6-32
Improved Operating Efficiency
This section explains functions for improving motor operating efficiency.
Reducing Motor Speed Fluctuation (Slip Compensation Function)
When the load is large, the amount of motor slip also grows large and the 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 display shows the factory settings for Open Loop Vector. Default settings will change in accordance with the control mode.
* 1. Factory default changes based on motor control mode.
Parameter
Number
Name
Description
Setting
Range
Factory
Setting
Change
during
Operation
Control Methods
Display
V/f
V/f
with
PG
Open
Loop
Vector
1
Flux
Vector
Open
Loop
Vector
2
C3-01
Slip
Compensation
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
reference, 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 No A A A
Slip Comp Gain
C3-02
Slip
Compensation
Primary Delay
Time
This parameter adjusts the filter
on the output of the slip
compensation function. Increase
to add stability, decrease to
improve response.
• Reduce the setting when slip
compensation response is slow.
• When speed is not stabilized,
increase the setting.
0
to
10000
200ms
*
No A No A No No
Slip Comp
Time
C3-03
Slip
Compensation
Limit
This parameter sets the upper
limit for the slip compensation
function. It is set as a percentage
of motor rated slip (E2-02).
0
to
250
200% No A No A No No
Slip Comp
Limit
C3-04
Slip
Compensation
Selection
During
Regeneration
Determines whether slip
compensation is enabled or
disabled during regenerative
operation.
0: Disabled
1: Enabled
0 or 1 0 No A No A No No
Slip Comp
Regen
C3-05
Output Voltage
Limit Operation
Selection
Determines if the motor
magnetic flux is automatically
decreased when output voltage
saturation occurs.
0: Disabled
1: Enabled
0 or 1 0 *1 No No No A A A
Output V limit
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