Chapter 12 Description of Parameter SettingsME300
12.1-07-12
Slip Compensation Gain (V/F and SVC Control Mode)
Slip Compensation Gain (Motor 2)
Default: 0.00
Settings 0.00–10.00 (Default value is 1 in SVC mode)
The induction motor needs constant slip to produce magnetic torque. It can be ignored at higher
motor speeds, such as rated speed or 2–3% of slip.
In operation, the slip and the synchronous frequency are in reverse proportion to produce the
same magnetic torque. The slip is larger with the reduction of the synchronous frequency. The
motor may stop when the synchronous frequency decreases to a specific value. Therefore, the
slip seriously affects the motor speed accuracy at low speed.
In another situation, when you use an induction motor with the drive, the slip increases when the
load increases. It also affects the motor speed accuracy.
Use this parameter to set the compensation frequency, and reduce the slip to maintain the
synchronous speed when the motor runs at the rated current in order to improve the accuracy of
the drive. When the drive output current is higher than Pr.05-05 (No-load Current of Induction
Motor 1 (A)), the drive compensates the frequency with this parameter.
This parameter is set to 1.00 automatically when Pr.00-11 (Speed Control Method) is changed
from V/F mode to vector mode. Apply the slip compensation after load and acceleration. Increase
the compensation value from small to large gradually; add the output frequency with motor rated
slip * Pr.07-27 (Slip Compensation Gain) when the motor is at the rated load. If the actual speed
ratio is slower than expected, increase the parameter setting value; otherwise, decrease the
setting value.
Slip Deviation Level
Default: 0
Settings 0.0–100.0%
0: No detection
Slip Deviation Detection Time
Default: 1.0
Settings 0.0–10.0 sec.
Slip Deviation Action
Default: 0
Settings 0: Warn and continue operation
1: Warn and ramp to stop
2: Warn and coast to stop
3: No warning
Parameters Pr.07-29–Pr.07-31 set the allowable slip level/time and the over-slip action when the
drive is running.
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