18 - Slip Compensation Parameters
Code Parameter Name / Range
18-00 Slip compensation gain at low speed
0.00~2.50
18-01 Slip compensation gain at high speed
-1.00~1.00
18-02 Slip compensation limit
0~250%
18-03 Slip compensation filter
0.0~10.0 s
18-04 Regenerating slip compensation selection
0: Disable
1: Enable
18-05 FOC delay time
1~1000 msec
18-06 FOC gain
0.00~2.00
Slip compensation automatically adjusts the output frequency based on the motor load to improve the speed
accuracy of the motor mainly in V/f mode.
The slip compensation function compensates for the motor slip to match the actual motor speed to the refer-
ence frequency.
SlipcompensationadjustmentinV/fmode
18-00: Slip compensation gain at low speed
The adjustment of slip compensation gain at low speed follows the below procedure:
1. Set the rated slip and the motor no-load current (02-00).
2. Set the slip compensation (18-00) to1.0 (factory default setting is 0.0 in V / F control mode)
3. For the operation with a load attached, measure the speed and adjust the slip gain (18-00) accordingly
(increase in steps of 0.1).
- If the motor speed is lower than frequency reference, increase the value of 18-00.
- If the motor speed is higher than frequency reference, decrease the value of 18-00.
When the output current is greater than the no-load current (02-00), the slip compensation is enabled and the
output frequency increases from f1 to f2. Refer to Figure 4.4.99., the slip compensation value is calculated as
follows:
[ Output current (12-18) - no-load current of Motor 1 (02-00) ]
Slip Compensation Value = Motor rated slip frequency x
[ Rated current of Motor 1(02-01) - no-load current of Motor 1 (02-00) ]
Figure4.4.99Slipcompensationoutputfrequency
Load Torque
Speed
Larger Load
Smaller Load f2f1
18-02: Slip compensation limit
Sets slip compensation limit in constant torque and the constant power operation (gure 4.4.100).
If 18-02 is 0%, the slip compensation limit is disabled.
VDI100 • Instruction manual 257
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