
not the frequency.
Precise fre‐
quency char‐
acteristic
p1300 = 5
or
p1300 = 6
Freely adjustable U/f charac‐
teristic
- - Adjustable
characteristic
p1300 = 3
U/f characteristic with inde‐
pendent voltage setpoint
- The interrelationship between the frequency
and voltage is not calculated in the inverter,
but is specified by the user.
Independent
voltage set‐
point
p1300 = 19
Additional information on U/f characteristics can be found in the parameter list and in the
function diagrams 6300 ff of the List Manual.
Advanced commissioning
6.19 Motor control
SINAMICS G120C converter
262
Operating Instructions, 09/2017, FW V4.7 SP9, A5E34263257B AF