Functions
8.24 Open-loop and closed-loop control
Control Units CU240S
8-162 Operating Instructions, 11/2006, A5E00766042B AA
Table 8-33 V/f characteristics (parameter P1300)
Parameter
value
Significance Use/property
0 Linear
characteristic
Standard case
1 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.
2 Square-law
characteristic
This is a characteristic which
takes into consideration the
torque characteristic of the
motor load (e.g. fan/pump):
a) Square-law characteristic
(f
2
characteristic)
b) Energy saving as the
lower voltage also results
in lower currents and
losses.
9
Q
I
Q
9
I
3
3 Programmable
characteristic
Characteristic which takes into
consideration the torque
characteristic of the
motor/driven load (e.g.
synchronous motor).
9
3
I
3
I
PD[
3
9
PD[
U
9
Q
3
3
3
I
+]
I
3
I
3
I
Q
3
I
3
3
5 Application
adaptation
This is a characteristic which takes into consideration the special
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
6 Application
adaptation
with FCC
This is a characteristic which takes into consideration the special
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
19 Independent
voltage input
The user can enter the output voltage of the inverter, independently
of the frequency, using a BICO parameter P1330 via the interfaces
(e.g. analog input → P1330 = 755).
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