Slip Compensation - Lenze 8400 StateLine C Reference Manual

5.9.6

Slip compensation


Note!
Slip compensation is only active with the following motor control modes:
• V/f characteristic control (VFCplus)
• Sensorless vector control (SLVC)
Under load, the speed of an asynchronous motor decreases. This load-dependent speed
drop is called slip. The slip can partly be compensated for by the setting in C00021.
Parameter
C00021
 The setting of
identification.
 The setting must be made manually if the motor parameter identification cannot be
called up.

How to set the slip compensation manually:
1. Set rated motor current (C00088) and rated motor frequency (C00089).
2. Calculate the slip compensation according to motor nameplate data:
3. Transfer the calculated slip constant s to C00021.
4. Correct the setting in
speed drop does not occur anymore between idling and maximum load of the
motor in the desired speed range.
Firmware ≤ 11.00 - DMS 8.0 EN - 10/2011
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Info
Slip compensation
C00021 can be done automatically in the course of motor parameter
Automatic motor data identification
n n
–
rsyn r
s ----------------------- 100% ⋅
=
n
rsyn
f 60
⋅
r
n
= -------------- -
rsyn
p
C00021
L
8400 StateLine C | Reference manual
Parameterisable additional functions
( 125)
( 160)
( 112)
s Slip constant (C00021) [%]
n Synchronous motor speed [rpm]
rsyn
n Rated motor speed according to the motor
r
nameplate [rpm]
f Rated motor frequency according to the
r
motor nameplate [Hz]
p Number of motor pole pairs (1, 2, 3 ...)
while the drive is running until the load-dependent
Motor control (MCTRL)
Lenze setting
Value Unit
2.11 %
207