Firmware
≤
02.00 - DMS 2.1 EN - 03/2011
L
105
8400 motec | Software Manual
Motor control (MCTRL)
Parameterisable additional functions
5.9.4
Slip compensation
Under load, the speed of an asynchronous machine decreases. This load-dependent speed
drop is called slip. The slip can partly be compensated for by the setting in
.
The setting of
can be done automatically in the course of motor parameter
Automatic motor data identification
The setting must be made manually if the motor parameter identification cannot be
called up.
How to set the slip compensation manually:
1. Calculate the slip compensation according to motor nameplate data:
2. Transfer the calculated slip constant s to
3. Correct the setting in
while the drive is running until the load-dependent
speed drop does not occur anymore between idling and maximum load of the
motor in the desired speed range.
Tip!
The following guide value applies to a correctly set slip compensation:
• Deviation from the rated motor speed
≤
1% for the speed range of 10 % ... 100 %
of the rated motor speed and loads
≤
rated motor torque.
• Greater deviations are possible in the field weakening range.
• If
is set too high, the drive may get unstable.
• Negative slip (
< 0) with V/f characteristic control results in "smoother"
drive behaviour at heavy load impulses or applications requiring a significant
speed drop under load.
Parameter
Info
Lenze setting
Value Unit
Slip compensation
0.00 %
s Slip constant (
n
rsyn
Synchronous motor speed [rpm]
n
r
Rated motor speed according to the motor
nameplate [rpm]
f
r
Rated motor frequency according to the
motor nameplate [Hz]
p Number of motor pole pairs (1, 2, 3 ...)
s
n
rsyn
n
r
–
n
rsyn
-----------------------
100%
⋅
=
n
rsyn
f
r
60
⋅
p
---------------
=
Summary of Contents for 8400 motec Series
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