4-220
Load Torque
Speed
Larger Load
Smaller Load
f2
f1
F
igure 4.3.99 Slip compensation output frequency
18-01: Slip compensation gain at high speed
(1) It is not required to adjust the Slip compensation gain at high speed for a loaded motor.
(2) After adjusting parameter 18-00 it is recommended to increase the reference frequency and check the motor
speed. Increase the value of 18-01 to adjust the slip compensation in case the motor speed does not match.
(3) To reduce speed errors Increase the motor rated frequency (01-12 base frequency) and increase the value
of 18-01.
(3) Compared to 18-00, 18-01 serves as a variable gain for the full speed range.
(4) If the speed accuracy becomes worse due to an increase in motor temperature it is recommended to use a
combination of 18-00 and 18-01 to adjustment motor slip.
Parameter 18-01 determines the slip compensation at the motor rated speed and is calculated follows:
Reference Frequency
Slip Compensation Gain=(Slip Compensation Gain at low speed + Slip Compensation Gain at high speed) x
Motor rated frequency (01-12)
Slip compensation
Frequency
Reference
18-01
18-00
Figure 4.3.102 Parameter 18-00/18-01 Slip compensation gain versus frequency reference
Torque
Speed
Decrease
18-01
Decrease
18-01
Increase
18-01
Increase
18-01
Figure 4.3.103 Parameter 18-01 Effect on speed/torque curve