4-275
18-04
Regenerating slip compensation selection
Range
0: Disable
1: Enable
18-05
FOC delay time
Range
1~1000 msec
18-06
FOC gain
Range
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 reference
frequency.
Slip compensation adjustment in V/F mode
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) ]
(Motor no-load synchronous speed – Motor full load rated speed)(N) x Motor Poles (P)
Motor Rated Slip Frequency (f) =
120
Figure 4.4.99 Slip compensation output frequency
To Next Page
Loading...
