Commissioning
5–17
1070 066 028-101 (01.05) GB
5.1.12
Slip compensation
The slip compensation serves to compensate for the speed drop between
no-load speed and load speed (= slip). Slip compensation is maintained
within a large speed range independent of load or the direction of rotation.
Calculate setting value
Enter the rated motor slip as a % value.
It is calculated from the motor rating plate data according to the following
formula:
s
N
= 1 –
n
N
n
0
with n
0
= 60
f
N
p
.
s
N
= 1 –
n
N
p
60 f
N
.
.
s
N
= rated motor slip
[%]
n
N
= rated speed
[min
–1
]
n
0
= no-load speed
[min
–1
]
f
N
= rated motor frequency
[Hz]
p
= number of pole pairs
[%]
Optimize setting value
The calculated setting value is falsified by slight deviations of the actual
motor data from the rating plate data.
For very precise applications, the setting value can therefore be corrected as
follows after commissioning pursuant to Section 5.2:
D
First set desired operating speed in no-load operation after
commissioning.
D
Apply a load to the motor.
D
Correct speed drop of the motor via P32:
P32 (A-0-0032)
Slip compensation
0.0
10 %
smallest step
Range [%]
factory
setting
all
DMs, DS
0.1
min.
max.