Control, I - set - value = k i – Lenze 8615E User Manual
Page 72
70
3.7.2 I
0
control
"I
0
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 I
0
control can be used especially for single
drives. It 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 I
0
control, the I
0
set-value and the correct V/f rated
frequency must be set for the motor(s) (see page 68).
I
0
set-value
You can determine the I
0
set-value using the cos
ϕ
, the rated motor
current and the following diagram.
0.70
0.75
0.80
0.85
0.90
0.95
1.00
0.25
0.30
0.35
0.40
0.45
0.50
0.55
0.43
K
cos
Example:
cos
ϕ
= 0.85
→
K = 0.43
I - set - value = K I
0
N
motor
⋅
Enter the calculated value under C020. For group drives, multiply
the calculated value with the number of motors.
Code
Parameter
Meaning
Acceptance
C015
50.0Hz
7.5...960Hz
V/f rated frequency
ON-LINE
C020
0.0...0.5A
⋅
I
max inverter
I
0
set-value
ON-LINE