Functions
8.24 Open-loop and closed-loop control
Table 8-33
Parameter
value
0
1
2
3
5
6
19
8-162
V/f characteristics (parameter P1300)
Significance
Use/property
Linear
Standard case
characteristic
FCC
Can give a more efficient and better load response than other V/f
modes because the FCC characteristic automatically compensates
the voltage losses of the stator resistance for static (steady-state) or
dynamic loads (flux current control FCC). This is used especially for
small motors which have a relatively high stator resistance.
Square-law
This is a characteristic which
characteristic
takes into consideration the
torque characteristic of the
motor load (e.g. fan/pump):
a) Square-law characteristic
(f
characteristic)
2
b) Energy saving as the
lower voltage also results
in lower currents and
losses.
Programmable
Characteristic which takes into
characteristic
consideration the torque
characteristic of the
motor/driven load (e.g.
synchronous motor).
Application
This is a characteristic which takes into consideration the special
adaptation
technological issues of an application (e.g. textile applications),
a) Where the current limiting (Imax controller) only influences
the output voltage and not the output frequency, and
b) By inhibiting the slip compensation
Application
This is a characteristic which takes into consideration the special
adaptation
technological issues of an application (e.g. textile applications),
with FCC
a) Where the current limiting (Imax controller) only influences
the output voltage and not the output frequency, and
b) By inhibiting the slip compensation
Independent
The user can enter the output voltage of the inverter, independently
voltage input
of the frequency, using a BICO parameter P1330 via the interfaces
(e.g. analog input → P1330 = 755).
Operating Instructions, 11/2006, A5E00766042B AA
Control Units CU240S