Lenze L-force 8400 BaseLine D - Page 81

Firmware 03.00 - DMS EN 5.0 - 07/2009 L 81
8400 BaseLine D | Software Manual
Motor control (MCTRL)
Selection of the operating mode
 How to set the slip compensation manually:
1. Calculate the slip compensation from the data of the motor nameplate:
[5-1] Calculation of the slip compensation from the motor data
2. Enter the result in code C021
3. When the drive is running, correct the code C021 until no load-dependent speed
drop occurs anymore in the speed range between idle state and maximum load of
the motor. The guide value for a correctly set slip compensation is as follows:
• 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
 Tip!
•If C021
is set too high, the drive may become unstable.
• Negative slip (C021
< 0) in conjunction with V/f characteristic control results in
"smoother" drive behaviour at heavy load impulses or applications requiring a
significant speed drop under load.
s Slip constant C021 [%]
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
-------------- -=