Selecting The U/F Characteristic - Siemens Sinamics G110M Original Instructions Manual

Distributed converter for simogear geared motors
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Functions
8.6 Motor control
The value of the output voltage at the rated motor frequency 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, also see Section Technical data (Page 303).
8.6.1.2

Selecting the U/f characteristic

Table 8- 12
Linear and parabolic characteristics
Requirement
Application examples
The required
Conveyor belts, roller
torque is inde-
conveyors, chain con-
pendent of the
veyors, eccentric worm
speed
pumps, compressors,
extruders, centrifuges,
agitators, mixers
The required
Centrifugal pumps,
torque increases
radial fans, axial fans
with the speed
Table 8- 13
Characteristics for special applications
Requirement
Application examples
Applications with a
Centrifugal pumps,
low dynamic re-
radial fans, axial fans
sponse and con-
stant speed
The inverter must
Drives in the textile
keep the motor
sector
speed constant
under all circum-
stances.
Freely adjustable
-
U/f characteristic
U/f characteristic
-
with independent
voltage setpoint
184
Remark
-
The inverter equalizes the voltage drops
across the stator resistance. Recom-
mended for motors less than 7.5 kW.
Precondition: You have set the motor data
according to the rating plate and have
performed the motor identification after
the basic commissioning.
Lower losses in the motor and inverter
than for a linear characteristic.
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.
When the maximum current limit is
reached, the inverter only reduces the
stator voltage but not the speed.
-
The interrelationship between the fre-
quency and voltage is not calculated in
the inverter, but is specified by the user.
Operating Instructions, 04/2015, FW V4.7.3, A5E31298649B AD
Characteristic
Parameter
Linear
p1300 = 0
Linear with Flux
p1300 = 1
Current Control
(FCC)
Parabolic
p1300 = 2
Characteristic
Parameter
ECO mode
p1300 = 4
or
p1300 = 7
Precise fre-
p1300 = 5
quency charac-
or
teristic
p1300 = 6
Adjustable char-
p1300 = 3
acteristic
Independent
p1300 = 19
voltage setpoint
SINAMICS G110M Operating Instructions

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