Firmware
≤
11.00 - DMS 8.0 EN - 10/2011
L
207
8400 StateLine C | Reference manual
Motor control (MCTRL)
Parameterisable additional functions
5.9.6
Slip compensation
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
.
The setting of
C00021
can be done automatically in the course of motor parameter
identification.
Automatic motor data identification
(
112)
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
C00021
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.
Note!
Slip compensation is only active with the following motor control modes:
•
V/f characteristic control (VFCplus)
(
125)
•
Sensorless vector control (SLVC)
(
160)
Parameter
Info
Lenze setting
Value Unit
C00021
Slip compensation
2.11 %
s Slip constant (
C00021
) [%]
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
---------------
=
Phone: 800.894.0412 - Fax: 888.723.4773 - Web: www.clrwtr.com - Email: info@clrwtr.com
