3.7.2
IO
contra1
“Io
control” is especially suited for machines with a large
breakaway torque. Compared to the V/f-characteristic control it
provides considerably larger torques up to the motor rated
Point.
The advantages of
IO
control
tan
be used especially for
Single
drives. lt is also possible for group drives, provided that the motors
are of the same type and have the same load,
e.g.
two identical
drives,
which
drive a common shaft from two sides.
V/f-rated frequency
To
program
the Io control, the
Io
setpoint
and the correct
V/f-rated
frequency must be set for the
motor(s)
(see page 70).
Io
setpoint
You
tan
determine the
Io
setpoint
using the
cos<p
, the rated motor
current
and the following diagram.
0.95
0.90
0.85
0.80
0.75
0.70
f
K
I
0.25 0.30 0.35 0.40 0.43 0.45 0.50 0.55
Example:
cos
cp=
0.85
+
K=0.43
1,
-
setpoint
=
K.
1
Nmotor
Enter the calculated value
under
CO20.
For group drives, multiply
the calculated value with the number of motors.
-
Code
IName
IParameter
(Factoty
setting is
printed
in bold) Acceptance
CO15
IV/f-rated
150
Hz
7.5 HZ
(0.1 Hz) 100
HzlON-LINE
frequency
I
100 Hz
(1
Hz)
960
Hz)/
CO20 1
Io-setpoint
IRated
setpolnt
(PNmotor
=
PNun,,)
ION-LINE
0.0 A (0.1
A}
100.0 A
as from 100 A
(1
A)
INFO: Adjustable from 0.0
to
0.5.
h,,
72
-
lmze
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