Yaskawa Matrix Converter - Manual (Page 197)

6
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Improved Operating Efficiency
This section explains functions for improving motor operating efficiency.
‹ Reducing Motor Speed Fluctuation (Slip Compensation Function)
With larger loads, the amount of motor slip increases while to motor speed decreases. The slip compensation
function controls the motor at a constant speed, regardless of changes in load. When the motor is operating at
the rated load, parameter E2-02 (Motor Rated Slip)
× the frequency in parameter C3-01 is added to the output
frequency.
„ Related Parameters
* The default will change when the control method is changed. The values in the table above are the defaults when using Open Loop Vector Control.
Parameter
Number
Name
Description
Setting
Range
Default
Change
during
Run
Control Methods
Display V/f
Open
Loop
Vector
Flux
Vector
C3-01
Slip Compensa-
tion Gain This parameter is used to increase motor
speed to account for motor slip by boosting
the output frequency. If the speed is lower
than the frequency reference, increase C3-01.
If the speed is higher than the frequency refer-
ence, decrease C3-01.
Note: Adjustment is not normally required.
When operating in Open Loop Vector,
this parameter works as a function to
set the proper amount of gain.
0.0 to
2.5
1.0* Yes A A A
Slip Comp Gain
C3-02
Slip Compensa-
tion Primary Delay
Time
This parameter adjusts the filter on the output
of the slip compensation function. Increase to
add stability, decrease to improve response.
0 to
10000
200 ms
*
No A A No
Slip Comp Time
C3-03
Slip Compensa-
tion Limit
This parameter sets the upper limit for the slip
compensation function. It is set as a percent-
age of motor rated slip (E2-02).
0 to
250
200% No A A No
Slip Comp Limit
C3-04
Slip Compensa-
tion Selection Dur-
ing Regeneration Determines whether slip compensation is
enabled or disabled during regenerative oper-
ation.
0: Disabled.
1: Enabled.
0 or 1 0 No A A No
Slip Comp Regen
C3-05
Output Voltage
Limit Operation
Selection Determines if the motor magnetic flux is auto-
matically decreased when output voltage satu-
ration occurs.
0: Disabled.
1: Enabled.
0 or 1 0 No No A A
V/f Slip Cmp Sel