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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
Parameter
Number
Slip
Compensation
Gain
C3-01
Slip Comp Gain
Slip
Compensation
Primary Delay
Time
C3-02
Slip Comp
Time
Slip
Compensation
Limit
C3-03
Slip Comp
Limit
Slip
Compensation
Selection
During
C3-04
Regeneration
Slip Comp
Regen
Output Voltage
Limit Operation
Selection
C3-05
Output V limit
-32
6
* 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.
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Name
Description
Display
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.
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.
This parameter sets the upper
limit for the slip compensation
function. It is set as a percentage
of motor rated slip (E2-02).
Determines whether slip
compensation is enabled or
disabled during regenerative
operation.
0: Disabled
1: Enabled
Determines if the motor
magnetic flux is automatically
decreased when output voltage
saturation occurs.
0: Disabled
1: Enabled
Change
Setting
Factory
during
Range
Setting
V/f
Operation
0.0
to
1.0*
Yes
A
2.5
0
200ms
to
No
A
*
10000
0
to
200%
No
A
250
0 or 1
0
No
A
0 or 1
0 *1
No
No
Control Methods
Open
Open
V/f
Loop
Flux
Loop
with
Vector
Vector
Vector
PG
1
2
No
A
A
A
No
A
No
No
No
A
No
No
No
A
No
No
No
A
A
A
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Troubleshooting
