Siemens SINAMICS G120P, Руководство по эксплуатации

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Functions
7.5 Motor control
Inverter cabinet units
362
Operating Instructions, 12/2014, A5E32923362A
The value of the motor 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
7.5.3.2 Selecting the V/f characteristic
Procedure
Proceed as follows to select a V/f characteristic in STARTER:
1.
Go online.
2. Select the V/f characteristic curve in one of the screen forms "Speed closed-loop
controller" or "V/f control".
Proceed as follows to select a V/f characteristic with the IOP:
1.
Select the "Parameters" menu.
2. Select "Expert" as parameter filter.
3. Select parameter p1300.
4. Set p1300 to the appropriate value.
Table 7- 21 Linear and parabolic characteristics
Requirement Application examples Remark Characteristic Parameter
The required
torque is inde-
pendent of the
speed
Eccentric-worm pump,
compressor
- Linear p1300 = 0
The inverter equalizes the voltage drops
across the stator resistance.
Precondition: You have set the motor data
according to the type plate and have per-
formed the motor identification after the
basic commissioning.
Linear with Flux
Current Control
(FCC)
p1300 = 1
The required
torque increases
with the speed
Centrifugal pumps,
radial fans, axial fans,
compressors
Lower losses in the motor and inverter
than for a linear characteristic.
Parabolic p1300 = 2